多媒体播放API 生命周期束&简介
public class MainActivity extends Activity implements OnClickListener {
private EditText et_path;
private Button bt_play, bt_replay, bt_stop;
private static MediaPlayer mediaPlayer;
public static MediaPlayer getMediaPlayer() {
if (mediaPlayer == null) {
synchronized (MainActivity.class) {
if (mediaPlayer == null) {
mediaPlayer = new MediaPlayer();
}
}
}
return mediaPlayer;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.et_path = (EditText) this.findViewById(R.id.et_path);
this.bt_play = (Button) this.findViewById(R.id.bt_play);
this.bt_replay = (Button) this.findViewById(R.id.bt_replay);
this.bt_stop = (Button) this.findViewById(R.id.bt_stop);
this.bt_play.setOnClickListener(this);
this.bt_replay.setOnClickListener(this);
this.bt_stop.setOnClickListener(this);
if(mediaPlayer != null && mediaPlayer.isPlaying()) {
this.bt_play.setText("暂停");
} else if(mediaPlayer != null ) {
this.bt_play.setText("播放");
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_play:
play();
break;
case R.id.bt_replay:
replay();
break;
case R.id.bt_stop:
stop();
break;
}
}
/**
* 播放或暂停音乐
*/
private void play() {
// 播放状态
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
mediaPlayer.pause();
this.bt_play.setText("播放");
} else if (mediaPlayer != null) {
mediaPlayer.start();
this.bt_play.setText("暂停");
} else {
String path = this.et_path.getText().toString().trim();
File file = new File(path);
if (file.exists()) {
try {
mediaPlayer = getMediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(path);
mediaPlayer.prepare();
mediaPlayer.start();
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
Toast.makeText(getApplication(), "播放完成", 0).show();
stop();
}
});
this.bt_play.setText("暂停");
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "播放错误", 0).show();
}
} else {
Toast.makeText(this, "音频文件不存在", 0).show();
}
}
}
private void replay() {
if(mediaPlayer != null) {
mediaPlayer.seekTo(0);
this.bt_play.setText("暂停");
return;
}
play();
}
private void stop() {
if(mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
this.bt_play.setText("播放");
}
}
}
<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"
android:orientation="vertical"
tools:context=".MainActivity" >
<EditText
android:id="@+id/et_path"
android:text="/storage/sdcard0/MIUI/music/mp3/大地_Beyond.mp3"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/bt_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="播放" />
<Button
android:id="@+id/bt_replay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="重播" />
<Button
android:id="@+id/bt_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="停止" />
</LinearLayout>
</LinearLayout>