防止Android-AutoCompleteTextView-Dropdown在其外部和任何其他字段上单击时不显示

autoCompleteTextView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            // 点击AutoCompleteTextView以外的区域，隐藏下拉列表
            if (event.getRawX() < autoCompleteTextView.getLeft() ||
                    event.getRawX() > autoCompleteTextView.getRight() ||
                    event.getRawY() < autoCompleteTextView.getTop() ||
                    event.getRawY() > autoCompleteTextView.getBottom()) {
                autoCompleteTextView.dismissDropDown();
            }
        }
        return false;
    }
});

View overlay = findViewById(R.id.overlay);
overlay.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        autoCompleteTextView.dismissDropDown();
        return false;
    }
});

<View
    android:id="@+id/overlay"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent" />