我想製作一個使用相機的Android應用程序,並在預覽畫面上應用圖像處理過濾器。Android,Manupulate相機預覽畫面
package alex.filter;
import java.io.IOException;
import android.content.Context;
import android.graphics.Canvas;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
public Camera camera;
Preview(Context context) {
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) {
for(int i = 0 ; i < data.length ; i ++){
data[ i] = 0; // or some sirius filter
}
Preview.this.invalidate();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(w, h);
camera.setParameters(parameters);
camera.startPreview();
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
}
}
但是,無論我在onPreviewFrame
方法中做什麼,我都看不到模擬器中的更改。
+1,我也想知道是否可以直接操作預覽幀。 –