OverlayView.java 文件源码

public void addToWindowManager() {
    WindowManager.LayoutParams windowLayoutParams = new WindowManager.LayoutParams(
            CANVAS_WIDTH,
            CANVAS_HEIGHT,
            WindowManager.LayoutParams.TYPE_PHONE,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            PixelFormat.TRANSLUCENT);
    windowLayoutParams.gravity = Gravity.BOTTOM | Gravity.END;

    mLinearLayout = new LinearLayout(mContext);
    mLinearLayout.setBackgroundColor(Color.BLACK);
    mWindowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
    mWindowManager.addView(mLinearLayout, windowLayoutParams);

    TextView textView = new TextView(mContext);
    textView.setTextColor(Color.RED);
    textView.setText(
            String.format("Name: %s \n Code: %s",
                    mPackageInfo.versionName,
                    mPackageInfo.versionCode)
    );
    mLinearLayout.addView(textView);
}