私は自分自身をそれと呼ぶことができれば初心者です、そして私は私のプログラムにバグがあり、それをどのように修正することができるか理解できません。ストリーミングソースを使用してオンラインでラジオを再生するこの小さなアプリがあります。
ログは私にこれを教えてくれます：
> 12-09 21:32:35.207: W/WindowManager(60): Pointer down received while already down in: Window{450930b8 com.android.launcher/com.android.launcher2.Launcher paused=false}
> 12-09 21:32:35.347: I/ActivityManager(60): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 .MainRadioActivity bnds=[174,147][230,206] }
> 21:32:35.777: I/Prefetcher(34): max cache size reached 12-09
> 21:32:36.457: I/StagefrightPlayer(34):
> setDataSource('http://64.71.133.122:8000') 12-09 21:32:36.717:
> I/ActivityManager(60): Displayed activity MainRadioActivity: 1580 ms
> (total 1580 ms) 12-09 21:32:36.821: I/Prefetcher(34): max cache size
> reached 12-09 21:32:37.862: I/Prefetcher(34): max cache size reached
> 12-09 21:32:38.902: I/Prefetcher(34): max cache size reached 12-09
> 21:32:39.896: I/Prefetcher(34): max cache size reached
> 12-09 21:32:40.736: E/MediaPlayer(1122): prepareAsync called in state 4
> 12-09 21:32:40.736: D/AndroidRuntime(1122): Shutting down VM
> 12-09 21:32:40.736: W/dalvikvm(1122): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): FATAL EXCEPTION: main
> 12-09 21:32:40.756: E/AndroidRuntime(1122): java.lang.IllegalStateException
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.media.MediaPlayer.prepareAsync(Native Method)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at com.example.***.MainRadioActivity.startPlaying(MainRadioActivity.java:65)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at com.example.***.MainRadioActivity.onClick(MainRadioActivity.java:55)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.view.View.performClick(View.java:2408)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.view.View$PerformClick.run(View.java:8816)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.os.Handler.handleCallback(Handler.java:587)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.os.Handler.dispatchMessage(Handler.java:92)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.os.Looper.loop(Looper.java:123)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at android.app.ActivityThread.main(ActivityThread.java:4627)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at java.lang.reflect.Method.invokeNative(Native Method)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at java.lang.reflect.Method.invoke(Method.java:521)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
> 12-09 21:32:40.756: E/AndroidRuntime(1122): at dalvik.system.NativeStart.main(Native Method)
> 12-09 21:32:40.776: W/ActivityManager(60): Force finishing activity .......
そしてこれは私が持っているコードです：
public class MainRadioActivity extends Activity implements OnClickListener {
private static String RADIO_STATION_URL = "http://64.71.133.122:8000";
private Button buttonPlay;
private Button buttonStopPlay;
private MediaPlayer player;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_radio);
initializeUIElements();
initializeMediaPlayer();
}
private void initializeUIElements() {
buttonPlay = (Button) findViewById(R.id.buttonPlay);
buttonPlay.setOnClickListener(this);
buttonStopPlay = (Button) findViewById(R.id.buttonStopPlay);
buttonStopPlay.setEnabled(false);
buttonStopPlay.setOnClickListener(this);
}
public void onClick(View v) {
if (v == buttonPlay) {
startPlaying();
} else if (v == buttonStopPlay)
stopPlaying();
}
private void startPlaying() {
buttonStopPlay.setEnabled(true);
buttonPlay.setEnabled(false);
player.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
player.start();
}
});
player.prepareAsync();
}
private void stopPlaying() {
if (player.isPlaying()) {
player.stop();
player.release();
initializeMediaPlayer();
}
buttonPlay.setEnabled(true);
buttonStopPlay.setEnabled(false);
}
private void initializeMediaPlayer() {
player = new MediaPlayer();
try {
player.setDataSource(RADIO_STATION_URL);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
protected void onPause() {
super.onPause();
if (player.isPlaying()) {
player.stop();
}
}
}
どんな助けでも大歓迎です:)！