截取 SurfaceView [英] Take Screenshot of SurfaceView

问题描述

正在开发一个简单的相机应用.我有代码可以截取整个活动并将其写入 SD 卡.问题是 Surfaceview 返回黑屏.

Am developing a simple camera app. I have code that takes screenshot of the whole activity and writes it to the Sd card. the problem is that the Surfaceview returns a black screen.

我想知道如何仅单独截取表面视图的屏幕截图.这是截取整个活动的屏幕截图的代码.

I would like to know how to independently take a screenshot of the surfaceview only. here is the code that takes the screenshot of the Whole activity.

    findViewById(R.id.screen).setOnClickListener(new OnClickListener() {
      @Override
     public void onClick(View v) {
     final RelativeLayout layout = (RelativeLayout) findViewById(R.id.RelativeLayout1);
      layout.setVisibility(RelativeLayout.GONE);
       Bitmap bitmap = takeScreenshot();
        Toast.makeText(getApplicationContext(),"Please Wait",         Toast.LENGTH_LONG).show();
       saveBitmap(bitmap);
   }
});

}



      public Bitmap takeScreenshot() {
       View rootView = findViewById(android.R.id.content).getRootView();
       rootView.setDrawingCacheEnabled(true);
       return rootView.getDrawingCache();
    }


           public void saveBitmap(Bitmap bitmap) {
         final MediaPlayer cheer = MediaPlayer.create(PicShot.this, R.raw.shutter);
       cheer.start();
        Random generator = new Random();
      int n = 10000;
       n = generator.nextInt(n);
        String fname = "Image-"+ n +".png";
      final RelativeLayout layout = (RelativeLayout)     findViewById(R.id.RelativeLayout1);
     File imagePath = new File(Environment.getExternalStorageDirectory() + "/" + fname);
     FileOutputStream fos;
      try {
        fos = new FileOutputStream(imagePath);
        bitmap.compress(CompressFormat.PNG, 100, fos);
        fos.flush();
        fos.close();
        layout.setVisibility(RelativeLayout.VISIBLE);
        Intent share = new Intent(Intent.ACTION_SEND);
        share.setType("image/*");
        Uri uri = Uri.fromFile(imagePath);
        share.putExtra(Intent.EXTRA_STREAM,uri);
        startActivity(Intent.createChooser(share, "Share Image"));
    } catch (FileNotFoundException e) {
        Log.e("GREC", e.getMessage(), e);
    } catch (IOException e) {
        Log.e("GREC", e.getMessage(), e);
    }
}

推荐答案

SurfaceView 的表面独立于绘制 View 元素的表面.所以捕获 View 内容不会包含 SurfaceView.

The SurfaceView's surface is independent of the surface on which View elements are drawn. So capturing the View contents won't include the SurfaceView.

您需要单独捕获 SurfaceView 内容并执行您自己的合成步骤.进行捕获的最简单方法可能只是重新渲染内容，但使用屏幕外位图作为目标而不是表面.如果您使用 GLES 渲染到屏幕外 pbuffer，则可以在交换缓冲区之前使用 glReadPixels().

You need to capture the SurfaceView contents separately and perform your own composition step. The easiest way to do the capture is probably to just re-render the contents, but use an off-screen bitmap as the target rather than the surface. If you're rendering with GLES to an off-screen pbuffer, you can use glReadPixels() before you swap buffers.

更新: Grafika 的来自相机的纹理"活动演示了实时处理来自带有 OpenGL ES 的相机的视频.EglSurfaceBase#saveFrame() 展示了如何将 GLES 渲染捕获到位图.

Update: Grafika's "texture from camera" activity demonstrates handling live video from the camera with OpenGL ES. EglSurfaceBase#saveFrame() shows how to capture GLES rendering to a Bitmap.

更新:另请参阅此答案，它提供了更多背景信息.

Update: See also this answer, which provides a bit more background.

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