Develop Reference

How do I connect my floating action button to an activity inside my Android project

I am not sure where I have missed something, I expect the playPauseButton to respond when I click it but nothing happens when I do. I have noticed some errors in my debug console log, which are mostly related to mediaPlayer, but I don't exactly know what they mean, since an quite new to android programming! Below is my debug console log, and a bit of related code:
// Removed Logcat!!
Some code related from a class Player.java:
import android.media.MediaPlayer;
import android.media.AudioManager;
import android.util.Log;
import java.io.IOException;
public class Player {
// Creating new MediaPlayer
MediaPlayer mediaPlayer = new MediaPlayer();
// Creating a public static player as reference to this Player class
public static Player player;
String url = "";
public Player () {
this.player = this;
}
public void playStream (String url) {
if (mediaPlayer != null) {
try {
mediaPlayer.stop();
} catch (Exception e) {
}
// Releasing everything from the mediaPlayer
mediaPlayer = null;
}
// Creating new Media Player
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
// Try & Catch errors
try {
mediaPlayer.setDataSource(url);
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
mediaPlayer.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
}
public void pausePlayer () {
try {
mediaPlayer.pause();
} catch (Exception e) {
Log.d("EXCEPTION", "Failed to pause Media Player");
}
}
public void playPlayer () {
try {
mediaPlayer.start();
} catch (Exception e) {
Log.d("EXCEPTION", "Failed to start Media Player");
}
}
public void togglePlayer () {
try {
if (mediaPlayer.isPlaying())
pausePlayer();
else
playPlayer();
} catch (Exception e) {
Log.d("Exception", "Failed to toggle Media Player");
}
}
}
the other related code from MainActivity.java
public class MainActivity extends AppCompatActivity {
static FloatingActionButton playPauseButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
playPauseButton = (FloatingActionButton) findViewById(R.id.fab);
playPauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
// Songs location on our server
String url = // "*My website/file.mp3";
// Passing above url to our MediaPlayer
if (Player.player == null)
new Player();
Player.player.playStream(url);
}
public static void flipPlayPauseButton (boolean isPlaying) {
if (isPlaying) {
playPauseButton.setImageResource(android.R.drawable.ic_media_pause);
} else {
playPauseButton.setImageResource(android.R.drawable.ic_media_play);
}
}

Try for example:
playPauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(video.isplaying()){pause function()}
else{play function()}
}
});

Okay, I'd like to thank MohammadMoeinGolchin, who has helped me figure this out. It so happen's that I did not complete my function inside of my public void onClik(View view) function. But you will see that is is written somewhere in a separate Player.java class. So to resolve this, what I did instead, is to call the togglePlayer() function inside my onClick(View view) like this:
#Override
public void onClick (View view) {
Player.player.togglePlayer();
}

Android MediaPlayer: How to stop if another audio file is being loaded?

I have a problem with the Android MediaPlayer. As soon as a new sound file is clicked by user input, the old one does not stop, so all audio files overlap.
I already tried common methods like MediaPlayer.stop(); and
MediaPlayer.release();
These methods always result in an app crash, although they are called in the correct order
public void Abspielen(String Datei) {
try {
AndreasPlayer = MediaPlayer.create(MainActivity.this, getResources().getIdentifier(Datei, "raw", getPackageName()));
AndreasPlayer.start();
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Abspielen("filename");
}

I worked out the following solution:
public void Abspielen(String Datei) {
try {
stopKnopf = findViewById(R.id.fab2);
stopKnopf.show();
try {
if (AndreasPlayer.isPlaying()) {
AndreasPlayer.reset();
}
} catch (Exception ex) {
}
AndreasPlayer = MediaPlayer.create(MainActivity.this, getResources().getIdentifier(Datei, "raw", getPackageName()));
AndreasPlayer.start();
stopKnopf.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AndreasPlayer.reset();
stopKnopf.hide();
}
});
AndreasPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
AndreasPlayer.reset();
stopKnopf.hide();
}
});
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
}
}

Stop/start mediaplayer from another activity

i'm trying to play stream radio using Mediaplayer with MP1 as variable of Mediaplayer i want to play it in all Fragments app,expect one activity (ActivityOne) which is contains another Mediaplayer MP2 to play,so i want to stop MP1 when i'm in (ActivityOne) activity, and play MP2 , and when i return from (ActivityOne) i want to resume MP1, my big problem is the (ActivityOne) called when i click button which is exist in fragment
my code below works only in one direction :
when i return from (ActivityOne) activity, the music stops.
structure of the app : MainAcitivty > Fragment > ActivityOne
MainActivity.java
MediaPlayer MP1;
boolean prepared = false;
boolean started = false;
PlayerTask playerTask;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mediaPlayer = new MediaPlayer();
playerTask = new PlayerTask();
playerTask.execute(stream);
/**/
MusicButton = findViewById(R.id.toggleButton);
MusicButton.setVisibility(View.INVISIBLE);
MusicButton.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (started && MusicButton.isChecked()) {
started = false;
MP1.pause();
MusicButton.setChecked(true);
} else {
started = true;
MP1.start();
MusicButton.setChecked(false);
}
}
});
}
#SuppressLint("StaticFieldLeak")
public class PlayerTask extends AsyncTask<String, Void, Boolean> {
ProgressBar loadingRL = findViewById(R.id.progressBar);
#Override
protected void onPreExecute() {
super.onPreExecute();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
AudioAttributes attribs = new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_MEDIA).setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build();
MP1.setAudioAttributes(attribs);
} else {
MP1.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
loadingRL.setVisibility(View.VISIBLE);
}
#Override
protected Boolean doInBackground(String... strings) {
try {
MP1.setDataSource(strings[0]);
MP1.prepare();
prepared = true;
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
MP1.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer MP1) {
MP1.start();
}
});
return prepared;
}
#Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
MusicButton.setVisibility(View.VISIBLE);
MusicButton.setChecked(true);
loadingRL.setVisibility(View.VISIBLE);
}
ActivityOne.java
MediaPlayer MP2;
boolean prepared = false;
boolean started = false;
ToggleButton music;
PlayerTask playerTask = null;
CoordinatorLayout coordinatorLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pop_for_ringtone);
coordinatorLayout = findViewById(R.id.coord);
MP2 = new MediaPlayer();
playerTask = new PlayerTask();
playerTask.execute(url);
}
#SuppressLint("StaticFieldLeak")
public class PlayerTask extends AsyncTask<String, Void, Boolean> {
ProgressBar pb = findViewById(R.id.progress);
#Override
protected void onPreExecute() {
super.onPreExecute();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
AudioAttributes attribs = new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_MEDIA).setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build();
MP2.setAudioAttributes(attribs);
} else {
MP2.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
}
#Override
protected Boolean doInBackground(String... strings) {
if (!isCancelled()) {
try {
MP2.setDataSource(strings[0]);
MP2.prepare();
prepared = true;
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
MP2.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer MP2) {
MP2.start();
}
});
}
return prepared;
}
#Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
music.setEnabled(true);
music.setVisibility(View.VISIBLE);
music.setChecked(true);
all.setVisibility(View.VISIBLE);
}
#Override
protected void onCancelled(Boolean aBoolean) {
if (isCancelled() && MP2.isPlaying()) {
MP2.stop();
}
}
}
#Override
public void onBackPressed() {
if (playerTask != null && playerTask.getStatus() == AsyncTask.Status.FINISHED) {
if (MP2.isPlaying()) {
MP2.stop();
}
} else if (playerTask != null && playerTask.getStatus() != AsyncTask.Status.FINISHED) {
playerTask.cancel(true);
}
super.onBackPressed();
}
i spent 2 days to resolve this problem without any result ,please someone help me i will be thankful to him

You could solve this by using Otto library. First create a new Java class but choose enum instead and inside enum you can add: PLAY and PAUSE for example:
public enum PlaybackEvent {
PLAY, PAUSE
}
Then if you are not using custom Application class create one and extend Application and override inside onCreate method. Inside your app gradle add compile 'com.squareup:otto:1.3.8' then create an instance of Bus inside Application class and register. For example this would look like this:
public class MApplication extends Application {
public static Bus sBus = new Bus(ThreadEnforcer.MAIN);
#Override
public void onCreate() {
super.onCreate();
sBus.register(this);
}
Don't forget to replace in manifest default application class with your new one
<application
android:name="com.packagename.MApplication"
After that in your MainActivity class override and register/unregister your event bus in onResume and in onPause.
#Override
protected void onResume() {
super.onResume();
try {
MApplication.sBus.register(this);
}
catch(Exception e){
e.printStackTrace();
}
}
#Override
protected void onDestroy() {
super.onDestroy();
try {
MApplication.sBus.unregister(this);
}
catch(Exception e){
e.printStackTrace();
}
}
After that in MainActivity create a public void method passing as parameter PlayBackEvent and Subscribe so you can listen a message which will be send from your fragment class. For example:
#Subscribe
public void handlePlaybackEvent(PlaybackEvent event) {
switch (event) {
case PLAY:
if(MP1.isPlaying())
MP1.pause();
break;
case PAUSE:
if(!MP1.isPlaying())
MP1.play();
break;
}
}
And last thing you have to do is to send the message from your fragment when starting second activity and that will go:
MApplication.sBus.post(PlaybackEvent.PAUSE);
and of course you can also send a message to play again MP1 from second activity overriding onBackPressed putting inside line of code:
MApplication.sBus.post(PlaybackEvent.PLAY);
Hope this will help you to resolve the problem.

Have you tried using startActivityForResult()?

MediaPlayer stream from url

I have a simple app and I want to play a mp3 from a url.
when I add this code to OnCreate, the app crashes at opening:
try {
mediaPlayer.setDataSource("http://www.freesfx.co.uk/rx2/mp3s/9/10183_1367780535.mp3");
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
Why? What's wrong with this part of the code?
Complete code:
public class MediaStreamTest extends AppCompatActivity {
ImageButton bPlay;
ImageButton bStop;
MediaPlayer mediaPlayer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_media_stream_test);
bPlay = (ImageButton)findViewById(R.id.btnPlay);
bStop = (ImageButton)findViewById(R.id.btnStop);
try {
mediaPlayer.setDataSource("http://www.freesfx.co.uk/rx2/mp3s/9/10183_1367780535.mp3");
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
bPlay.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mediaPlayer.isPlaying()) {
bPlay.setBackgroundResource(R.drawable.ic_play_arrow_24dp);
mediaPlayer.pause();
}
else {
bPlay.setBackgroundResource(R.drawable.ic_pause_24dp);
mediaPlayer.start();
}
}
});
}
}

The issue is because the MediaPlayer is not being initialized. That's why you are getting a null pointer exception when trying to use it.
Just add:
mediaPlayer = new MediaPlayer();
Before calling MediaPlayer.setDataSource method

android Media Player stream more than 1 URL

I'm using mediaPlayer in my Android application to stream an MP3 url from online. Instead of just playing the 1 url, how can I stream 5 urls to play one after the other? here's my code
Uri myUri = Uri.parse("https://db.tt/9nBgouRf");
final MediaPlayer sdrPlayer = new MediaPlayer();
try {
sdrPlayer.setDataSource(this, myUri);
sdrPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
sdrPlayer.prepare(); //don't use prepareAsync for mp3 playback
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(channelx.this,
"Please turn on WiFi and try again", Toast.LENGTH_LONG).show();
}
play.setOnClickListener( new OnClickListener() {
#Override
public void onClick(View v) {
sdrPlayer.start();
}
}
);

Just create a List to hold all of your URIs
Set up some class variables:
private int playlistPos = 0;
private List<Uri> myUris = new ArrayList<Uri>();
private MediaPlayer sdrPlayer = new MediaPlayer();
Set up a method for initialising the song:
public initSong(Uri myUri) {
try {
sdrPlayer.setDataSource(this, myUri);
sdrPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
sdrPlayer.prepare(); // don't use prepareAsync for mp3 playback
}
catch (IOException e) {
e.printStackTrace();
Toast.makeText(channelx.this,
"Please turn on WiFi and try again",
Toast.LENGTH_LONG).show();
}
}
Then in the onCreate()
myUris.add(Uri.parse("https://db.tt/9nBgouRf"));
// Add the others as well...
initSong(myUris.get(playlistPos);
sdrPlayer.setOnCompletionListener(new OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
playlistPos++;
initSong(myUris.get(playlistPos));
sdrPlayer.start(); // Start it as well if you wish
}
});
play.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
sdrPlayer.start();
}
});