Develop Reference

I'm trying to add Splash Screen to my app

I have been trying to implement splash Screen to my app with help of many codes avaible in sites , but none worked for me.
Each time the app is crashing after displaying splash screen for 3 secs.
I don't know where i'm going wrong , please make corrections to my code to display splash screen correctly ! Thank You !
//This is my Main activity
1. public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button one = (Button) this.findViewById(R.id.gg);
final MediaPlayer mp1 = MediaPlayer.create(this, R.raw.gg);
one.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Good Game", Toast.LENGTH_SHORT).show();
mp1.start();
}
});
Button two = (Button) this.findViewById(R.id.gm);
final MediaPlayer mp2 = MediaPlayer.create(this, R.raw.gm);
two.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Oh, They got me!", Toast.LENGTH_SHORT).show();
mp2.start();
}
});
Button three = (Button) this.findViewById(R.id.cb);
final MediaPlayer mp3 = MediaPlayer.create(this, R.raw.cb);
three.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Come on boy", Toast.LENGTH_SHORT).show();
mp3.start();
}
});
Button four = (Button) this.findViewById(R.id.ns);
final MediaPlayer mp4 = MediaPlayer.create(this, R.raw.ns);
four.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Nice shot", Toast.LENGTH_SHORT).show();
mp4.start();
}
});
Button five = (Button) this.findViewById(R.id.wp);
final MediaPlayer mp5 = MediaPlayer.create(this, R.raw.wp);
five.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "You wanna piece of me!", Toast.LENGTH_SHORT).show();
mp5.start();
}
});
Button six = (Button) this.findViewById(R.id.bi);
final MediaPlayer mp6 = MediaPlayer.create(this, R.raw.bi);
six.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Bring it", Toast.LENGTH_SHORT).show();
mp6.start();
}
});
Button seven = (Button) this.findViewById(R.id.lg);
final MediaPlayer mp7 = MediaPlayer.create(this, R.raw.lg);
seven.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Let’s go, Yeah!", Toast.LENGTH_SHORT).show();
mp7.start();
}
});
Button eight = (Button) this.findViewById(R.id.ru);
final MediaPlayer mp8 = MediaPlayer.create(this, R.raw.ru);
eight.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Ready Up", Toast.LENGTH_SHORT).show();
mp8.start();
}
});
Button nine = (Button) this.findViewById(R.id.nn);
final MediaPlayer mp9 = MediaPlayer.create(this, R.raw.nn);
nine.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Nooooo", Toast.LENGTH_SHORT).show();
mp9.start();
}
});
Button ten = (Button) this.findViewById(R.id.cm);
final MediaPlayer mp10 = MediaPlayer.create(this, R.raw.cm);
ten.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Cover me", Toast.LENGTH_SHORT).show();
mp10.start();
}
});
Button eleven = (Button) this.findViewById(R.id.hh);
final MediaPlayer mp11 = MediaPlayer.create(this, R.raw.hh);
eleven.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Hoo-ya", Toast.LENGTH_SHORT).show();
mp11.start();
}
});
Button twelve = (Button) this.findViewById(R.id.mo);
final MediaPlayer mp12 = MediaPlayer.create(this, R.raw.mo);
twelve.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Move out", Toast.LENGTH_SHORT).show();
mp12.start();
}
});
Button thirteen = (Button) this.findViewById(R.id.gs);
final MediaPlayer mp13 = MediaPlayer.create(this, R.raw.gs);
thirteen.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Get Some", Toast.LENGTH_SHORT).show();
mp13.start();
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Your Messege",Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
//This is my activity_main.xml
2. <android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.android.mmm.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/fab_margin"
app:layout_anchor="#id/app_bar"
app:layout_anchorGravity="bottom|end"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
//This is content_main.xml
3. <android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.android.mmm.MainActivity"
tools:showIn="#layout/activity_main">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000000">
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="GG"
android:id="#+id/gg"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:id="#+id/gm"
android:layout_width="100dp"
android:layout_height="48dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="16dp"
android:text="GM"
android:textAllCaps="true"
android:textColor="#000000"
android:textSize="18sp"
android:textStyle="bold"
tools:ignore="HardcodedText" />
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="CB"
android:id="#+id/cb"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="NS"
android:id="#+id/ns"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="WP"
android:id="#+id/wp"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="BI"
android:id="#+id/bi"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="LG"
android:id="#+id/lg"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="RU"
android:id="#+id/ru"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="NN"
android:id="#+id/nn"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="CM"
android:id="#+id/cm"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="HH"
android:id="#+id/hh"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="MO"
android:id="#+id/mo"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="100dp"
android:layout_height="48dp"
android:text="GS"
android:id="#+id/gs"
android:textSize="18sp"
android:textAllCaps="true"
android:textStyle="bold"
android:textColor="#000000"
tools:ignore="HardcodedText"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:layout_gravity="center_horizontal"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
//This is AndroidManifest.xml
4. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.mmm">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".SplashActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
</activity>
</application>
//This is styles.xml
5. <resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
//This is my SplashActivity.Java
public class SplashScreen extends Activity {
// Splash screen timer
private static int SPLASH_TIME_OUT = 3000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
new Handler().postDelayed(new Runnable() {
/*
* Showing splash screen with a timer. This will be useful when you
* want to show case your app logo / company
*/
#Override
public void run() {
// This method will be executed once the timer is over
// Start your app main activity
Intent i = new Intent(SplashScreen.this, MainActivity.class);
startActivity(i);
// close this activity
finish();
}
}, SPLASH_TIME_OUT);
}
}
6. //This is activity_splash.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/wwe_logo" />
</RelativeLayout>

AppCompatActivity has it's own toolbar so you need to remove it by using android:theme="#style/AppTheme.NoActionBar" in manifest
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
</activity>
Although if you are not doing much customization in your toolbar then your can also skip creating your own toolbar by removing it from XML and removing it's initialization from java code as well but by doing this , you will lose the feature of collapsing toolbar

Making a splash screen is actually pretty easy.
1. Create drawable
In my case, I created a drawable named splash.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
android:opacity="opaque">
<item android:drawable="#color/colorWhite" />
<item>
<bitmap
android:gravity="center"
android:src="#drawable/sensesmart_icon" />
</item>
2. Add drawable to your styles.xml
Here I just added my drawable to styles:
<style name="SplashTheme" parent="AppTheme">
<item name="android:windowBackground">#drawable/splash</item>
</style>
3. Add splash to manifest
You want to actually tell your app that the splash layout should show before the app has loaded:
<activity android:name=".BaseActivity"
android:screenOrientation="portrait"
android:theme="#style/SplashTheme"> <!--Splash screen-->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
4. Set theme on your starting activity
In my case, BaseActivity is the activity which starts my application, so inside my onCreate(), I start with setting my theme:
protected void onCreate(Bundle savedInstanceState) {
setTheme(R.style.AppTheme);
setContentView(R.layout.activity_base);
super.onCreate(savedInstanceState);
}
This is the only thing you need to do. If you use this method, the splash screen doesn't stay for longer than it needs. Your contentView will start as soon as you have loaded your app.
Hope this helps!

Change Password Activity

I have a problem in this app, it show me "Unfortunately, app has stopped"
MainActivity.class
package ahmedchtn.stockmanager;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText username;
EditText password;
Button loginbutton;
Button bpasschange;
int counter = 3;
String username_string ;
String password1 = "";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
username = (EditText) findViewById(R.id.identifer);
password = (EditText) findViewById(R.id.password);
loginbutton = (Button) findViewById(R.id.bLogin);
bpasschange = (Button) findViewById(R.id.bCh);
username_string = "admin";
if (password1 == "") {
password1 = "admin";
} else {
Intent intent4 = getIntent();
password1 = intent4.getStringExtra("oldpassw");
}
bpasschange.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intentoldpass = new Intent(MainActivity.this, PasswordChange.class);
intentoldpass.putExtra("oldpassw", password1);
Intent intentpasschan = new Intent(getApplicationContext(), PasswordChange.class);
startActivity(intentpasschan);
}
});
loginbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (username.getText().toString().equals(username_string) &&
password.getText().toString().equals(password1)) {
Toast.makeText(getApplicationContext(),
"Redirecting...", Toast.LENGTH_SHORT).show();
Intent iop = new Intent(getApplicationContext(), ManagementPage.class);
startActivity(iop);
} else {
Toast.makeText(getApplicationContext(),
"Wrong Entries", Toast.LENGTH_SHORT).show();
counter--;
if (counter == 0) {
loginbutton.setEnabled(false);
}
}
}
}
);
}
}
PasswordChange.class
package ahmedchtn.stockmanager;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class PasswordChange extends AppCompatActivity {
Button bchange;
EditText oldpassword;
EditText newpassword;
String oldpass;
String newpass;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_password_change);
bchange = (Button) findViewById(R.id.bChange2);
oldpassword = (EditText) findViewById(R.id.old_password);
newpassword = (EditText) findViewById(R.id.new_password);
bchange.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent ioldpass = getIntent();
oldpass = ioldpass.getStringExtra("oldpassw");
if (oldpass == (oldpassword.getText().toString())) {
newpass = newpassword.getText().toString();
Intent intentnew = new Intent(PasswordChange.this, MainActivity.class);
intentnew.putExtra("passnew", newpass);
startActivity(intentnew);
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
}
});
}
}
I think that the problem is with the intents..
Thanks in advance for your help !
Is there any other solutions
The logcat
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at ahmedchtn.stockmanager.MainActivity$2.onClick(MainActivity.java:46)
at android.view.View.performClick(View.java:4439)
at android.widget.Button.performClick(Button.java:139)
at android.view.View$PerformClick.run(View.java:18395)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5317)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Application terminated.
Xml Codes
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="ahmedchtn.stockmanager.MainActivity">
<EditText
android:id="#+id/identifer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:hint="#string/enter_your_id" />
<EditText
android:id="#+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:hint="#string/enter_your_password"
android:inputType="textPassword" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1">
<Button
android:id="#+id/bLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="#string/login" />
<Button
android:id="#+id/bCh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="changer passe" />
</LinearLayout>
</LinearLayout>
activity_password_change.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_password_change"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="ahmedchtn.stockmanager.PasswordChange">
<EditText
android:id="#+id/old_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:hint="#string/enter_your_old_password" />
<EditText
android:id="#+id/new_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:hint="#string/enter_your_new_password" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="#dimen/activity_vertical_margin"
android:weightSum="1">
<Button
android:id="#+id/bChange2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:layout_weight="0.5"
android:text="#string/confirm" />
<Button
android:id="#+id/main_page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:layout_weight="0.5"
android:text="#string/main_page" />
</LinearLayout>
</LinearLayout>
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ahmedchtn.stockmanager">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ManagementPage"
android:parentActivityName=".MainActivity" />
<activity android:name=".ProductsSearch" />
<activity android:name=".ProductsCommand" />
<activity
android:name=".Editor"
android:parentActivityName=".ProductsList" />
<activity android:name=".ProductsList" />
<provider
android:name=".data.ProductProvider"
android:authorities="ahmedchtn.stockmanager"
android:exported="false" />
<activity android:name=".PasswordChange"></activity>
</application>
</manifest>
I have updated my code

From the information you've provided so far (NPE on line 28 of PasswordChange.class), it looks like this line is causing the issue:
bchange = (Button) findViewById(R.id.bChange);
bchange.setOnClickListener(new View.OnClickListener() {
...
You have a button named bChange in both of your layout xml files - change one of them into something unique. I highly recommend that all components should be uniquely named through the app, as that stops the possibility of an activity accidentally referencing the wrong resource.
Example:
activity_password_change.xml
...
<Button
android:id="#+id/bPasswordChange"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_vertical_margin"
android:layout_weight="0.5"
android:text="#string/confirm" />
...
PasswordChange.java
...
bchange = (Button) findViewById(R.id.bPasswordChange);
...
For the second issue that's arisen in MainActivity.java:
Intent intentbool = getIntent();
bmain = intentbool.getBooleanExtra("bool", bmain);
However, your problem here lies with line 20:
Boolean bmain;
Because you've declared a Boolean object rather than a boolean primitive (note the capital B), it is null by default as you've not initialised it. Change it to a primitive:
boolean bmain;

Make sure you have defined PasswordChange.class in your Manifest.xml file.
An example would be <activity android:name=".PasswordChange"/>. That's the most common reason for an app to crash when going to a new activity.

buttons inside the drawerLayout dont work

I have problem with drawerLayout. in drawerLayout, i have two Linearlayouts. one is the main menu that shows directly, the otherone is active with drawer slide. when i slide the drawer menü i cant click the buttons. but when i remove the second linearLayout then the buttons in the drawer work. how can i solve it?
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=""
android:clickable="true"
android:contextClickable="true">
<LinearLayout
android:orientation="vertical"
android:layout_gravity="left|start"
android:background="#color/list_back"
android:layout_width="250dp"
android:layout_height="match_parent"
android:onClick="setContentView"
android:contextClickable="true"
android:clickable="true">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ana Sayfa"
android:id="#+id/buttonAnaSayfa"
android:onClick="setContentView"
android:clickable="false"
android:contextClickable="false"
android:nestedScrollingEnabled="false" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Kalori Tablosu"
android:id="#+id/buttonKalori"
android:onClick="setContentView"
android:clickable="true"
android:contextClickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Glisemik İndeks Tablosu"
android:id="#+id/buttonGITablosu"
android:onClick="setContentView"
android:clickable="true"
android:contextClickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Vücut Kütle İndeksi"
android:id="#+id/buttonVucutKutle"
android:onClick="setContentView"
android:clickable="true"
android:contextClickable="true" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foregroundGravity="center">
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonKaloriListesi"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:src="#drawable/kalori_listesi_button"
android:background="#null"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonGITablosu"
android:src="#drawable/gi_tablosu_button"
android:layout_below="#+id/imageButtonKaloriListesi"
android:layout_alignParentStart="true"
android:background="#null"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonBugunKaloriHesabi"
android:src="#drawable/bugun_kac_kalori_aldin_button"
android:background="#null"
android:layout_above="#+id/imageButtonVucutKutleIndeks"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonVucutKutleIndeks"
android:src="#drawable/vucut_kutle_indeksi_button"
android:background="#null"
android:layout_centerVertical="true"
android:layout_alignStart="#+id/imageButtonBugunKaloriHesabi"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="test"
android:id="#+id/buttontest1"
android:layout_gravity="center_horizontal" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="230dp"
android:layout_gravity="center_horizontal"
android:id="#+id/ad"
android:layout_marginTop="40dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"></LinearLayout>
</LinearLayout>
here is my .java ;
package com.azelirbrevo.glisemikindeks
public class "" extends AppCompatActivity {
//DrawerLayout drawerLayout;
//ActionBarDrawerToggle toggle;
//CharSequence actionBarTitle, appTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.firstaftersplash);
ImageButton ImageButtonKaloriListesi = (ImageButton) findViewById(R.id.imageButtonKaloriListesi);
ImageButton imageButtonGITablosu = (ImageButton) findViewById(R.id.imageButtonGITablosu);
ImageButton imageButtonVucutKutleIndeks = (ImageButton) findViewById(R.id.imageButtonVucutKutleIndeks);
ImageButton imageButtonBugunKaloriHesabi = (ImageButton) findViewById(R.id.imageButtonBugunKaloriHesabi);
ImageButtonKaloriListesi.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(firstAfterSplash.this, KaloriListesi.class);
startActivity(intent);
}
});
imageButtonGITablosu.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(firstAfterSplash.this, GITablosu.class);
startActivity(intent);
}
});
imageButtonVucutKutleIndeks.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(firstAfterSplash.this, VucutKutleIndexHesaplama.class);
startActivity(intent);
}
});
imageButtonBugunKaloriHesabi.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(firstAfterSplash.this, bugunKacKaloriAldim.class);
startActivity(intent);
}
});
//drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
//actionBarTitle = appTitle = getSupportActionBar().getTitle();
Button buttonAnasayfa = (Button) findViewById(R.id.buttonAnaSayfa);
Button buttonKalori = (Button) findViewById(R.id.buttonKalori);
Button buttonGı = (Button) findViewById(R.id.buttonGITablosu);
Button buttonVucutKutle = (Button) findViewById(R.id.buttonVucutKutle);
Button test = (Button) findViewById(R.id.buttontest1);
test.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(firstAfterSplash.this, TEST.class);
startActivity(intent);
}
});
buttonAnasayfa.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "tiklandi", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(firstAfterSplash.this, GITablosu.class);
startActivity(intent);
}
});
buttonKalori.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "tiklandi", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(firstAfterSplash.this, GITablosu.class);
startActivity(intent);
}
});
buttonGı.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "tiklandi", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(firstAfterSplash.this, GITablosu.class);
startActivity(intent);
}
});
buttonVucutKutle.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "tiklandi", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(firstAfterSplash.this, GITablosu.class);
startActivity(intent);
}
});
}}
this is the design

You can create a application with Navigation drawer Activity here you can see custom layout inside drawer layout and inside layout you can set any type of widgets as button, TextView and any type what ever you want.

In xml file, my drawer menu items (LinearLayout and Buttons) were over my main LinearLayout. I just cut-paste it under the main LinearLayout and it helped.
here is the updated xml file of my project, hope will help someone.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=""
android:clickable="true"
android:contextClickable="true">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foregroundGravity="center">
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonKaloriListesi"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:src="#drawable/kalori_listesi_button"
android:background="#null"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonGITablosu"
android:src="#drawable/gi_tablosu_button"
android:layout_below="#+id/imageButtonKaloriListesi"
android:layout_alignParentStart="true"
android:background="#null"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonBugunKaloriHesabi"
android:src="#drawable/bugun_kac_kalori_aldin_button"
android:background="#null"
android:layout_above="#+id/imageButtonVucutKutleIndeks"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<ImageButton
android:layout_width="360dp"
android:layout_height="wrap_content"
android:id="#+id/imageButtonVucutKutleIndeks"
android:src="#drawable/vucut_kutle_indeksi_button"
android:background="#null"
android:layout_centerVertical="true"
android:layout_alignStart="#+id/imageButtonBugunKaloriHesabi"
android:layout_marginTop="10dp"
android:foregroundGravity="center"
android:gravity="center"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="230dp"
android:layout_gravity="center_horizontal"
android:id="#+id/ad"
android:layout_marginTop="40dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"></LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_gravity="left|start"
android:layout_width="250dp"
android:layout_height="match_parent"
android:onClick="setContentView"
android:contextClickable="true"
android:clickable="true"
android:background="#85c7f1">
<Button
android:layout_width="fill_parent"
android:layout_height="50dp"
android:id="#+id/ButtonDrawerAnaSayfa"
android:background="#null"
android:layout_gravity="left"
android:gravity="left"/>
<Button
android:layout_width="fill_parent"
android:layout_height="50dp"
android:id="#+id/ButtonDrawerKalori"
android:background="#null"
android:layout_gravity="left"
android:gravity="left"/>
<Button
android:layout_width="fill_parent"
android:layout_height="50dp"
android:id="#+id/ButtonDrawerGI"
android:background="#null"
android:layout_gravity="left"
android:gravity="left"/>
<Button
android:layout_width="fill_parent"
android:layout_height="50dp"
android:id="#+id/ButtonDrawerVucutKutle"
android:background="#null"
android:layout_gravity="left"
android:gravity="left"/>
</LinearLayout>

onclick not working after starting another activity

I have two Activities MainActivity and Register when i intent from MainActivity to Register the button listener in Register class is not working.
Here is the code
MainActivity
public class MainActivity extends AppCompatActivity {
// defining all the components
AlertDialog builder;
public EditText Email,Password;
public ImageButton fb,twitter;
public Button register;
public String email;
public String password;
public BackgroungWorker backgroungWorker;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
builder = new AlertDialog.Builder(this).create();
setContentView(R.layout.activity_main);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
getSupportActionBar().hide();
Email= (EditText) findViewById(R.id.email);
Password= (EditText) findViewById(R.id.pass);
fb= (ImageButton) findViewById(R.id.fb_button);
twitter= (ImageButton) findViewById(R.id.tw_button);
register = (Button) findViewById(R.id.register);
}
// for listening to the events
public void eventHappend(View view)
{
if(view.getId()==R.id.login)
{
email = Email.getText().toString();
password = Password.getText().toString();
if(email.equals(""))
{
showMessage("Error","Email cannot be blank");
return;
}
if(password.equals(""))
{
showMessage("Error","Enter your password");
return;
}
backgroungWorker = new BackgroungWorker(this);
backgroungWorker.execute("Login",email,password);
}
if(view.getId()==R.id.register)
{
// INTENT TO REGISTER ACTIVITY
Intent intent = new Intent(MainActivity.this,Register.class);
startActivity(intent);
}
if(view.getId()==R.id.forgot)
{
}
if(view.getId()== R.id.fb_button)
{
showToast("Facebook!!");
}
if(view.getId()==R.id.tw_button)
{
showToast("Twitter");
}
}
public void showToast(String s)
{
Toast toast = new Toast(this);
toast.makeText(this,s, Toast.LENGTH_SHORT).show();
}
public void showMessage(String title,String message)
{
builder.setTitle(title);
builder.setMessage(message);
builder.setCancelable(true);
builder.show();
}}
Register
public class Register extends Activity {
String user_name,pass,confim_password,email;
AlertDialog builder;
private EditText name,mail,password,confirm_pass;
private Button register;
private BackgroungWorker backgroungWorker;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
mail = (EditText) findViewById(R.id.email);
name = (EditText) findViewById(R.id.name);
password = (EditText) findViewById(R.id.pass);
confirm_pass= (EditText) findViewById(R.id.confirmpass);
register = (Button) findViewById(R.id.register_btn);
builder = new AlertDialog.Builder(this).create();
}
public void registerClicked(View view) // this is not working
{
if(view.getId()==R.id.register_btn)
{
if(name.getText().equals(""))
{
showMessage("Error","Name Cannot be left blank");
return;
}
if(mail.getText().equals(""))
{
showMessage("Error","Email Cannot be left blank");
return;
}
if(password.getText().equals(""))
{
showMessage("Error","Password Cannot be left blank");
return;
}
if(password.getText().equals(confirm_pass.getText().toString()))
{
backgroungWorker = new BackgroungWorker(this);
backgroungWorker.execute("Register",name.getText().toString(),password.getText().toString(),mail.getText().toString());
}
}
}
public void showMessage(String title,String message)
{
builder.setTitle(title);
builder.setMessage(message);
builder.setCancelable(true);
builder.show();
}}
register.xml
`<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
android:background=
android:backgroundTint="#02b864">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="#02b864">
<ImageView
android:layout_width="212dp"
android:layout_height="176dp"
android:id="#+id/imageView"
android:layout_gravity="center_horizontal"
android:background="#drawable/splash"
android:layout_marginTop="20dp"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp">
<EditText
android:layout_width="wrap_content"
android:layout_height="50dp"
android:hint="Name"
android:id="#+id/name"
android:drawableLeft="#drawable/ic_username"
android:drawableTint="#color/colorPrimaryDark"
android:drawablePadding="#dimen/activity_vertical_margin"
android:focusable="true"
android:background="#drawable/editext_bg_gray"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp"
android:singleLine="true"
android:layout_marginTop="20dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="50dp"
android:hint="Email"
android:id="#+id/email"
android:drawableLeft="#drawable/ic_username"
android:drawableTint="#color/colorPrimaryDark"
android:drawablePadding="#dimen/activity_vertical_margin"
android:focusable="true"
android:background="#drawable/editext_bg_gray"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp"
android:singleLine="true"
android:layout_marginTop="5dp"
/>
<EditText
android:inputType="textPassword"
android:ems="10"
android:id="#+id/pass"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:hint="Password"
android:drawableLeft="#drawable/ic_pwd"
android:drawablePadding="#dimen/activity_horizontal_margin"
android:drawableTint="#color/colorPrimaryDark"
android:focusable="true"
android:background="#drawable/editext_bg_gray"
android:layout_gravity="center_horizontal"
android:layout_marginRight="25dp"
android:layout_marginLeft="25dp"
android:layout_marginTop="5dp"
android:singleLine="true" />
<EditText
android:inputType="textPassword"
android:ems="10"
android:id="#+id/confirmpass"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:hint="Confirm Password"
android:drawableLeft="#drawable/ic_pwd"
android:drawablePadding="#dimen/activity_horizontal_margin"
android:drawableTint="#color/colorPrimaryDark"
android:focusable="true"
android:background="#drawable/editext_bg_gray"
android:layout_gravity="center_horizontal"
android:layout_marginRight="25dp"
android:layout_marginLeft="25dp"
android:layout_marginTop="5dp"
android:singleLine="true" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/register_btn"
android:onClick="registerClicked"
android:clickable="true"
android:layout_gravity="center_horizontal"
android:background="#e5e7e8"
android:text="Register"
android:src="#drawable/editext_bg_gray"
android:textColor="#0fbb6c"
android:singleLine="true"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp"
android:layout_marginTop="50dp"
android:textStyle="normal"
android:textAlignment="center"
android:textSize="22dp"
/>
android:layout_gravity="center_horizontal" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>`
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.umarsafdar.dev96.chat">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".Splash"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Register"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN">
<category android:name="android.intent.category.DEFAULT" />
</action>
</intent-filter>
</activity>
</application>
</manifest>
thanks in advance.

Passing Radiobutton and Checkbox values to another activity

I am new to android. Here am trying to pass the radiobutton and Checkbox values from one activity to another activity. Its not showing any error but when I run it simply gets closed. Any help would be appreciated.Here I have posted the complete code..
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.RadioButton;
public class MainActivity extends Activity {
Intent obj = new Intent(this, SecondActivity.class);
Bundle extras = new Bundle();
RadioButton male, female, single, married;
CheckBox twelveth, bE, mE;
String s1="+2";
String s2="B.E.";
String s3="M.E.";
StringBuilder s;
String str;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
male = (RadioButton) findViewById(R.id.male);
female = (RadioButton) findViewById(R.id.female);
single = (RadioButton) findViewById(R.id.single);
married = (RadioButton) findViewById(R.id.married);
twelveth = (CheckBox) findViewById(R.id.twelveth);
bE = (CheckBox) findViewById(R.id.BE);
mE = (CheckBox) findViewById(R.id.ME);
str=s.toString();
extras.putString("Education",str);
}
public void onGenderClicked(View v) {
boolean checked = ((RadioButton) v).isChecked();
switch (v.getId()) {
case R.id.male:
if (checked)
extras.putString("Gender", "Male");
break;
case R.id.female:
if (checked)
extras.putString("Gender", "Female");
break;
}
}
public void onStatusClicked(View v) {
boolean checked = ((RadioButton) v).isChecked();
switch (v.getId()) {
case R.id.single:
if (checked)
extras.putString("Status", "Single");
break;
case R.id.married:
if (checked)
extras.putString("Status", "Married");
break;
}
}
public void ButtonClick(View v) {
obj.putExtras(extras);
startActivity(obj);
}
public void onCheckBoxClicked(View v)
{
boolean checked=((CheckBox)v).isChecked();
switch(v.getId())
{
case R.id.twelveth:
if(checked)
{
s.append("\n"+s1);
}
break;
case R.id.BE:
if(checked)
{
s.append("\n"+s2);
}
break;
case R.id.ME:
if(checked)
{
s.append("\n"+s3);
}
break;
}
str=s.toString();
extras.putString("Education",str);
}
}
SecondActivity
package com.example.aravindpraveen.buttonsandboxes;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class SecondActivity extends Activity {
TextView tvGender,tvStatus,tvEducation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
tvGender=(TextView)findViewById(R.id.tvGender);
tvStatus=(TextView)findViewById(R.id.tvStatus);
tvEducation=(TextView)findViewById(R.id.tvEducation);
Intent obj1=getIntent();
Bundle extras=obj1.getExtras();
String gender=extras.getString("Gender");
String status=extras.getString("Starus");
String education=extras.getString("Education");
tvGender.setText(gender);
tvStatus.setText(status);
tvEducation.setText(education);
}
}
Android Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.aravindpraveen.buttonsandboxes" >
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SecondActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="#6457d962"
android:orientation="vertical">
<TextView android:text="#string/b_b"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textSize="40sp"
android:background="#f62dd93c"
android:textColor="#c34c27e6"
android:gravity="center"/>
<Space
android:layout_width="match_parent"
android:layout_height="15dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/gender"
android:textSize="40sp"
android:gravity="center"
android:textColor="#000000"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/rg_gender">
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/male"
android:text="#string/male"
android:textSize="30sp"
android:checked="true"
android:onClick="onGenderClicked"/>
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/female"
android:text="#string/female"
android:textSize="30sp"
android:onClick="onGenderClicked"/>
</RadioGroup>
<Space
android:layout_width="match_parent"
android:layout_height="15dp"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="40sp"
android:text="#string/M_status"
android:textColor="#000000"
android:gravity="center"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/rg_status">
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/single"
android:text="#string/single"
android:textSize="30sp"
android:checked="true"
android:onClick="onStatusClicked"/>
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/married"
android:text="#string/married"
android:textSize="30sp"
android:onClick="onStatusClicked"/>
</RadioGroup>
<Space
android:layout_width="match_parent"
android:layout_height="15dp"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="40sp"
android:text="#string/education"
android:textColor="#000000"
android:gravity="center"
/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/twelveth"
android:textSize="30sp"
android:id="#+id/twelveth"
android:onClick="onCheckBoxClicked"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/bE"
android:textSize="30sp"
android:id="#+id/BE"
android:onClick="onCheckBoxClicked"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/mE"
android:textSize="30sp"
android:id="#+id/ME"
android:onClick="onCheckBoxClicked"/>
<Button
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="#+id/submit"
android:text="#string/submit"
android:layout_gravity="center"
android:onClick="ButtonClick"/>
</LinearLayout>
second.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f4dbde"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="40sp"
android:background="#fba1a1"
android:text="#string/heading"
android:gravity="center"
android:textColor="#ffffff"/>
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/gender"
android:textSize="40sp"
android:gravity="center"
android:textColor="#ffffff"
android:background="#f7beae"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:paddingTop="20dp"
android:gravity="center"
android:id="#+id/tvGender"/>
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/M_status"
android:textSize="40sp"
android:gravity="center"
android:textColor="#ffffff"
android:background="#f7beae"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:paddingTop="20dp"
android:gravity="center"
android:id="#+id/tvStatus"/>
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/education"
android:textSize="40sp"
android:gravity="center"
android:textColor="#ffffff"
android:background="#f7beae"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:paddingTop="20dp"
android:gravity="center"
android:id="#+id/tvEducation"/>
</LinearLayout>
LogCat
02-03 11:39:42.859 1135-1135/com.example.aravindpraveen.buttonsandboxes D/AndroidRuntime﹕ Shutting down VM
02-03 11:39:42.863 1135-1135/com.example.aravindpraveen.buttonsandboxes W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa4c2c648)
02-03 11:39:42.899 1135-1135/com.example.aravindpraveen.buttonsandboxes E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.aravindpraveen.buttonsandboxes/com.example.aravindpraveen.buttonsandboxes.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getPackageName(ContextWrapper.java:135)
at android.content.ComponentName.<init>(ComponentName.java:75)
at android.content.Intent.<init>(Intent.java:3662)
at com.example.aravindpraveen.buttonsandboxes.MainActivity.<init>(MainActivity.java:15)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1130)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

from the second activity declare in Manifest, remove tags
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
i think starting activity as MAIN while it's not MAIN may cause this problem
also in documentaion
Activity Action: Start as a main entry point, does not expect to receive data.
EDIT:
also move
str=s.toString();
extras.putString("Education",str);
inside onClick that starts the 2nd activity