线程以未捕获的异常退出（group = 0x4001b188）。 Nullpointerexception

Question

我有以下错误：线程退出与未捕获的异常（组= 0x4001b188）。 Nullpointerexception 这是由以下代码引起的： package org.apache.android.media;

import android.app.Activity; 
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnBufferingUpdateListener; 
import android.media.MediaPlayer.OnCompletionListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.media.MediaPlayer.OnVideoSizeChangedListener; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.widget.Toast; 


public class VideoViewDemo extends Activity implements 
    OnBufferingUpdateListener, OnCompletionListener, 
    OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback { 

private static final String TAG = "MediaPlayerDemo"; 
private int mVideoWidth; 
private int mVideoHeight; 
private MediaPlayer mMediaPlayer; 
private SurfaceView mPreview; 
private SurfaceHolder holder; 
private String path; 
private Bundle extras; 
private static final String MEDIA = "media"; 
private static final int LOCAL_AUDIO = 1; 
private static final int STREAM_AUDIO = 2; 
private static final int RESOURCES_AUDIO = 3; 
private static final int LOCAL_VIDEO = 4; 
private static final int STREAM_VIDEO = 5; 
private boolean mIsVideoSizeKnown = false; 
private boolean mIsVideoReadyToBePlayed = false; 

/** 
* 
* Called when the activity is first created. 
*/ 
@Override 
public void onCreate(Bundle icicle) { 
    super.onCreate(icicle); 
    setContentView(R.layout.main); 
    mPreview = (SurfaceView) findViewById(R.id.surface); 
    holder = mPreview.getHolder(); 
    holder.addCallback(this); 
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
    extras = getIntent().getExtras(); 

} 

private void playVideo(Integer Media) { 
    doCleanUp(); 
    try { 
     path = "http://pwserver/barbapappa.mp4"; 

     // Create a new media player and set the listeners 
     mMediaPlayer = new MediaPlayer(); 
     mMediaPlayer.setDataSource(path); 
     mMediaPlayer.setDisplay(holder); 
     mMediaPlayer.prepare(); 
     mMediaPlayer.setOnBufferingUpdateListener(this); 
     mMediaPlayer.setOnCompletionListener(this); 
     mMediaPlayer.setOnPreparedListener(this); 
     mMediaPlayer.setOnVideoSizeChangedListener(this); 
     mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); 
    } catch (Exception e) { 
     Log.e(TAG, "PdM error: " + e.getMessage(), e); 
    } 
} 

public void onBufferingUpdate(MediaPlayer arg0, int percent) { 
    Log.d(TAG, "onBufferingUpdate percent:" + percent); 

} 

public void onCompletion(MediaPlayer arg0) { 
    Log.d(TAG, "onCompletion called"); 
} 

public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { 
    Log.v(TAG, "onVideoSizeChanged called"); 
    if (width == 0 || height == 0) { 
     Log.e(TAG, "invalid video width(" + width + ") or height(" + height + ")"); 
     return; 
    } 
    mIsVideoSizeKnown = true; 
    mVideoWidth = width; 
    mVideoHeight = height; 
    if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) { 
     startVideoPlayback(); 
    } 
} 

public void onPrepared(MediaPlayer mediaplayer) { 
    Log.d(TAG, "onPrepared called"); 
    mIsVideoReadyToBePlayed = true; 
    if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) { 
     startVideoPlayback(); 
    } 
} 

public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) { 
    Log.d(TAG, "surfaceChanged called"); 

} 

public void surfaceDestroyed(SurfaceHolder surfaceholder) { 
    Log.d(TAG, "surfaceDestroyed called"); 
} 


public void surfaceCreated(SurfaceHolder holder) { 
    Log.d(TAG, "surfaceCreated called"); 
    playVideo(extras.getInt(MEDIA)); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    releaseMediaPlayer(); 
    doCleanUp(); 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    releaseMediaPlayer(); 
    doCleanUp(); 
} 

private void releaseMediaPlayer() { 
    if (mMediaPlayer != null) { 
     mMediaPlayer.release(); 
     mMediaPlayer = null; 
    } 
} 

private void doCleanUp() { 
    mVideoWidth = 0; 
    mVideoHeight = 0; 
    mIsVideoReadyToBePlayed = false; 
    mIsVideoSizeKnown = false; 
} 

private void startVideoPlayback() { 
    Log.v(TAG, "startVideoPlayback"); 
    holder.setFixedSize(mVideoWidth, mVideoHeight); 
    mMediaPlayer.start(); 

}

有人可以检查出来，并希望能告诉我在哪里出了错。我已经调试了几个小时，但没有结果。每一个帮助赞赏！

---

@ Dr.Dredel：我不知道该怎么做

特此logcat的-内容，并感谢帮助：

D/AndroidRuntime(496): Shutting down VM 
W/dalvikvm(496): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 
E/AndroidRuntime(496): Uncaught handler: thread main exiting due to uncaught exception 
E/AndroidRuntime(496): java.lang.NullPointerException 
E/AndroidRuntime(496):  at org.apache.android.media.VideoViewDemo.surfaceCreated(VideoViewDemo.java:133) 
E/AndroidRuntime(496):  at android.view.SurfaceView.updateWindow(SurfaceView.java:454) 
E/AndroidRuntime(496):  at android.view.SurfaceView.dispatchDraw(SurfaceView.java:287) 
E/AndroidRuntime(496):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(496):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(496):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(496):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(496):  at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(496):  at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(496):  at android.view.ViewGroup.drawChild(ViewGroup.java:1531) 
E/AndroidRuntime(496):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(496):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(496):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(496):  at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(496):  at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(496):  at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) 
E/AndroidRuntime(496):  at android.view.ViewRoot.draw(ViewRoot.java:1349) 
E/AndroidRuntime(496):  at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) 
E/AndroidRuntime(496):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) 
E/AndroidRuntime(496):  at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(496):  at android.os.Looper.loop(Looper.java:123) 
E/AndroidRuntime(496):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
E/AndroidRuntime(496):  at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(496):  at java.lang.reflect.Method.invoke(Method.java:521) 
E/AndroidRuntime(496):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
E/AndroidRuntime(496):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
E/AndroidRuntime(496):  at dalvik.system.NativeStart.main(Native Method) 
I/dalvikvm(496): threadid=7: reacting to signal 3 
E/dalvikvm(496): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
D/MediaPlayerDemo(521): surfaceCreated called 
D/AndroidRuntime(521): Shutting down VM 
W/dalvikvm(521): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 
E/AndroidRuntime(521): Uncaught handler: thread main exiting due to uncaught exception 
E/AndroidRuntime(521): java.lang.NullPointerException 
E/AndroidRuntime(521):  at org.apache.android.media.VideoViewDemo.surfaceCreated(VideoViewDemo.java:134) 
E/AndroidRuntime(521):  at android.view.SurfaceView.updateWindow(SurfaceView.java:454) 
E/AndroidRuntime(521):  at android.view.SurfaceView.dispatchDraw(SurfaceView.java:287) 
E/AndroidRuntime(521):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(521):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(521):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(521):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(521):  at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(521):  at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(521):  at android.view.ViewGroup.drawChild(ViewGroup.java:1531) 
E/AndroidRuntime(521):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(521):  at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(521):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(521):  at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(521):  at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(521):  at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) 
E/AndroidRuntime(521):  at android.view.ViewRoot.draw(ViewRoot.java:1349) 
E/AndroidRuntime(521):  at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) 
E/AndroidRuntime(521):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) 
E/AndroidRuntime(521):  at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(521):  at android.os.Looper.loop(Looper.java:123) 
E/AndroidRuntime(521):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
E/AndroidRuntime(521):  at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(521):  at java.lang.reflect.Method.invoke(Method.java:521) 
E/AndroidRuntime(521):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
E/AndroidRuntime(521): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
E/AndroidRuntime(521): at dalvik.system.NativeStart.main(Native Method) 
I/dalvikvm(521): threadid=7: reacting to signal 3 
E/dalvikvm(521): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
I/Process(521): Sending signal. PID: 521 SIG: 9 
D/MediaPlayerDemo(547): surfaceCreated called 
D/AndroidRuntime(547): Shutting down VM 
W/dalvikvm(547): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 
E/AndroidRuntime(547): Uncaught handler: thread main exiting due to uncaught exception 
E/AndroidRuntime(547): java.lang.NullPointerException 
E/AndroidRuntime(547): at org.apache.android.media.VideoViewDemo.surfaceCreated(VideoViewDemo.java:134) 
E/AndroidRuntime(547): at android.view.SurfaceView.updateWindow(SurfaceView.java:454) 
E/AndroidRuntime(547): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:287) 
E/AndroidRuntime(547): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(547): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(547): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(547): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(547): at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(547): at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(547): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) 
E/AndroidRuntime(547): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(547): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 
E/AndroidRuntime(547): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 
E/AndroidRuntime(547): at android.view.View.draw(View.java:6538) 
E/AndroidRuntime(547): at android.widget.FrameLayout.draw(FrameLayout.java:352) 
E/AndroidRuntime(547): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) 
E/AndroidRuntime(547): at android.view.ViewRoot.draw(ViewRoot.java:1349) 
E/AndroidRuntime(547): at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) 
E/AndroidRuntime(547): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) 
E/AndroidRuntime(547): at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(547): at android.os.Looper.loop(Looper.java:123) 
E/AndroidRuntime(547): at android.app.ActivityThread.main(ActivityThread.java:4363) 
E/AndroidRuntime(547): at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(547): at java.lang.reflect.Method.invoke(Method.java:521) 
E/AndroidRuntime(547): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
E/AndroidRuntime(547): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
E/AndroidRuntime(547): at dalvik.system.NativeStart.main(Native Method) 
I/dalvikvm(547): threadid=7: reacting to signal 3 
E/dalvikvm(547): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
I/Process(547): Sending signal. PID: 547 SIG: 9 

Answer 1

我已经面临着同样的今天的问题。

我需要做的就是删除playVideo方法的参数并通过删除“extras.getInt（）”来更新surfaceCreated方法。

通过这样做，我可以播放视频，但我仍然不知道什么额外用于...

希望这有助于