【发布时间】：2011-10-13 11:04:50
【问题描述】：
我有一个用于绘制图像的 SurfaceView，我想将它们叠加到手机摄像头的实时馈送上。我已阅读Overlay images onto camera preview surfaceview 和how to draw an overlay on a surfaceview used by camera on android
public class TestCameraOverlayActivity extends Activity {
Bitmap bitmap;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
Preview mPreview = new Preview(this);
DrawOnTop mDraw = new DrawOnTop(this);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
setContentView(mPreview);
addContentView(mDraw, new LayoutParams (LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
}
class DrawOnTop extends View {
public DrawOnTop(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLACK);
canvas.drawText("Test Text", 10, 10, paint);
canvas.drawBitmap(bitmap, 0, 0, null);
super.onDraw(canvas);
}
}
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
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.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
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.
mCamera.stopPreview();
mCamera = 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 = mCamera.getParameters();
parameters.setPreviewSize(w, h);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
}
如果你运行它，你可以在预览 SurfaceView 上看到图像，但我的问题是如何将它们一起保存为 sdcard 上的 jpeg。如果我需要格式转换，您能否提供一些建议，以便我可以同时保存它们。我只保存图像的部分解决方案
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
FileOutputStream outStream = null;
try {
// write to local sandbox file system
// outStream = CameraDemo.this.openFileOutput(String.format("%d.jpg",
System.currentTimeMillis()), 0);
// Or write to sdcard
outStream = new FileOutputStream(String.format("/sdcard/%d.jpg",
System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d(TAG, "onPictureTaken - jpeg");
}
};
【问题讨论】：
标签： android