Prise de photo automatique et preview Camera

Bonjour,

Je suis en train de développer une application Android qui prend des photos toutes les n secondes mais je n'arrive pas à afficher de preview de ma caméra sur mon téléphone.

Soit une image blanche s'affiche (dans le cas ou j'enlève tout affichage de preview) soit (lorsque je set la preview) l'application plante

Logcat:

    03-29 10:51:16.575: D/AndroidRuntime(660): Shutting down VM   
    03-29 10:51:16.575: W/dalvikvm(660): threadid=1: thread exiting with uncaught exception         (group=0x40c571f8)   
    03-29 10:51:16.575: E/AndroidRuntime(660): FATAL EXCEPTION: main   
    03-29 10:51:16.575: E/AndroidRuntime(660): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.photopic/com.example.photopic.MainActivity}: java.lang.NullPointerException   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread.access$600(ActivityThread.java:127)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.os.Handler.dispatchMessage(Handler.java:99)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.os.Looper.loop(Looper.java:137)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread.main(ActivityThread.java:4511)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at java.lang.reflect.Method.invokeNative(Native Method)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at java.lang.reflect.Method.invoke(Method.java:511)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at dalvik.system.NativeStart.main(Native Method)   
    03-29 10:51:16.575: E/AndroidRuntime(660): Caused by: java.lang.NullPointerException   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at com.example.photopic.MainActivity.onCreate(MainActivity.java:243)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.Activity.performCreate(Activity.java:4470)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)   
    03-29 10:51:16.575: E/AndroidRuntime(660):  ... 11 more

MainActivity:

class ImageSender implements Runnable{   
        
     final private int limit = 5;   
     int current = 0;   
     boolean alive=true;   
       
     synchronized void received(){   
      current--;   
      Log.d("PPK","notifay");   
      this.notify();   
     }   

        
     synchronized void reset(){   
      current=0;   
      alive=false;   
      this.notify();   
     }   

     synchronized void alive(){   
      alive=true;   
     }   
        
  @Override   
  public void run() {   
   Log.d("ImageSender", "starting thread");   
   try{   
    while(true){   
     Log.d("ImageSender", "looping");   
     while(alive && current<limit){   
      Log.d("ImageSender", "looping OK");   
      Log.d("PPK","looping  with current" + current);   
      current++;   
        
       mCamera = getCameraInstance();   
                
            try {   
             mCamera.takePicture(null, null, null, mPicture);   
            } catch(Throwable e) {   
             Log.d("ERROR", "Throwable "+e.getMessage());   
             Log.d("ERROR", "Throwable2 "+e.toString());   
            }   
              
      try {   
       Thread.sleep(1050); //50   
      } catch (InterruptedException e) {   
       e.printStackTrace();   
      }   
     }   
     try {   
      synchronized (this) {   
       this.wait(1020);    
      }   
     } catch (InterruptedException e) {   
      e.printStackTrace();   
     }   
    }    
      
   }catch (Throwable t) {   
    // TODO: handle exception    
    Log.d("EX", "expection out of memory ?"+t );   
    t.printStackTrace();   
    clientState = new MyWebSocketListener();   
   }   
  }   
    }   
       

 private String TAG = "HTTPCamera";   
    
 private CameraSurfaceView cameraSurfaceView;   


 @Override   
 public void onCreate(Bundle savedInstanceState) {   
  super.onCreate(savedInstanceState);   

     
  clientState = new MyWebSocketListener();   
     
        requestWindowFeature(Window.FEATURE_NO_TITLE);   
        Window win = getWindow();   
  win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);     
        win.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,   
  WindowManager.LayoutParams.FLAG_FULLSCREEN);    
           
           
           
        Toast.makeText(getApplicationContext(), "hello", Toast.LENGTH_SHORT).show();   

 }   
    
 private Camera mCamera;   
 private PicPreview mPreview;   
 private final static String TAG2 = "MainActivity";   
 private int mCount;   
 private FrameLayout preview;   

       
 //private SocketIO client;   
       
    
 @Override   
 protected void onResume() {   
  super.onResume();   

  setContentView(R.layout.activity_main);   
     
     

  // Create an instance of Camera   
        mCamera = getCameraInstance();   
           
               
        Log.d(TAG2, "setting client done");   
           
        mPreview = new PicPreview(this, mCamera);   
        preview = (FrameLayout) findViewById(R.id.camera_preview);   
        preview.addView(cameraSurfaceView);   
           
        Log.d(TAG, "setting preview done");   
 }   
    
 public void showToast(final String toast)   
 {   
     runOnUiThread(new Runnable() {   
         public void run()   
         {   
             Toast.makeText(MainActivity.this, toast, Toast.LENGTH_LONG).show();   
         }   
     });   
 }   
    
 private PictureCallback mPicture = new PictureCallback() {   
     
     @Override   
     public void onPictureTaken(byte[] byteData, Camera camera) {   
      Log.d(TAG2, "event: picture beginning");   
      Log.d(TAG2, "byte " + byteData);   
         
      Log.d(TAG2, "client: " + clientState);   
         
      clientState.send(byteData);   
         
      Log.d(TAG2, "event: picture sent");   
     }   
 };   
    
 @Override   
 public void onPause() {   
     super.onPause();  // Always call the superclass method first   

     // Release the Camera because we don't need it when paused   
     // and other activities might need to use it.   
     if (mCamera != null) {   
      mCamera.stopPreview();   
         mCamera.release();   
         mCamera = null;   
     }   
 }   
    
 @Override   
 protected void onStop() {   
     super.onStop();  // Always call the superclass method first   

 }   
    
 @Override   
 protected void onStart() {   
     super.onStart();  // Always call the superclass method first   
       
 }   

 @Override   
 protected void onRestart() {   
     super.onRestart();  // Always call the superclass method first   
        
     // Activity being restarted from stopped state       
 }   
    
 public Camera getCameraInstance(){   
  if (mCamera != null) {   
   return mCamera;   
  }   
     
  int cameraId=0;   
     int cameraCount = 0;   
     Camera.CameraInfo cameraInfo = new Camera.CameraInfo();   
        cameraCount = Camera.getNumberOfCameras();   
        for ( int camIdx = 0; camIdx < cameraCount; camIdx++ ) {   
            Camera.getCameraInfo( camIdx, cameraInfo );   
            if ( cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {   
                try {   
                 mCamera = Camera.open( camIdx );   
                 Log.d(TAG2, "cameraId: " + cameraId);   
                 return mCamera;    
                } catch (RuntimeException e) {   
                    Log.e(TAG2, "Camera failed to open: " + e.getLocalizedMessage());   
                }   
            }   
        }   
        return null;   
 }   

 @Override   
 public boolean onCreateOptionsMenu(Menu menu) {   
  // Inflate the menu; this adds items to the action bar if it is present.   
  getMenuInflater().inflate(R.menu.activity_main, menu);   
  return true;   
 }   
    } 

Activity_main.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"   
        >   
      <FrameLayout   
         android:id="@+id/camera_preview"   
         android:layout_width="fill_parent"   
         android:layout_height="fill_parent"   
         android:layout_weight="1"   
         />   
    </LinearLayout>

Manifest:

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

    <uses-sdk   
        android:minSdkVersion="14"   
        android:targetSdkVersion="17" />   
    <uses-permission android:name="android.permission.CAMERA" />   
       
    <uses-feature android:name="android.hardware.camera" />   
    <uses-feature android:name="android.hardware.camera.autofocus" />   
       
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />   
    <uses-permission android:name="android.permission.INTERNET" />   
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />   
 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />   
 <uses-permission android:name="android.permission.READ_PHONE_STATE" />   

    <application   
        android:allowBackup="true"   
        android:icon="@drawable/ic_launcher"   
        android:label="@string/app_name"   
        android:theme="@style/AppTheme" >   
        <activity   
            android:name="com.example.photopic.MainActivity"   
            android:label="@string/app_name"   
            android:screenOrientation="portrait"    
            >   
            <intent-filter>   
                <action android:name="android.intent.action.MAIN" />   

                <category android:name="android.intent.category.LAUNCHER" />   
            </intent-filter>   
        </activity>   
    </application>   

    </manifest>

Est ce que quelqu'un pourrait m'aider sur ce problème ?

Merci d'avance !