相機應用程序不工作？

我得到了下面的堆棧跟蹤相機應用程序不工作？

04-17 12:11:56.378: D/ATRecorder(10379): com.htc.autotest.dlib.RecordEngine in loader [email protected] 
04-17 12:11:56.408: D/WindowManagerImpl(10379): addView, new view, mViews[0]: [email protected] 
04-17 12:11:56.428: D/WindowManagerImpl(10379): addView, new view, mViews[1]: [email protected] 
04-17 12:11:56.438: D/WindowManagerImpl(10379): finishRemoveViewLocked, mViews[1]: [email protected] 
04-17 12:11:56.718: D/TAG(10379): Error setting camera preview: setPreviewDisplay failed 
04-17 12:11:56.748: D/TAG(10379): Error starting camera preview: setPreviewDisplay failed 
04-17 12:12:07.558: D/View(10379): onTouchEvent: viewFlags: 0x18004001 
04-17 12:12:07.568: D/View(10379): onTouchEvent: isFocusable: true, isFocusableInTouchMode: false, isFocused: false; focusTaken: false 
04-17 12:12:07.588: V/MediaRecorderJNI(10379): start 
04-17 12:12:07.598: V/MediaRecorderJNI(10379): getMediaRecorder E 
04-17 12:12:11.632: V/MediaRecorderJNI(10379): process_media_recorder_call 
04-17 12:12:11.642: W/IMediaDeathNotifier(10379): media server died 
04-17 12:12:11.642: V/MediaRecorderJNI(10379): JNIMediaRecorderListener::notify 
04-17 12:12:11.642: V/MediaRecorderJNI(10379): notify msgType 0x1, ext1 0x64 
04-17 12:12:11.642: W/Camera(10379): ICamera died 
04-17 12:12:11.642: W/Camera(10379): Camera server died! 
04-17 12:12:11.702: E/Camera(10379): Error 100

和我的代碼是

public class VideoDemoActivity extends Activity { 
/** Called when the activity is first created. */ 

private Camera mCamera; 
private CameraPreview mPreview; 
private Button btnCapture,btnStop; 

private MediaRecorder mMediaRecorder; 
FrameLayout preview; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    initialize(); 

    if (!checkCameraHardware(this)) { 

     Toast.makeText(this, "Camera not found", Toast.LENGTH_SHORT).show(); 
     finish(); 

    } else { 

     Toast.makeText(this, "Camera found", Toast.LENGTH_SHORT).show(); 
    } 

    mCamera = getCameraInstance(); 
    mPreview = new CameraPreview(this, mCamera); 
    preview.addView(mPreview); 

    System.out.println(prepareVideoRecorder()); 


    btnCapture.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      try { 

       mMediaRecorder.start(); 
      } catch (IllegalStateException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     } 

    }); 

    btnStop.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      mMediaRecorder.stop(); 
     } 
    }); 

} 

private void initialize() { 
    // TODO Auto-generated method stub 

    preview = (FrameLayout) findViewById(R.id.camera_preview); 
    btnCapture = (Button) findViewById(R.id.button_capture); 
    btnStop = (Button) findViewById(R.id.button_stop); 
} 

public Camera getCameraInstance(){ 
    Camera c = null; 
    try { 
     c = Camera.open(); // attempt to get a Camera instance 
    } 
    catch (Exception e){ 

     e.printStackTrace(); 

    } 
    return c; // returns null if camera is unavailable 
} 

private boolean checkCameraHardware(Context context) { 
    if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ 
     // this device has a camera 
     return true; 
    } else { 
     // no camera on this device 
     return false; 
    } 
} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 

    releaseMediaRecorder();  // if you are using MediaRecorder, release it first 
    releaseCamera();    // release the camera immediately on pause event 

} 

private boolean prepareVideoRecorder(){ 


    mMediaRecorder = new MediaRecorder(); 


    mCamera.unlock(); 
    mMediaRecorder.setCamera(mCamera); 

    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); 
    mMediaRecorder.setOutputFile(getOutputMediaFile().toString()); 



    try 
    { 
     mMediaRecorder.prepare(); 

    } catch (IllegalStateException e) { 
     e.printStackTrace(); 
     releaseMediaRecorder(); 
     return false; 
    } catch (IOException e) { 
     e.printStackTrace(); 
     releaseMediaRecorder(); 
     return false; 
    } 
    return true; 
} 

private void releaseMediaRecorder(){ 
    if (mMediaRecorder != null) { 
     mMediaRecorder.reset(); // clear recorder configuration 
     mMediaRecorder.release(); // release the recorder object 
     mMediaRecorder = null; 
     mCamera.lock();   // lock camera for later use 
    } 
} 

private void releaseCamera(){ 
    if (mCamera != null){ 
     mCamera.release();  // release the camera for other applications 
     mCamera = null; 
    } 
} 

private static File getOutputMediaFile(){ 

    File mediaFile = new File(Environment.getExternalStorageDirectory()+"/video.mp4"); 

    return mediaFile; 
}

}

所以，請幫我解決這個問題..如果我刪除方法

prepareVideoRecorder（）

則預覽相機正確..但這種方法執行之後，在沒有表現出任何preview..and失敗

mMediaRecorder.start（）;

懇求幫助我..

來源

2012-04-17 NullPointerException

你在模擬器或檢查裝置？ – user936414 2012-04-17 06:54:23

不，我測試它在我的HTC手機 – NullPointerException 2012-04-17 07:00:08

你可以請上傳工作示例？我遇到了類似的問題，但無法解決它 – Buksy 2012-12-05 22:57:47

您必須在創建MediaRecorder之前解鎖相機。在釋放它之前鎖定它。

試試這個代碼，它的工作有樂趣...

package com.marcodinacci.book.acb; 

import java.io.IOException; 
import android.app.Activity; 
import android.content.pm.ActivityInfo; 
import android.hardware.Camera; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.view.Surface; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ToggleButton; 

public class MediaRecorderRecipe extends Activity implements SurfaceHolder.Callback { 

    private final String VIDEO_PATH_NAME = "/mnt/sdcard/VGA_30fps_512vbrate.mp4"; 

    private MediaRecorder mMediaRecorder; 
    private Camera mCamera; 
    private SurfaceView mSurfaceView; 
    private SurfaceHolder mHolder; 
    private View mToggleButton; 
    private boolean mInitSuccesful; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.media_recorder_recipe); 

     // we shall take the video in landscape orientation 
     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

     mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView); 
     mHolder = mSurfaceView.getHolder(); 
     mHolder.addCallback(this); 
     mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 

     mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton); 
     mToggleButton.setOnClickListener(new OnClickListener() { 
      @Override 
      // toggle video recording 
      public void onClick(View v) { 
       if (((ToggleButton)v).isChecked()) { 
        mMediaRecorder.start(); 
        try { 
         Thread.sleep(10 * 1000); 
        } catch (Exception e) { 
         e.printStackTrace(); 
        } 
        finish(); 
       } 
       else { 
        mMediaRecorder.stop(); 
        mMediaRecorder.reset(); 
        try { 
         initRecorder(mHolder.getSurface()); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 
       } 
      } 
     });  
    } 

    /* Init the MediaRecorder, the order the methods are called is vital to 
    * its correct functioning */ 
    private void initRecorder(Surface surface) throws IOException { 
     // It is very important to unlock the camera before doing setCamera 
     // or it will results in a black preview 
     if(mCamera == null) { 
      mCamera = Camera.open(); 
      mCamera.unlock(); 
     } 

     if(mMediaRecorder == null) mMediaRecorder = new MediaRecorder(); 
     mMediaRecorder.setPreviewDisplay(surface); 
     mMediaRecorder.setCamera(mCamera); 

     mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 
     //  mMediaRecorder.setOutputFormat(8); 
     mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); 
     mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); 
     mMediaRecorder.setVideoEncodingBitRate(512 * 1000); 
     mMediaRecorder.setVideoFrameRate(30); 
     mMediaRecorder.setVideoSize(640, 480); 
     mMediaRecorder.setOutputFile(VIDEO_PATH_NAME); 

     try { 
      mMediaRecorder.prepare(); 
     } catch (IllegalStateException e) { 
      // This is thrown if the previous calls are not called with the 
      // proper order 
      e.printStackTrace(); 
     } 

     mInitSuccesful = true; 
    } 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     try { 
      if(!mInitSuccesful) 
       initRecorder(mHolder.getSurface()); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
     shutdown(); 
    } 

    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {} 

    private void shutdown() { 
     // Release MediaRecorder and especially the Camera as it's a shared 
     // object that can be used by other applications 
     mMediaRecorder.reset(); 
     mMediaRecorder.release(); 
     mCamera.release(); 

     // once the objects have been released they can't be reused 
     mMediaRecorder = null; 
     mCamera = null; 
    } 

}

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.marcodinacci.book.acb" 
     android:versionCode="1" 
     android:versionName="1.0"> 

    <uses-sdk android:minSdkVersion="7" /> 
    <uses-permission android:name="android.permission.CAMERA"/> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.RECORD_AUDIO" /> 
    <uses-feature android:name="android.hardware.camera.autofocus" /> 

    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
     <activity android:name="MediaRecorderRecipe" 
       android:label="@string/app_name"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 
</manifest>

media_recorder_recipe.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <ToggleButton 
     android:id="@+id/toggleRecordingButton" 
     android:layout_width="fill_parent" 
     android:textOff="Start Recording" 
     android:textOn="Stop Recording" 
     android:layout_height="wrap_content"/> 

    <FrameLayout 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent"> 
     <SurfaceView android:id="@+id/surfaceView" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent"></SurfaceView> 
    </FrameLayout> 

</LinearLayout>

來源

2012-04-17 08:44:28

不抱歉，它不會工作... – NullPointerException 2012-04-17 11:50:26

嘗試我編輯的代碼，希望它會幫助你。 – 2012-04-17 12:11:43

其工作thx很多很好的工作... – NullPointerException 2012-04-17 13:36:56

你有沒有在清單中給出的權限？

<uses-feature android:name="android.hardware.camera" /> 
<uses-permission android:name="android.permission.CAMERA" /> 
<uses-permission android:name = "android.permission.RECORD_AUDIO"/>

來源

2012-04-17 08:23:29 user936414

是的，它已經設置 – NullPointerException 2012-04-17 09:22:21

相機應用程序不工作？

回答

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