通過分析SystemUI,發現實際呼叫SurfaceControl.java隱藏類實現拷屏， 但需要系統許可權

public Bitmap captureScreen() {


    Display mDisplay;
    DisplayMetrics mDisplayMetrics;
    WindowManager mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    mDisplay = mWindowManager.getDefaultDisplay();
    mDisplayMetrics = new 
 
DisplayMetrics();
    mDisplay.getRealMetrics(mDisplayMetrics);
    float[] dims = {mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels};
    return SurfaceControl.screenshot((int) dims[0], (int) dims[1]);

}