如何将按钮添加到相机预览android？

Question

我正在开发摄影应用程序，我的要求是覆盖效果，以相机预览为我开发code.in此代码我覆盖图像到surfaceview。

public class OverlayLiveCamera extends Activity { 
     Camera camera; 
     LayoutInflater controlInflater = null; 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      requestWindowFeature(Window.FEATURE_NO_TITLE); 

      Preview mPreview = new Preview(this); 
      DrawOnTop mDraw = new DrawOnTop(this); 
      setContentView(mPreview); 
      addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
     } 


     class Preview extends SurfaceView implements SurfaceHolder.Callback{ 

      SurfaceHolder mHolder; 



      Preview(Context context) { 
       super(context); 
       // Install a SurfaceHolder.Callback so we get notified when the 
       // underlying surface is created and destroyed. 
       mHolder = getHolder(); 
       mHolder.addCallback(this); 
       mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
      } 



      public void surfaceCreated(SurfaceHolder holder) { 
       // The Surface has been created, acquire the camera and tell it where 
       // to draw. 
       camera = Camera.open(); 
       try { 
        camera.setPreviewDisplay(holder); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 

      public void surfaceDestroyed(SurfaceHolder holder) { 
       // Surface will be destroyed when we return, so stop the preview. 
       // Because the CameraDevice object is not a shared resource, it's very 
       // important to release it when the activity is paused. 
       camera.stopPreview(); 
       camera = null; 
      } 

      public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { 
       // Now that the size is known, set up the camera parameters and begin 
       // the preview. 
       Camera.Parameters parameters = camera.getParameters(); 
       parameters.setPreviewSize(w, h); 
       parameters=camera.getParameters(); 
       camera.setParameters(parameters); 
       camera.startPreview(); 
      } 
     } 
     class DrawOnTop extends View { 

      public DrawOnTop(Context context) { 


       super(context); 

       // TODO Auto-generated constructor stub 
      } 

      @Override 
      protected void onDraw(Canvas canvas) { 
       // TODO Auto-generated method stub 
       Bitmap mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.water); 
       Paint paint = new Paint(); 
       paint.setAlpha(100); 
       canvas.drawBitmap(mBitmap, 0, 0, paint); 


       super.onDraw(canvas); 
      } 

     } 

我的XML代码

<FrameLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
    <SurfaceView android:id="@+id/surfaceView1" android:layout_width="wrap_content" android:layout_height="wrap_content"></SurfaceView> 
    <LinearLayout android:id="@+id/linearLayout1" android:layout_width="wrap_content" android:layout_height="wrap_content"> 
     <Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> 
     <Button android:text="Button" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> 
    </LinearLayout> 

</FrameLayout> 

因为它会surfaceview和叠加图像，但它不会显示按钮，还当我点击按钮覆盖视图捕获和保存到SD卡。

请帮帮我。

Answer 1

U可以通过使用下面的代码添加按钮..

<FrameLayout android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_weight="2" 
    android:padding="5dip" 
    > 
    <com.commonlib.controls.CameraPreview 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_weight="1" 
    android:layout_gravity="center" 
    android:id="@+id/surface_camera" 
    /> 
    <Button android:id="@+id/target" 
    android:layout_gravity="center" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="surfacebuttonview" 
    > 
    </Button> 
</FrameLayout>