只需在活动中覆盖下面的代码

 @Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (getCurrentFocus() != null) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
    }
    return super.dispatchTouchEvent(ev);
}

更新:

如果有人需要这个答案的Kotlin版本:

override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
    if (currentFocus != null) {
        val imm = activity!!.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.hideSoftInputFromWindow(activity!!.currentFocus!!.windowToken, 0)
    }
    return super.dispatchTouchEvent(ev)
}

另一个想法是覆盖onInterceptTouchEvent方法在根视图为您的活动。

触摸事件从屏幕上最前面的视图(触摸事件发生的地方)沿着调用onTouch方法的视图堆栈向下移动，直到任何视图返回true，表明触摸事件被消费。由于许多视图默认使用触摸事件(例如，EditText或TextView的情况)，事件不会到达活动的根视图onTouch方法。

But, before do this traversal, the touch event travels another path, going from the root view down the view tree until it gets to the front most view. This traversal is done by calling onInterceptTouchEvent. If the method returns true, it intercepts the event... nahhh, but that is a little bit trick, I don't think you want to do that nor to know the details. What you need to know is that you can override this method on the root view for your Activity, and put there the code to hide the keyboard when necessary.

要解决这个问题，你必须首先使用Edittext的setOnFocusChangeListener

edittext.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (!hasFocus) {
                    Log.d("focus", "focus loosed");
                    // Do whatever you want here
                } else {
                    Log.d("focus", "focused");
                }
            }
        });

然后你需要做的是覆盖dispatchTouchEvent在活动中包含的编辑文本见下面的代码

@Override
public boolean dispatchTouchEvent(MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        View v = getCurrentFocus();
        if ( v instanceof EditText) {
            Rect outRect = new Rect();
            v.getGlobalVisibleRect(outRect);
            if (!outRect.contains((int)event.getRawX(), (int)event.getRawY())) {
                Log.d("focus", "touchevent");
                v.clearFocus();
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
            }
        }
    }
    return super.dispatchTouchEvent(event);
}

现在会发生的是当用户点击外部时首先dispatchTouchEvent会被调用它会从编辑文本中清除焦点现在你的OnFocusChangeListener会被调用焦点已经改变了现在在这里你可以做任何你想做的希望它能起作用

加上之前的@sumit sonawane的答案，这个解决方案不会在用户滚动时隐藏键盘。

public long pressTime = 0;
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (ev.getAction() == MotionEvent.ACTION_DOWN) {
        pressTime = System.currentTimeMillis();
    }
    else if (ev.getAction() == MotionEvent.ACTION_UP) {
        long releaseTime = System.currentTimeMillis();
        if (releaseTime-pressTime < 200) {
            if (getCurrentFocus() != null) {
                GhostTube.print("BottomNavActivity", "Touch event with keyboard detected...");
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
            }
        }
    }
    return super.dispatchTouchEvent(ev);
}

添加代码到您的活动，也将照顾片段。

活动

 @Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
     ScreenUtils.hideKeyboard(this, findViewById(android.R.id.content).getWindowToken());
     return super.dispatchTouchEvent(ev);
 }

ScreenUtils

 public static void hideKeyboard(Context context, IBinder windowToken) {
     InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
     imm.hideSoftInputFromWindow(windowToken, InputMethodManager.HIDE_NOT_ALWAYS);
 }

使用OnFocusChangeListener。

例如:

editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (!hasFocus) {
            hideKeyboard();
        }
    }
});

更新:你也可以覆盖onTouchEvent()在你的活动和检查触摸的坐标。如果坐标在EditText之外，则隐藏键盘。