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我已经完成了使用媒体控制器播放音频的代码。我的代码运行正常，但运行代码时发生一些异常。如何创建用于播放音频的媒体控制器？
public class CallHistoryActivity extends Activity implements MediaPlayer.OnPreparedListener, MediaController.MediaPlayerControl{
Button audioPlayer;
private static final String TAG = "AudioPlayer";
public static final String AUDIO_FILE_NAME = "audioFileName";
private MediaPlayer mediaPlayer;
private MediaController mediaController;
private String audioFile;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_history);
audioPlayer = (Button)findViewById(R.id.audioPlayer);
}
public void audioplayer(View view)
{
String path =new String(Environment.getExternalStorageDirectory() + "/NewCallLogs/Yaendi Yaendi.mp3 ");
Uri uri = Uri.parse(path);
mediaPlayer = new MediaPlayer();
mediaController = new MediaController(this);
mediaPlayer.reset();
try {
mediaPlayer.setDataSource(String.valueOf(uri));
} catch (IOException e) {
e.printStackTrace();
}
try {
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
public void stopPlayer(View view)
{
mediaPlayer.stop();
mediaController.hide();
mediaPlayer.release();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//the MediaController will hide after 3 seconds - tap the screen to make it appear again
mediaController.show();
return false;
}
//--MediaPlayerControl methods----------------------------------------------------
public void start() {
mediaPlayer.start();
}
public void pause() {
mediaPlayer.pause();
}
public int getDuration() {
return mediaPlayer.getDuration();
}
public int getCurrentPosition() {
return mediaPlayer.getCurrentPosition();
}
public void seekTo(int i) {
mediaPlayer.seekTo(i);
}
public boolean isPlaying() {
return mediaPlayer.isPlaying();
}
public int getBufferPercentage() {
return 0;
}
public boolean canPause() {
return true;
}
public boolean canSeekBackward() {
return true;
}
public boolean canSeekForward() {
return true;
}
@Override
public int getAudioSessionId() {
return 0;
}
//--------------------------------------------------------------------------------
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.start();
Log.d(TAG, "onPrepared");
mediaController.setMediaPlayer((MediaController.MediaPlayerControl) this);
mediaController.setAnchorView(findViewById(R.id.main_audio_view));
handler.post(new Runnable() {
public void run() {
mediaController.setEnabled(true);
mediaController.show();
}
});
}
}
在logcat中所示的异常如下所示
02-20 14:56:42.402 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 46
02-20 14:56:42.412 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 49
02-20 14:56:42.412 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 50
02-20 14:56:42.422 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 50
02-20 14:56:42.422 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 50
02-20 14:56:42.422 21410-21410/com.sey.newcalllogs E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 52
02-20 14:56:45.442 21410-21410/com.sey.newcalllogs E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
02-20 14:56:53.402 21410-21421/com.sey.newcalllogs E/MediaPlayer: error (1, -2147483648)
02-20 14:56:56.072 21410-21421/com.sey.newcalllogs E/MediaPlayer: error (1, -2147483648)
02-20 14:56:57.602 21410-21421/com.sey.newcalllogs E/MediaPlayer: error (1, -2147483648)
02-20 14:56:58.792 21410-21410/com.sey.newcalllogs E/MediaPlayer: stop called in state 0
02-20 14:56:58.792 21410-21410/com.sey.newcalllogs E/MediaPlayer: error (-38, 0)
然后如下所示
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_audio_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.seyali.newcalllogs.CallHistoryActivity">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/audioPlayer"
android:onClick="audioplayer"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/stopPlaying"
android:onClick="stopPlayer"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Now playing:"
android:textSize="25sp"
android:textStyle="bold"
/>
<TextView
android:id="@+id/now_playing_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dip"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:layout_gravity="center"
android:text="Now playing.."
android:textSize="16sp"
android:textStyle="italic"/>
的布局设计，为媒体控制器，请帮助我如何克服了这个例外。我尝试了所有的方法，但是我的问题没有解决。请帮助我。
看到这个..... https://www.sitepoint.com/a-step-by -step-guide-to-building-an-android-audio-player-app/ –
好吧，我会试试这个。 –
请帮我解决这个例外。 –