Question

我正在开发摄影应用程序我的需求是对我开发的代码的相机预览的叠加效果。在此代码中我将图像叠加到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>

因为它会进行surfaceview和叠加图像，但它不会显示按钮，当我点击按钮时，叠加视图捕获并保存到SD卡中。

请帮帮我。

Answer 1

您可以使用以下代码添加按钮..

 <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>

如何添加按钮到相机预览android？

1 个答案: