点击屏幕上EditText区域以外的任何地方隐藏键盘的解决方法

解决思路与iOS中的事件分发机制是类似的，这是Activity.class中的事件分发函数：

（1）下面的函数可以处理所有的点击事件，但是要注意到不能无故拦截。

/**
* Called to process touch screen events.  You can override this to
* intercept all touch screen events before they are dispatched to the
* window.  Be sure to call this implementation for touch screen events
* that should be handled normally.
*
* @param ev The touch screen event.
*
* @return boolean Return true if this event was consumed.
*/
public boolean dispatchTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
onUserInteraction();
}
if (getWindow().superDispatchTouchEvent(ev)) {
return true;
}
return onTouchEvent(ev);
}

（2）用户布局文件中定义的元素都可以接受TouchEvent，下面的函数只是处理窗口之外空白区域的点击。

/**
* Called when a touch screen event was not handled by any of the views
* under it.  This is most useful to process touch events that happen
* outside of your window bounds, where there is no view to receive it.
*
* @param event The touch screen event being processed.
*
* @return Return true if you have consumed the event, false if you haven't.
* The default implementation always returns false.
*/
public boolean onTouchEvent(MotionEvent event) {
if (mWindow.shouldCloseOnTouch(this, event)) {
finish();
return true;
}

return false;
}

因此，需要拦截点击事件进行重新分发，在Activity的任意子类（含SDK或者用户自定义的）中都可以重写：

//点击EditText以外的任何区域隐藏键盘
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
View v = getCurrentFocus();
if (Utils.isShouldHideInput(v, ev)) {
if(Utils.hideInputMethod(this, v)) {
return true; //隐藏键盘时，其他控件不响应点击事件==》注释则不拦截点击事件
}
}
}
return super.dispatchTouchEvent(ev);
}

public static boolean isShouldHideInput(View v, MotionEvent event) {
if (v != null && (v instanceof EditText)) {
int[] leftTop = { 0, 0 };
v.getLocationInWindow(l);
int left = leftTop[0],  top = leftTop[1],  bottom = top + v.getHeight(),  right = left
+ v.getWidth();
if (event.getX() > left && event.getX() < right
&& event.getY() > top && event.getY() < bottom) {
// 保留点击EditText的事件
return false;
} else {
return true;
}
}
return false;
}

public static Boolean hideInputMethod(Context context, View v) {
InputMethodManager imm = (InputMethodManager) context
.getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
return imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
return false;
}