这个技术只要掌握好WindowManager的显示类型即可。只要学会了该知识点，就能够实现例如360，QQ管家那样的悬浮窗效果。下面看看效果图。。。

核心代码：

	private boolean isAdded = false; // 是否已增加悬浮窗
	private static WindowManager wm;
	private static WindowManager.LayoutParams params;
	private LinearLayout layout;
	private Button btnStart;
	private Button btnScreen;

实现函数

/**
	 * 创建悬浮窗
	 */
	@SuppressLint("ClickableViewAccessibility")
	private void createFloatView() {
		btnStart = new Button(getApplicationContext());
		btnStart.setText(getString(R.string.string_init));
		btnStart.setOnClickListener(this);
		btnScreen = new Button(getApplicationContext());
		btnScreen.setText(getString(R.string.string_screen));
		btnScreen.setOnClickListener(this);
		wm = (WindowManager) getApplicationContext().getSystemService(
				Context.WINDOW_SERVICE);
		params = new WindowManager.LayoutParams();
		params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
		/*
		 * 如果设置为params.type = WindowManager.LayoutParams.TYPE_PHONE; 那么优先级会降低一些,
		 * 即拉下通知栏不可见
		 */
		params.format = PixelFormat.RGBA_8888; // 设置图片格式，效果为背景透明
		// 设置Window flag
		params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
				| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
		/*
		 * 下面的flags属性的效果形同“锁定”。 悬浮窗不可触摸，不接受任何事件,同时不影响后面的事件响应。
		 * wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL |
		 * LayoutParams.FLAG_NOT_FOCUSABLE | LayoutParams.FLAG_NOT_TOUCHABLE;
		 */
		// 设置悬浮窗的长得宽
		params.width = -2;
		params.height = -2;
		// 设置悬浮窗的Touch监听
		layout = new LinearLayout(getApplicationContext());
		layout.setOrientation(LinearLayout.HORIZONTAL);
		layout.setClickable(true);
		layout.setPadding(30, 30, 30, 30);
		layout.addView(btnStart);
		layout.addView(btnScreen);
		layout.setOnTouchListener(new OnTouchListener() {
			int lastX, lastY;
			int paramX, paramY;
			public boolean onTouch(View v, MotionEvent event) {
				switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:
					lastX = (int) event.getRawX();
					lastY = (int) event.getRawY();
					paramX = params.x;
					paramY = params.y;
					break;
				case MotionEvent.ACTION_MOVE:
					int dx = (int) event.getRawX() - lastX;
					int dy = (int) event.getRawY() - lastY;
					params.x = paramX + dx;
					params.y = paramY + dy;
					// 更新悬浮窗位置
					wm.updateViewLayout(layout, params);
					break;
				}
				return true;
			}
		});
		wm.addView(layout, params);
		isAdded = true;
	}

还有一个权限是必须要添加的。

 

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