Question

在我的应用程序中，我获取外部存在的音频文件列表，并使用该文件的Uri播放第一个文件。我已经为它编写了以下代码。

public class ScrSettings extends Activity{
private Uri uriString;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test);

    Button playsong = (Button) findViewById(R.id.show_me);
    playsong.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            uriString = getFirstSongUri();
            Log.i("Uri is : ", uriString.toString());

            MediaPlayer mp = new MediaPlayer(); 
            try {
                mp.setDataSource(ScrSettings.this, uriString); 
                mp.prepare();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
            mp.start();
        }
    }); 
}
private Uri getFirstSongUri() {
    Cursor media = null;
    String songTitle = "";
    try {
        // query for the numbers associated with the contact
        media = getContentResolver().query(Media.EXTERNAL_CONTENT_URI,
                null, null, null, null);

        while (media.moveToNext()) {
            songTitle = media.getString(media.getColumnIndex(Media.DISPLAY_NAME));
            Uri uri = Media.getContentUri(songTitle);
            return uri;
        }
    } catch (Exception e) {
        Log.e("MediaList", "Failed to get email data", e);
    } finally {
        if (media != null) {
            media.close();
        }
    }
    return null;
}
}

它还会将歌曲的Uri记录在logcat中，但它不播放该文件，我得到以下异常。

02-23 16:06:19.038: W/System.err(1890): java.io.IOException: setDataSource failed.: status=0x80000000
02-23 16:06:19.058: W/System.err(1890):     at android.media.MediaPlayer.setDataSource(Native Method)
02-23 16:06:19.058: W/System.err(1890):     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:800)
02-23 16:06:19.058: W/System.err(1890):     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:725)
02-23 16:06:19.058: W/System.err(1890):     at com.raj.poc.test.ScrSettings$1.onClick(ScrSettings.java:51)
02-23 16:06:19.058: W/System.err(1890):     at android.view.View.performClick(View.java:2532)
02-23 16:06:19.058: W/System.err(1890):     at android.view.View$PerformClick.run(View.java:9293)
02-23 16:06:19.058: W/System.err(1890):     at android.os.Handler.handleCallback(Handler.java:587)
02-23 16:06:19.058: W/System.err(1890):     at android.os.Handler.dispatchMessage(Handler.java:92)
02-23 16:06:19.058: W/System.err(1890):     at android.os.Looper.loop(Looper.java:150)
02-23 16:06:19.058: W/System.err(1890):     at android.app.ActivityThread.main(ActivityThread.java:4277)
02-23 16:06:19.058: W/System.err(1890):     at java.lang.reflect.Method.invokeNative(Native Method)
02-23 16:06:19.058: W/System.err(1890):     at java.lang.reflect.Method.invoke(Method.java:507)
02-23 16:06:19.058: W/System.err(1890):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-23 16:06:19.068: W/System.err(1890):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-23 16:06:19.068: W/System.err(1890):     at dalvik.system.NativeStart.main(Native Method)

任何人都可以告诉我哪里出错了？

Answer 1

我认为我在setDataSource失败时遇到了相同的错误状态，这意味着MediaPlayer无法理解媒体文件的格式。

Answer 2

对于音频，您必须使用 MediaStore.Audio ...

media .getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.AudioColumns.TITLE));

也有look here

使用Uri通过媒体播放器播放音频剪辑

2 个答案: