EditText监听键盘输入

 第一步，先在布局中为EditText设置属性

<EditText android:singleLine="true" android:imeOptions="actionDone"/>

第二步：在java代码中监听：

myCourse_roomId_input.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { //回车键
        if(actionId == EditorInfo.IME_ACTION_DONE){ Intent intent = new Intent(getActivity(), TopicInfoActivity.class); intent.putExtra(IntentKey.topicId, myCourse_roomId_input.getText().toString()); startActivity(intent); } return true; } });

myCourse_roomId_input.addTextChangedListener(new TextWatcher() { private CharSequence temp; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { temp = s; } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if (temp.length() > 0) {//限制长度
 myCourse_roomId_clear.setVisibility(View.VISIBLE); } else { myCourse_roomId_clear.setVisibility(View.GONE); } } });