我正在使用以下代码从sdcard中的目录连续播放音频文件。
我面临的问题是所有文件一次播放。我需要一个接一个地玩。
mPlay.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
getFiles();
}
private void getFiles() {
// TODO Auto-generated method stub
File dir = new File("/sdcard/sdcard");
int index=0;
String[] children = dir.list();
for(int i=0;i<children.length;i++)
{
String filename=children[i];
playAudio(filename);
}
}
private void playAudio(String filename) {
// TODO Auto-generated method stub
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(filename);
} catch (IllegalArgumentException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
mPlayer.prepare();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
mPlayer.start();
mSeekBar.setMax(mPlayer.getDuration());
new Thread(new Runnable(){
@Override
public void run()
{
// TODO Auto-generated method stub
while(mPlayer!=null && mPlayer.getCurrentPosition() <mPlayer.getDuration())
{
Log.d("Indide Run Method",Integer.toString(mPlayer.getCurrentPosition()));
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
mSeekBar.setProgress(mPlayer.getCurrentPosition());
}
}
}
).start();
mSeekBar.setProgress(mPlayer.getCurrentPosition());
pauseRecord.setVisibility(View.INVISIBLE);
}
});
如何解决问题？
05-24 18:34:19.455: DEBUG/MediaPlayer(19961): at dalvik.system.NativeStart.main(Native Method)
05-24 18:34:19.465: WARN/dalvikvm(19961): threadid=3: thread exiting with uncaught exception (group=0x2aadda10)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): Uncaught handler: thread main exiting due to uncaught exception
**05-24 18:34:19.465: ERROR/AndroidRuntime(19961): java.lang.NullPointerException
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.fsp.audio.resume.AudioResume.playChild(AudioResume.java:402)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.fsp.audio.resume.AudioResume.playlist(AudioResume.java:393)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.fsp.audio.resume.AudioResume.access$0(AudioResume.java:391)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.fsp.audio.resume.AudioResume$1.onClick(AudioResume.java:132)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.View.performClick(View.java:2347)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.View.onTouchEvent(View.java:4185)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.widget.TextView.onTouchEvent(TextView.java:6521)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.View.dispatchTouchEvent(View.java:3717)**
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.app.Activity.dispatchTouchEvent(Activity.java:1987)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.view.ViewRoot.handleMessage(ViewRoot.java:1659)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.os.Handler.dispatchMessage(Handler.java:99)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.os.Looper.loop(Looper.java:123)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at android.app.ActivityThread.main(ActivityThread.java:4203)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at java.lang.reflect.Method.invokeNative(Native Method)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at java.lang.reflect.Method.invoke(Method.java:521)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): at dalvik.system.NativeStart.main(Native Method)
05-24 18:34:21.435: ERROR/dun_service(19989): Unable to open external port /dev/ttyHSUSB0 : No such device
05-24 18:34:26.465: ERROR/dun_service(19991): Unable to open external port /dev/ttyHSUSB0 : No such device
05-24 18:34:31.495: ERROR/dun_service(19993): Unable to open external port /dev/ttyHSUSB0 : No such device
05-24 18:34:36.525: ERROR/dun_service(19995): Unable to open external port /dev/ttyHSUSB0 : No such device
答案 0 :(得分：0)
为了播放另一个文件，您可以使用MediaPlayer.OnCompletionListener：
final MediaPlayer mp1 = new MediaPlayer();
mp1.setAudioStreamType(AudioManager.STREAM_MUSIC);
mp1.setDataSource(file1);
mp1.prepare();
mp1.start();
mp1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp1.release();
//file 1 has played, now play the second
}
});