在Android键盘上检测回事件

Question

我在选项卡控制器中有一些意图,其中一个我有一个编辑文本,我需要知道它何时有焦点,何时失去了这个焦点.我制订最喜欢的焦点侦听器,OnEditorActionListener等等,现在我唯一的问题仍然是事件的是,当我有集中出现的软键盘,我想要么关闭:通过完成按钮,而不是由1)在手机上后退按钮(禁用后退按钮来关闭键盘,而键盘是可见的)2)检测后退按钮事件,而键盘是可见的,这样我可以通过焦点到其他一些控制.

我曾尝试多种方法,但没有成功,像onBackPressed,onConfigurationChanged(在清单中添加hiddenKeyboard),key_down的活动和等,但没有成功.

有人成功吗？实际上,我想当键盘可见时,我按回电话,我的编辑文本失去焦点(otherControl.requestFocus - >这是一个相对布局).

Answer 1

老话题,但这是预期的答案

@Override
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
    if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {
        Toast.makeText(getContext(), "BACK", Toast.LENGTH_SHORT).show();
        return true;
    }
    return super.onKeyPreIme(keyCode, event);
}

你应该将它放在一个覆盖EditText的类中(类MyEditText扩展EditText ...)

Answer 2

这是捕获返回按键事件的方法：1.覆盖editText视图以覆盖onKeyPreIme

package com.test.test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.widget.EditText;

/**
 * Created by sumit.saurabh on 11/10/16.
 */

public class ChatEditText extends EditText
{
    /* Must use this constructor in order for the layout files to instantiate the class properly */
    public ChatEditText(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    private KeyImeChange keyImeChangeListener;

    public void setKeyImeChangeListener(KeyImeChange listener)
    {
        keyImeChangeListener = listener;
    }

    public interface KeyImeChange
    {
        public void onKeyIme(int keyCode, KeyEvent event);
    }

    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event)
    {
        if (keyImeChangeListener != null)
        {
            keyImeChangeListener.onKeyIme(keyCode, event);
        }
        return false;
    }
}

2. xml中的ChatEditText

<com.test.test.ChatEditText
    android:id = "@+id/messageEditText"
    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
    android:layout_gravity = "bottom"
    android:layout_marginLeft = "12dp"
    android:layout_marginRight = "30dp"
    android:background = "@null"
    android:hint = "Type your message"
    android:inputType = "textMultiLine"
    android:singleLine = "false"
    android:textColorHint = "#c4c0bd"
    android:textSize = "18sp"/>

3.然后从任何地方附加一个侦听器，如下所示：

 private ChatEditText messageEditText;
    messageEditText =
       (ChatEditText) findViewById(R.id.messageEditText);
messageEditText.setKeyImeChangeListener(new ChatEditText.KeyImeChange(){
    @Override
    public void onKeyIme(int keyCode, KeyEvent event)
    {
        if (KeyEvent.KEYCODE_BACK == event.getKeyCode())
        {
            // do something
        }
    }});

Answer 3

这里是

 @Override
public boolean dispatchKeyEvent(KeyEvent event) {
      if(event.getKeyCode() == KeyEvent.KEYCODE_BACK)
     {  //do you back event work here
           }    
    return super.dispatchKeyEvent(event);
}