dialog形式的activity屏幕触摸事件总结

Dialog大家都在项目中会用到，前两天在项目中我们要弹出一个Activity形式的dialog，大家都知道dialog本身提供了触摸屏幕事件:

比如说dialog的setCanceledOnTouchOutside方法，而弹出一个activity形式的dialog如何去设置呢？

首先我们看下dialog：

 /**
     * Sets whether this dialog is canceled when touched outside the window's
     * bounds OR pressed the back key. If setting to true, the dialog is
     * set to be cancelable if not
     * already set.
     *
     * @param cancel Whether the dialog should be canceled when touched outside
     * the window OR pressed the back key.
     */
    public MaterialDialog setCanceledOnTouchOutside(boolean cancel) {
        this.mCancel = cancel;
        if (mBuilder != null) {
            mBuilder.setCanceledOnTouchOutside(mCancel);
        }
        return this;
    }

大概意思就是：大概意思就是当初莫屏幕外会点击返回键的时候dialog是否可以关闭，如果设置true，可以取消，点击返回键可以关闭 掉。对于部分4.0手机可能不起作用。
大家要注意。关于dialog大家在熟悉不过，这里不做 过多的说明。

有关于弹出来一个Theme形式的activity，如何实现向dialog一样点击屏幕不消失呢？

这里需要在activity的方法里写入两个标识：

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //getWindow().setFlags(WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH, WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL);
        initVoidData();
        init();
    }

其中：

  /** Window flag: even when this window is focusable (its
         * {@link #FLAG_NOT_FOCUSABLE} is not set), allow any pointer events
         * outside of the window to be sent to the windows behind it.  Otherwise
         * it will consume all pointer events itself, regardless of whether they
         * are inside of the window. */
        public static final int FLAG_NOT_TOUCH_MODAL    = 0x00000020;

WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL大体意思是用于窗口标志位的表示，将消耗触摸事件，进行行向下传递。
而第二个则是：

        /** Window flag: if you have set {@link #FLAG_NOT_TOUCH_MODAL}, you
         * can set this flag to receive a single special MotionEvent with
         * the action
         * {@link MotionEvent#ACTION_OUTSIDE MotionEvent.ACTION_OUTSIDE} for
         * touches that occur outside of your window.  Note that you will not
         * receive the full down/move/up gesture, only the location of the
         * first down as an ACTION_OUTSIDE.
         */
        public static final int FLAG_WATCH_OUTSIDE_TOUCH = 0x00040000;

大体意思是如果你设置了这个标识，则你可以通过这个标识接收一个特殊的动作，触摸发生在你的窗口之外。 注意，你不会接收完整的向下/移动/向上手势，只有位置第一次作为ACTION_OUTSIDE。此时触摸事件向下传递。

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