Apertura de la linterna de Galaxy Nexus

Question

Estoy desarrollando una aplicación que debe abrir la linterna de mi dispositivo Galaxy Nexus. Me he referido a la post aquí

LED flashlight on Galaxy Nexus controllable by what API?

public class TestCamera extends Activity implements SurfaceHolder.Callback{ 
Camera mCamera; 
public static SurfaceView preview; 
public static SurfaceHolder mHolder; 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    preview = (SurfaceView) findViewById(R.id.camSurface); 
    mHolder = preview.getHolder(); 
    mCamera = Camera.open(); 
    try { 
     mCamera.setPreviewDisplay(mHolder); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

    Button onLEDbtn = (Button) findViewById(R.id.onLED_btn); 
    onLEDbtn.setOnClickListener(new OnClickListener(){ 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Toast.makeText(getApplicationContext(), "test", Toast.LENGTH_SHORT).show(); 
      Parameters params = mCamera.getParameters(); 
      params.setFlashMode(Parameters.FLASH_MODE_TORCH); 
      mCamera.setParameters(params);  
      mCamera.startPreview(); 
     } 

    }); 
} 



} 


    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
      int height) { 
     // TODO Auto-generated method stub 

    } 


    public void surfaceCreated(SurfaceHolder holder) { 
     // TODO Auto-generated method stub 
     mHolder = holder; 
     try { 
      mCamera.setPreviewDisplay(mHolder); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 


    public void surfaceDestroyed(SurfaceHolder holder) { 
     // TODO Auto-generated method stub 
     mCamera.stopPreview(); 
      mHolder = null; 
    } 




} 

Manifiesto:

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

Sin embargo, aún no puedo interruptor de la linterna. ¿Alguien podría señalar mis errores? Gracias

Answer 1

intenta agregar:

android:name="android.permission.FLASHLIGHT" 
android:name="android.hardware.camera.flash 

Y mira este post: How to turn on camera flash light programmatically in Android?

Answer 2

Es necesario añadir esta etiqueta en el archivo de manifiesto.

<uses-feature android:name="android.hardware.camera.flash"/> 

Answer 3

usted debe fijar volver a llamar mHolder.addCallback (this);