first look example:
MusiceService code
package mm.shandong.com.testsimplemedia.service;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.MediaPlayer;
import android.os.IBinder;
public class MusicService extends Service {
int currentMusic = 0;//0 means no music playing, 1 means paused, 2 means playing,
int status;
MediaPlayer mp;
String[] musics = new String[]{"first.mp3", "second.mp3", "third.mp3"};
AssetManager am;
public MusicService() {
}
@Override
public void onCreate() {
am = getAssets();
mp = new MediaPlayer();
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
currentMusic++;
currentMusic = currentMusic % musics.length;
playMusic ();
status = 2;
Intent intentTemp = new Intent("Update_Music_State");
intentTemp.putExtra("status", status);
intentTemp.putExtra("currentMusic", currentMusic);
sendBroadcast (intentTemp);
}
});
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("Get_Music_Control");
///Dynamic registration of broadcast receivers for player changes
MusicServiceReceiver musicServiceReceiver = new MusicServiceReceiver();
registerReceiver(musicServiceReceiver, intentFilter);
super.onCreate();
}
public class MusicServiceReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
int control = intent.getIntExtra("control", 0);
switch (control) {
case 0:
//pause
if (status == 2) {
mp.pause();
status = 1;
}
break;
case 1:
///Play
if (status == 0) {
playMusic ();
status = 2;
} else if (status == 1) {
mp.start();
status = 2;
}
break;
case 3:
break;
case 4:
//previous song
if (status == 0) {
if (currentMusic == 0) {
currentMusic = 2;
} else {
currentMusic--;
}
} else if (status == 1) {
if (currentMusic == 0) {
currentMusic = 2;
} else {
currentMusic--;
}
status = 0;
} else if (status == 2) {
if (currentMusic == 0) {
currentMusic = 2;
} else {
currentMusic--;
}
playMusic ();
}
break;
case 5:
//next song
if (status == 0) {
if (currentMusic == 2) {
currentMusic = 0;
} else {
currentMusic++;
}
} else if (status == 1) {
if (currentMusic == 2) {
currentMusic = 0;
} else {
currentMusic++;
}
status = 0;
} else if (status == 2) {
if (currentMusic == 2) {
currentMusic = 0;
} else {
currentMusic++;
}
playMusic ();
}
break;
}
Intent intentTemp = new Intent("Update_Music_State");
intentTemp.putExtra("status", status);
intentTemp.putExtra("currentMusic", currentMusic);
sendBroadcast (intentTemp);
}
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
public void playMusic() {
try {
AssetFileDescriptor ad = am.openFd(musics[currentMusic]);
mp.reset();
mp.setDataSource(ad.getFileDescriptor(), ad.getStartOffset(), ad.getLength());
// mp.create(this,musics[currentMusic]);
mp.prepare();
mp.start();
} catch (Exception e) {
e.printStackTrace ();
}
}
}
TestSimpleMediaActivity code
package mm.shandong.com.testsimplemedia;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import mm.shandong.com.testsimplemedia.service.MusicService;
public class TestSimpleMediaActivity extends AppCompatActivity {
ImageButton imageButton;
TextView textViewMp3Name;
TextView textViewMp3Author;
int status = 0;
String[] authors = new String[]{"Zhang San", "Li Si", "Wang Er"};
String[] names = new String[]{"first", "second", "thrid"};
int currentMusic = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_test_simple_media);
imageButton = (ImageButton) findViewById(R.id.imageButton);
textViewMp3Name = (TextView) findViewById(R.id.textViewMp3Name);
textViewMp3Author = (TextView) findViewById(R.id.textViewMp3Author);
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent("Get_Music_Control");
if (status == 2) {
intent.putExtra("control", 0);
} else {
intent.putExtra("control", 1);
}
sendBroadcast (intent);
}
});
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("Update_Music_State");
MusicStatusReceiver musicStatusReceiver = new MusicStatusReceiver();
/ / Dynamically register the broadcast receiver of activity changes
registerReceiver(musicStatusReceiver, intentFilter);
Intent intent = new Intent(this, MusicService.class);
startService(intent);
Intent intentMusicReceiver = new Intent("Get_Music_Control");
intentMusicReceiver.putExtra("control", 3);
sendBroadcast (intentMusicReceiver);
}
///Previous song
public void preMusic(View view) {
Intent intentMusicReceiver = new Intent("Get_Music_Control");
intentMusicReceiver.putExtra("control", 4);
sendBroadcast (intentMusicReceiver);
}
///next song
public void nextMusic(View view) {
Intent intentMusicReceiver = new Intent("Get_Music_Control");
intentMusicReceiver.putExtra("control", 5);
sendBroadcast (intentMusicReceiver);
}
///Define the broadcast receiver that manipulates the music
public class MusicStatusReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
status = intent.getIntExtra("status", 0);
currentMusic = intent.getIntExtra("currentMusic", 0);
switch (status) {
case 0:
textViewMp3Name.setText(names[currentMusic]);
textViewMp3Author.setText(authors[currentMusic]);
imageButton.setBackgroundResource(R.drawable.play32);
break;
case 1:
textViewMp3Name.setText(names[currentMusic]);
textViewMp3Author.setText(authors[currentMusic]);
imageButton.setBackgroundResource(R.drawable.play32);
break;
case 2:
imageButton.setBackgroundResource(R.drawable.pause32);
textViewMp3Name.setText(names[currentMusic]);
textViewMp3Author.setText(authors[currentMusic]);
break;
}
}
}
}
Layout file code:
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<ImageButton
android:id="@+id/imageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textViewMp3Author"
android:layout_alignStart="@+id/textViewMp3Author"
android:layout_below="@+id/textViewMp3Author"
android:background="@drawable/play32" />
<TextView
android:id="@+id/textViewMp3Name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="song name"
android:textSize="30sp" />
<TextView
android:id="@+id/textViewMp3Author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textViewMp3Name"
android:layout_centerHorizontal="true"
android:text="author"
android:textSize="15sp" />
<Button
android:id="@+id/button10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageButton"
android:layout_toLeftOf="@+id/textViewMp3Name"
android:layout_toStartOf="@+id/textViewMp3Name"
android:onClick="preMusic"
android:text="previous song" />
<Button
android:id="@+id/button11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageButton"
android:layout_toEndOf="@+id/textViewMp3Name"
android:layout_toRightOf="@+id/textViewMp3Name"
android:onClick="nextMusic"
android:text="Next" />
</RelativeLayout>
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Demo download
Finally , the above examples are all sourced from Android worry-free, please go to the application treasure or pea pod to download: http://android.myapp.com/myapp/detail.htm?apkName=com.shandong.mm. androidstudy , the source code example document is exhausted.