Develop Reference

Android Widget freezes after some time

I have made a counter widget. There are two buttons, one to increase and one to decrease the number. The number is displayed on a TextView. At first everything works just fine, but after some time (usually around an hour) the Textview freezes i.e. I click the buttons but the number doesen't change.
When I click the buttons, the "clicking animation" is still played, so the buttons might still work.
When I remove the widget and replace it again, the widget starts to work again but the same problem occurs after around the same time.
The code is here:
WidgetProvider
package com.example.myapplication;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.RemoteViews;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class WidgetProvider1 extends AppWidgetProvider {
String widgettextviewtext;
final String INCREASE= "sdfjkldjldkf";
final String DECREASE = "skdhbcvouweoaior";
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
MainActivity.zahl = 15;
remoteViews.setTextViewText(R.id.textView, ""+MainActivity.zahl);
remoteViews.setOnClickPendingIntent(R.id.button3,onClickPendingIntent(context,ZAHLGROESSER) );
remoteViews.setOnClickPendingIntent(R.id.button2,onClickPendingIntent(context,ZAHLKLEINER) );
appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
updateWidgetNow(context,remoteViews);
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
#Override
public void onReceive(Context context, Intent intent) {
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
//if increase button is clicked
if(intent.getAction().equals(INCREASE)){
if(MainActivity.zahl == 15) {
Toast.makeText(context, "STOOOP!!!", Toast.LENGTH_SHORT).show();
}else{
MainActivity.number = MainActivity.number+1;
String text=""+ MainActivity.number;
remoteViews.setTextViewText(R.id.textView, text);
updateWidgetNow(context, remoteViews);
}
}
//if decrease button is clicked
if(intent.getAction().equals(DECREASE)) {
if (MainActivity.number == 0) {
Toast.makeText(context, "Hurray!", Toast.LENGTH_SHORT).show();
}else{
MainActivity.number = MainActivity.number - 1;
String text = "" + MainActivity.number;
remoteViews.setTextViewText(R.id.textView, text);
updateWidgetNow(context, remoteViews);
}
}
super.onReceive(context, intent);
}
public void updateWidgetNow (Context context, RemoteViews remoteViews){
ComponentName widgetComponent = new ComponentName(context, WidgetProvider1.class);
AppWidgetManager.getInstance(context).updateAppWidget(widgetComponent, remoteViews);
}
public PendingIntent onClickPendingIntent (Context context, String stringAction){
Intent onClickIntent = new Intent(context, WidgetProvider1.class);
onClickIntent.setAction(stringAction);
return PendingIntent.getBroadcast(context,0,onClickIntent,PendingIntent.FLAG_UPDATE_CURRENT);
}
}
MainActivity:
package com.example.myapplication;
import android.appwidget.AppWidgetManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
public static int number = 15;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.myapplication">
<uses-permission android:name="android.permission.VIBRATE"/>
<application
android:allowBackup="true"
android:dataExtractionRules="#xml/data_extraction_rules"
android:fullBackupContent="#xml/backup_rules"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.MyApplication"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true"
android:label="#string/app_name"
android:theme="#style/Theme.MyApplication">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.example.myapplication.WidgetProvider1"
android:label="Tutorial Widget"
android:exported="true"
>
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="#xml/widget_info"
/>
</receiver>
</application>
</manifest>
WidgetInfo:
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
xmlns:android="http://schemas.android.com/apk/res/android"
android:minHeight="180dp"
android:minWidth="180dp"
android:initialLayout="#layout/widget_layout"
android:previewImage="#drawable/widget_preview"
android:widgetCategory="home_screen"
android:resizeMode="horizontal|vertical"
>
</appwidget-provider>
WidgeLayout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:theme="#style/Theme.AppCompat.Light"
android:id="#+id/widget_layout"
>
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="220dp"
android:layout_centerInParent="true"
android:text="1"
android:textAlignment="center"
android:textSize="150dp"
android:textColor="#color/white"
/>
<Button
android:id="#+id/button3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/textView"
android:layout_marginBottom="1dp"
android:text="increase"
android:bottomRightRadius="20dp"
android:bottomLeftRadius="20dp"
android:topLeftRadius="20dp"
android:topRightRadius="20dp"
android:textSize="30dp"
/>
<Button
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/textView"
android:layout_marginTop="1dp"
android:text="decrease"
android:bottomRightRadius="20dp"
android:bottomLeftRadius="20dp"
android:topLeftRadius="20dp"
android:topRightRadius="20dp"
android:textSize="30dp"
/>
</RelativeLayout>

how can i play sound in android

I wrote simplw android program to play sound and it's not working . Have no idea why .
maybe it's related to the fact that i have question mark near mymp3 file ( under raw directory ).
I tried few options without any suseess .
Attached below is my code , thanks in advance .
xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:background="#CFEC89"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:layout_width="200dp"
android:layout_height="80dp"
android:id="#+id/sound"
android:layout_marginTop="1dp"
android:layout_marginBottom="1dp"
android:layout_marginLeft="1dp"
android:layout_marginRight="1dp"
android:layout_gravity="center"
android:text="Sound"
android:textSize="30sp"
android:background="#EAE3E3"
/>
</LinearLayout>
main acitivy java
package com.example.playsound;
import androidx.appcompat.app.AppCompatActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
// define my variables
Button sound;
final MediaPlayer mp = MediaPlayer.create(this,R.raw.cat);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public void onClick(View v)
{
mp.start();
}
}
and my manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.playsound">
<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/Theme.PlaySound">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

First of all, delete your TextView it could lay over your Button. That's why you probably can't click it.
Paste that in your class:
package com.example.playsound;
import androidx.appcompat.app.AppCompatActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MediaPlayer mp = MediaPlayer.create(this, R.raw.cat);
final Button sound = (Button) this.findViewById(R.id.sound);
sound.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mp.start();
}
});
}
}
For the future, you need to define your variables in the OnCreate and not above.

Why Isn't the Button responding to the Intent? Don't understand what's wrong here

I am trying to get the ABOUT button to listen for a click, in order to go from a screen displaying three buttons and a picture, to another screen just displaying some text.
This is my Main java file (MainActivity.java)
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
public void addListenerOnButton() {
final Context cont = this;
Button aButton = (Button) findViewById(R.id.ab_button);
aButton.setOnClickListener(
new Button.OnClickListener(){
public void onClick(View v){
Intent intent = new Intent(cont, AboutActivity.class);
startActivity(intent);
}
});
}
This is my second java file for the about button (AboutActivity.java):
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class AboutActivity extends Activity {
public void onCreate(Bundle about){
super.onCreate(about);
setContentView(R.layout.activity_about);
TextView briText = (TextView) findViewById(R.id.about_b2);
briText.setText("Goodie");
}
}
This is the main xml file that displays the picture and the buttons (activity_main.xml):
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/about_b"
android:id="#+id/ab_button"
android:shadowColor="#8e2300"
android:background="#drawable/oval_button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/share_button"
android:id="#+id/share_button"
android:shadowColor="#8e2300"
android:onClick="shareActivity"
android:background="#drawable/oval_button"
And this is the xml file that displays the text (activity_about.xml):
<RelativeLayout 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" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:id="#+id/back_to_work_rel">
<TextView android:text="#string/about_bac"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/about_b2" />
</RelativeLayout>
Manifest file (AndroidManifest.xml):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.brian.eggalong" >
<application
android:allowBackup="true"
android:icon="#mipmap/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=".AboutActivity"
android:parentActivityName=".MainActivity"
android:label="#string/about_bac">
</activity>
</application>
</manifest>
Every time I click the ABOUT button, nothing happens. Any help would be greatly appreciated.

Try to remove the background attribute of your button.
Otherwise you can try this
MainActivity.java
public void moveToAboutActivity(){
Intent i = new Intent(getApplicationContext(), AboutActivity.class);
startActivity(i);
}
activity_main.xml
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/about_b"
android:id="#+id/ab_button"
android:onClick="moveToAboutActivity"/>
good Luck

Ok, so, definetly the problem is that you need to put the activity in your manifest file like:
<activity
android:name=".activity.SplashScreen"
android:screenOrientation="portrait"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Bluetooth adapter is remaining null in android

I have a problem while writing code of bluetooth adapter in android. Bluetooth adapter is always remains null. I have written code for that but I could not turn on the bluetooth.
My Code is as below
package com.example.bluetoothdemo;
import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
#SuppressLint("NewApi")
public class MainActivity extends Activity {
String msg="Hello";/* Default message to be sent. */
BluetoothAdapter adpt=null;// Default it is set to null value.
public static String MacAddress;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn=(Button)findViewById(R.id.button_send);
final TextView tv=(TextView)findViewById(R.id.disp_msg);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
adpt=BluetoothAdapter.getDefaultAdapter();
if(adpt==null){
// Always this portion is generating errors.
tv.append("Bluetooth Not Available in device");
Toast.makeText(getApplicationContext(), "Bluetooth is off",Toast.LENGTH_LONG).show();
}
else{
if(!adpt.isEnabled()){
//adpt.enable();
Intent i=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
//startActivity(i);
startActivityForResult(i, 0);
tv.append("Bluetooth is turned on.");
}
}
byte[] toSend=msg.getBytes();
try{
final UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
BluetoothDevice device=adpt.getRemoteDevice(MacAddress);
BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
socket.connect();
OutputStream mmout=socket.getOutputStream();
mmout.write(toSend);
mmout.flush();
mmout.close();
socket.close();
Toast.makeText(getBaseContext(), MacAddress, Toast.LENGTH_SHORT).show();
}catch(IOException e){
e.printStackTrace();
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
My activity_main.xml file is as below:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button android:id="#+id/button_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage" />
<TextView android:id="#+id/disp_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/display"
/>
</LinearLayout>
My AndroidMenifest.xml file is as below:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.bluetoothdemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.bluetoothdemo.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>
</application>
</manifest>-
I have created the .apk file also and run on my Micromax A89 Ninja phone but the error says that "BluetoothDemo has been stopped unexpectedly."

Please write the below line
adpt=BluetoothAdapter.getDefaultAdapter();
in OnCreate() method after this line,
setContentView(R.layout.activity_main);

Action listner not working on image in android with draglayout

My xml code :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.my_slide_menu"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.my_slide_menu.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>
</application>
</manifest>
And java file
package com.example.my_slide_menu;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.support.v4.widget.DrawerLayout;
import android.content.res.Configuration;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.MenuItem;
public class MainActivity extends Activity {
private DrawerLayout drawlayout = null;
ImageView arrow;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
System.out.println("On create");
// drawlayout=(DrawerLayout)findViewById(R.id.drawer_layout);
arrow = (ImageView) findViewById(R.id.arrow);
// getSupportActionBar().setHomeButtonEnabled(true);
// getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// getSupportActionBar().setDisplayShowHomeEnabled(true);
// getSupportActionBar().setDisplayShowTitleEnabled(true);
arrow.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
System.out.println("Touch");
return false;
}
});
}
}
How solve this Proplem.
I want when click on image slider open.But action listner not work on image.
Without drwer click listner working.
I am making a slider menu like face book.
Please help me
My layout file is
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/arrow"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_centerHorizontal="true"
android:src="#drawable/a" />
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ListView
android:id="#+id/listview_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#111"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp" />
</android.support.v4.widget.DrawerLayout>
</RelativeLayout>

Set arrow as ImageButton or add:
android:clickable="true" android:focusable="true"
Hope it helps