1

我正在尝试使用非常简单的代码进行一些视频播放，无论我进行什么更改，我总是遇到同样的问题： onCreate 和 onResume 的最后一行被调​​用，但没有调用其他任何内容，并且 Activity 以在调用 surfaceCreated 之前未捕获的异常。我究竟做错了什么？

import java.io.File;
import java.io.IOException;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;


public class VideoPlayerActivity extends Activity implements SurfaceHolder.Callback {

private MediaPlayer mMediaPlayer;
private SurfaceView vview;
private SurfaceHolder holder;
private String videoPath;
private String id;

@Override
public void onCreate(Bundle icicle) {

    super.onCreate(icicle);
    setContentView(R.layout.videoplayer);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

    System.out.println("Inside VideoPlayerActivity.");

    vview = (SurfaceView) findViewById(R.id.vplay_surface);
    holder = vview.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    System.out.println("Surface and holder configured.");

    //Bundle dungle = getIntent().getExtras();
    //id = dungle.getString("id");
    id = "1";

    videoPath = getFilesDir().getAbsolutePath().toString() + File.separator + "VID" + id + ".mp4";
    System.out.println("PATH: " + videoPath);
    //iniElements();

    } 

@Override
public void onResume() {
    iniElements();
}

private void iniElements() {

    mMediaPlayer = new MediaPlayer();
    System.out.println("MediaPlayer object created.");

    } 

private void iniPlayer() {

    System.out.println("Initiating player!");

    try {
    mMediaPlayer.setDataSource(videoPath);
    mMediaPlayer.prepare();
    } catch (IllegalArgumentException e) {
    e.printStackTrace();
    } catch (IllegalStateException e) {
    e.printStackTrace();
    } catch (IOException e) {
    e.printStackTrace();
    }

    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.start();

    System.out.println("Reached START PLAYER.");

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    System.out.println("Surface changed.");

}

@Override
public void surfaceCreated(SurfaceHolder holder) {

    System.out.println("Surface created!");
    try {
        mMediaPlayer.setDisplay(holder);
    } catch (Exception e) {
        e.printStackTrace();
    }
    System.out.println("Elements configured.");

    iniPlayer();

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    System.out.println("Surface destroyed.");

}

@Override
public void onPause() {
    System.out.println("Activity on pause.");
}


@Override
public void onDestroy () {
    System.out.println("Destroying activity.");
}


}

xml文件很简单：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="268dp"
        android:layout_height="202dp"
        android:layout_marginTop="10dp"
        android:layout_gravity="center"
        android:orientation="horizontal" >

        <SurfaceView
            android:id="@+id/vplay_surface"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:scaleType="centerInside"
        android:gravity="center" />

  </RelativeLayout>

 </LinearLayout>

Logcat 说：

05-06 16:39:51.286: INFO/power(2083): *** acquire_dvfs_lock : lockType : 1  freq : 1200000 
05-06 16:39:51.286: INFO/ActivityManager(2083): START {intent.toShortString} from pid 18751
05-06 16:39:51.286: DEBUG/PowerManagerService(2083): acquireDVFSLockLocked : type : DVFS_MIN_LIMIT  frequency : 1200000  uid : 1000  pid : 2083  tag : ActivityManager
05-06 16:39:51.286: WARN/ActivityManager(2083): mDVFSLock.acquire()
  05-06 16:39:51.306: DEBUG/ActivityManager(2083): Trying to launch applicationName
  05-06 16:39:51.326: DEBUG/AndroidRuntime(18751): Shutting down VM
  05-06 16:39:51.326: WARN/dalvikvm(18751): threadid=1: thread exiting with uncaught exception (group=0x40c341f8)
  05-06 16:39:51.331: WARN/ActivityManager(2083):   Force finishing activity r.intent.getComponent().flattenToShortString()
05-06 16:39:51.336: VERBOSE/yamaha::media::VolumeCtrl(1833): VolumeCtrl::createVolume()
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): Dir0      : AP Playback Music SP (0001h)
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): Dir0Att   : AP Playback Music SP (0001h)
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): DacMaster : AP Playback Music SP (0001h)
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): Sp        : AP Playback Music SP (FD81h)
05-06 16:39:51.336: VERBOSE/yamaha::media::VolumeCtrl(1833): VolumeCtrl::setVolume()
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): VolumeCtrl::setVolume() FM Playback: Ready
05-06 16:39:51.336: DEBUG/yamaha::media::VolumeCtrl(1833): VolumeCtrl::setVolume() VoiceCall: Ready
05-06 16:39:51.336: WARN/ActivityManager(2083):   Force finishing activity r.intent.getComponent().flattenToShortString()
05-06 16:39:51.351: INFO/dumpstate(18883): Check if stand-alone
05-06 16:39:51.356: INFO/dumpstate(18883): begin
05-06 16:39:51.401: INFO/ALSAModule(1833): Initialized ALSA PLAYBACK device hifi
05-06 16:39:51.641: INFO/AudioPolicyManager(1833): stopOutput() output 1, stream 1, session 2190
05-06 16:39:51.681: INFO/AudioFlinger(1833): stop output streamType (0, 1) for 1
05-06 16:39:51.836: WARN/ActivityManager(2083): Activity pause timeout for r

提前致谢！

4

1 回答 1

2

好的，我发现了问题。问题是您无法以这种方式打开 /data/data/package 中的文件。您必须首先使用 openFileInput() 创建一个 FileInputStream，然后参考 FileInputStream 创建一个 File；然后您可以使用该文件获取其文件描述符并将其传递给播放器。如果你想看代码，请索取，我会分享。干杯

于 2012-05-13T13:47:21.347 回答