I have a problem by following a tutorial for making an app. But now I get an error by adding an respond
for a button. It gives an error at public void sendMessage, but I cant see what is wrong.
package com.example.myfirstapp;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Intent;
/** Called when the user clicks the Send button */
public void sendMessage(View view){
Intent intent = new Intent(this, DisplayMessageActivity.class);
}
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
those lines
/** Called when the user clicks the Send button */
public void sendMessage(View view){
Intent intent = new Intent(this, DisplayMessageActivity.class);
}
go into your class, after
public class MainActivity extends ActionBarActivity {
Your function is outside the activity.
Move
public void sendMessage(View view){
Intent intent = new Intent(this, DisplayMessageActivity.class);
}
inside Activity like this:
public class MainActivity extends ActionBarActivity {
//other code i.e. onCreate etc
public void sendMessage(View view){
Intent intent = new Intent(this, DisplayMessageActivity.class);
}
}
Related
For a school project I am creating a simple app. However, I run into one problem to finalize the app.
I've been trying to make two buttons on my main layout. The buttons are supposed to open a second layout, one called barcode_scanner.xml and another called vragen.xml
However, only the first button opens the scanner. The second button does not do anything.
This is my current code from MainActivity.java
package com.kvprasad.zbarbarcodescanner;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Button scannerButton;
#Override
//Barcodescanner knop
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button next = (Button) findViewById(R.id.scannerButton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), BarcodeScanner.class);
startActivityForResult(myIntent, 0);
}
});
}
#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);
}
public class bovenbouw extends MainActivity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button next = (Button) findViewById(R.id.bovenbutton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), Vragen.class);
startActivityForResult(myIntent, 0);}});}}}
I don't see any problems in the code. What am I possibly doing wrong?
Thank you.
Do not make multiple onCreate methods for the same activity. Handle all your button clicks in the same onCreate method. What you can do is this:
package com.kvprasad.zbarbarcodescanner;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Button scannerButton;
#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);
}
#Override
//Barcodescanner knop
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button next1 = (Button) findViewById(R.id.scannerButton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), BarcodeScanner.class);
startActivityForResult(myIntent, 0);
}
});
Button next2 = (Button) findViewById(R.id.bovenbutton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), Vragen.class);
startActivityForResult(myIntent, 0);}
});
}
}
You don't need 2 onCreate() methods for two buttons. As both of them are in the same layout, you can set onClickListener on both of them in one method only.
public class MainActivity extends AppCompatActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button next = (Button) findViewById(R.id.scannerButton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(this, BarcodeScanner.class);
startActivityForResult(myIntent, 0);
}
});
Button next1 = (Button) findViewById(R.id.bovenbutton);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(this, Vragen.class);
startActivityForResult(myIntent, 1);
//Make sure the second parameter is not 0, so that you can differentiate between them in onActivityReult method.
}
});
}
}
You don't have to create another class for vragen.class after bovenbutton is pressed.
just create another button for bovenbutton in the main class oncreate method besides the scanner_button
#Override
//Barcodescanner knop
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button next = (Button) findViewById(R.id.scannerButton);
Button vragen = (Button) findViewById(R.id.bovenbutton);//button for vragen
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), BarcodeScanner.class);
startActivityForResult(myIntent, 0);
}
});
//here goes the onclicklistener for vragen button
vragen.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), Vragen.class);
startActivityForResult(myIntent, 0);
}
});
}
You're not supposed to register two Activities in single .java file. You must create separate Activity.
package com.example.photosapp
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
}
So i got my firstScreen that i want to be shown just on the first app use.
and i have my mainActivity which will follow the firstScreen.
Im only starting with android and i don't want to use the solutions brought in here: How to launch activity only once when app is opened for first time? AND Can I have an android activity run only on the first time an application is opened? because i dont know SharedPreferrences yet.
So how can i achieve that using Boolean flags?
I have got:boolean firstTimeUse = false; In my firstScreenActivity
And when i start myMainActivity i set the flag to true;
firstTimeUse = true;
Intent intent = new Intent(FirstScreen.this,MainActivity.class);
startActivity(intent);
The problem is the MainActivity doesn't recognize the Boolean variable.
Am i doing it wrong? Or i can still make some modifications and do it with flags?
EDIT
FirstScreen.java:
package com.example.predesignedmails;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
public class FirstScreen extends AppCompatActivity
{
TextView welcomeTextTextView;
String welcomeText;
ImageButton goToMainImageButton;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first_screen);
viewsInitialization();
welcomeText = "Welcome to Pre Designed Mails.\n"
+ "In here you will have a tons of Emails templates for about every purpose you will need.\n"
+ "Just fill the small details and click Send.\n\n"
+ "Send E-mails fast and efficient!";
welcomeTextTextView.setText(welcomeText);
welcomeTextTextView.setMovementMethod(new ScrollingMovementMethod());
goToMainImageButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent = new Intent(FirstScreen.this,MainActivity.class);
startActivity(intent);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.first_screen, 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();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onResume()
{
super.onResume();
if (SettingsManager.getBoolean(this, SettingsManager.FIRST_LAUNCH, true))
{
SettingsManager.saveBoolean(this, SettingsManager.FIRST_LAUNCH, false);
// First launch code
Log.d("FirstLaunchCheckUp","First Launch");
}
}
private void viewsInitialization()
{
welcomeTextTextView = (TextView) findViewById(R.id.welcome_text_text_view_id);
goToMainImageButton = (ImageButton) findViewById(R.id.go_to_main_button_id);
}
}
The onResume() method i added manually. It wasn't added automatically when i crated a new activity in Eclipse.
MainActivity.java:
package com.example.predesignedmails;
import android.support.v7.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity
{
Button hatefullMailButton;
Button loveMailsButton;
Button welcomeScreenButton;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getWindow().getDecorView().setBackgroundColor(getResources().getColor(R.color.main_activity_background_color)); // Setting background color
viewsInitialization();
hatefullMailButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent = new Intent(MainActivity.this,HatefulMailsActivity.class);
startActivity(intent);
}
});
loveMailsButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent = new Intent(MainActivity.this,LoveMailsActivity.class);
startActivity(intent);
}
});
welcomeScreenButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent = new Intent(MainActivity.this,FirstScreen.class);
startActivity(intent);
}
});
}
#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;
}
#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();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
private void viewsInitialization()
{
hatefullMailButton = (Button) findViewById(R.id.hateful_email_button_id);
loveMailsButton = (Button) findViewById(R.id.love_email_button_id);
welcomeScreenButton = (Button) findViewById(R.id.welcome_screen_button_id);
}
}
In your Activity
#Override
protected void onResume() {
super.onResume();
if (SettingsManager.getBoolean(this, SettingsManager.FIRST_LAUNCH, true)){
SettingsManager.saveBoolean(this, SettingsManager.FIRST_LAUNCH, false);
//your first launch code
}
}
SharedPreference helper class
public class SettingsManager
{
public static final String FIRST_LAUNCH= "first_lauch";
public static String getString(Context context, String key, String defValue) {
return PreferenceManager.getDefaultSharedPreferences(context).getString(key, defValue);
}
public static int getInt(Context context, String key, int defValue) {
return PreferenceManager.getDefaultSharedPreferences(context).getInt(key, defValue);
}
public static boolean getBoolean(Context context, String key, boolean defValue) {
return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(key, defValue);
}
public static void saveString(Context context, String key, String value) {
PreferenceManager.getDefaultSharedPreferences(context).edit().putString(key, value).commit();
}
public static void saveInt(Context context, String key, int value) {
PreferenceManager.getDefaultSharedPreferences(context).edit().putInt(key, value).commit();
}
public static void saveBoolean(Context context, String key, boolean value) {
PreferenceManager.getDefaultSharedPreferences(context).edit().putBoolean(key, value).commit();
}
}
For the future you can write more simple methods on this SettingsManager, like
public static int getFirstLaunch(Context context) {
return getBoolean(context, FIRST_LAUNCH, true);
}
public static int saveFirstLaunch(Context context, boolean value) {
return saveBoolean(context, FIRST_LAUNCH, value);
}
And use it like
#Override
protected void onResume() {
super.onResume();
if (SettingsManager.getFirstLaunch(this)){
SettingsManager.saveFirstLaunch(this, false);
//your first launch code
}
}
The reason why firstScreen does not recognize boolean firstTimeUse in mainActivity is because it does not yet exist. Only after you have executed the line startActivity(intent) will there exist an object of class mainActivity. Basically, you cannot set a boolean on something that does not yet exist.
Instead, what you can do is pass extra information to an activity that is to be started. When the just-started-activity is initializing itself it can read the extra information and act on it.
So build your intent for the activity you want to start and also set extra information in the 'extras':
Intent intent = new Intent(FirstScreen.this,MainActivity.class);
intent.putExtra("firstTimeUse", true);
startActivity(intent);
Now for your MainActivity to know the value of firstTimeUse it must read the extras:
public class MainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
boolean firstTimeUse = getIntent().getBooleanExtra("firstTimeUse", false);
// do processing dependent on whether it's the first time or not
}
}
This should solve your problem of "the MainActivity doesn't recognize the Boolean variable".
Hey I was getting back into android programming, and was doing the developer.google.com tutorial and I dont know what is wrong here...
In the "public void sendMessage(View view) {" line, i get the error ';' expected.
Thanks in advance for your help.
package com.apps.graham.myfirstapp;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Intent;
import android.view.View;
import android.widget.EditText;
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.apps.graham.myfirstapp.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
}
#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_my, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//Called when the user clicks the send button next to the text field.
if (id == R.id.action_settings) return true;
{
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewByID(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
}
}
Tricks:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//Called when the user clicks the send button next to the text field.
if (id == R.id.action_settings) {
//sendMessage(your-view); here, if you want to do that.
return true;
}
return super.onOptionsItemSelected(item);
}
And your new method can't be defined inside another method:
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewByID(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
This question already has answers here:
How to use java classes within one activity?
(4 answers)
Closed 7 years ago.
How can you use a java class within one activity, by that I mean is having different components of that activity spread out in a bunch of java classes. I'm a little new to android and this is what I have tried so far:
MainActivity.java
package com.example.alex.myapplication;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Something(this);
}
#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);
}
}
Something.java
import android.view.View;
import android.widget.EditText;
import android.widget.Button;
import android.app.Activity;
public class Something {
private Activity activity;
private Button add,subtract,multiply,devide;
private EditText editA, editB, editC;
private double doubleA,doubleB,doubleC;
public Something(Activity a){
activity=a;
click();
}
public void click(){
editA = (EditText) activity.findViewById(R.id.editText);
editB = (EditText) activity.findViewById(R.id.editText2);
editC = (EditText) activity.findViewById(R.id.editText3);
doubleA =Double.parseDouble(editA.getText().toString());
doubleB =Double.parseDouble(editB.getText().toString());
add = (Button) activity.findViewById(R.id.add);
subtract = (Button) activity.findViewById(R.id.subtract);
multiply = (Button) activity.findViewById(R.id.multiply);
devide = (Button) activity.findViewById(R.id.devide);
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
doubleC = doubleA+doubleB;
String s = "" + doubleC;
editC.setText(s);
}
});
subtract.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
doubleC = doubleA-doubleB;
String s = "" + doubleC;
editC.setText(s);
}
});
multiply.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
doubleC = doubleA*doubleB;
String s = "" + doubleC;
editC.setText(s);
}
});
devide.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
doubleC = doubleA/doubleB;
String s = "" + doubleC;
editC.setText(s);
}
});
}
}
So I wasn't sure why my listeners weren't working on my buttons so I tried passing the activity to the class that has the listeners added to the buttons but that didn't work in fact now my application won't even start in the emulator. All I wanted to do was have "MainActivity" handle the "Gui" and have the "Something" class handle the listeners but no matter what I do I can't seem to make them communicate with one another to form one Activity.
Someone suggested to do a pass in main activity Something s = new Something(MainActivity.this); and call it from within main activity like this s.click(); but that didn't work.
in android every class that extends activity just have a one xml Layout to view and handle this XML file just in it's Activities,and you can make a lot of java classes that send alot of parameter but when you want to handle XML behavioral you should do in own class that Extends Activity,so you can do this:
public class MainActivity extends ActionBarActivity {
Button myBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Something(this);
myBtn=(Button)findViewById(R.id.Btn);
myBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
}
#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);
}
so I'm fairly new to Android. Lemme just explain first:
I'm trying to make a small portable music app, just for my phone and to test my skills/review what I've learned. I have the mainactivity setup to pick a song with 1 of 4 buttons, and it'll start another activity with buttons to pause, resume, and go back to the song selection screen (MainActivity). I'm trying to get the back button to both release the player and finish the activity, and I've tried many different things but nothing seems to work; the app closes due to some exception (a common one being NullPointerException).
So here's MainActivity:
package me.lemmy.portablemusic.app;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
Button wreckingBall, happy, lig, ligMulti;
Intent songPickedActivity = new Intent("me.lemmy.portablemusic.app.SONGPICKED");
public static MediaPlayer player;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//set buttons
wreckingBall = (Button) findViewById(R.id.song_wreck);
happy = (Button) findViewById(R.id.song_happy);
lig = (Button) findViewById(R.id.song_lig);
ligMulti = (Button) findViewById(R.id.song_lig_multi);
//listeners
wreckingBall.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.wrecking_ball);
player.start();
}
});
happy.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.happy);
player.start();
}
});
lig.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.let_it_go);
player.start();
}
});
ligMulti.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.let_it_go_multi);
player.start();
}
});
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static MediaPlayer getPlayer(){
return player;
}
}
and here's my SongPicked activity:
package me.lemmy.portablemusic.app;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.media.MediaPlayer;
import android.widget.TextView;
/**
* Created by Lemuel on 6/20/14.
*/
public class SongPicked extends Activity {
TextView text;
Button pause, resume, back;
MediaPlayer player;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_songpicked);
text = (TextView) findViewById(R.id.tvPlaying);
pause = (Button) findViewById(R.id.buttonPause);
resume = (Button) findViewById(R.id.buttonResume);
back = (Button) findViewById(R.id.buttonBack);
player = MainActivity.getPlayer();
pause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
player.pause();
}
});
resume.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
player.start();
}
});
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view){
player.release();
}
});
}
#Override
protected void onPause(){
super.onPause();
finish();
}
}
Any help is appreciated, thanks!
P.S. I know I can't use copyrighted music in my apps, this is just a test.
I suggest to first make sure the activity is in the AndroidManifest file. Second is to change your intent from this:
Intent songPickedActivity = new Intent("me.lemmy.portablemusic.app.SONGPICKED");
into:
Intent songPickedActivity = new Intent(this, SongPicked.class);
Do it as well on the songPickedActivity when going back to MainActivity. You can use putExtra to send data to next intent. For more information click this link.