Question

我将此代码用于 AutoCompleteTextView - 因此当您删除最后一个字符以显示列表时。但 mAutoCompleteTextView.showDropDown（）; 无效。

mAutoCompleteTextView.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {


        }
        @Override
        public void afterTextChanged(Editable s) {
            if (s.toString().equals("")) {
                mAutoCompleteTextView.showDropDown();
            }
        }
    });

Answer 1

初始化小部件时，我记得类字段中的适配器。用它来设置适配器

mAdapter = (ArrayAdapter<String>)actv.getAdapter(); // mAdapter is a class field        
actv.setText("Tim Hortons"); 
actv.setSelection(0, actv.getText().length()); 
actv.setAdapter((ArrayAdapter<String>)null); // turn off the adapter
actv.requestFocus();
Handler handler = new Handler() {
 public void handleMessage(Message msg) {
((AutoCompleteTextView)msg.obj).setAdapter(mAdapter);
};
Message msg = mHandler.obtainMessage();
msg.obj = actv;
handler.sendMessageDelayed(msg, 200);

希望这会对你有所帮助

不要在AutoCompleteTextView中打开下拉列表

1 个答案: