我试图在显示软键盘时捕获“后退”键事件.
我正在使用SDK ver 8并且只能在软键盘为HIDDEN时成功捕获后退键事件,如下所示：
@Override
public void onBackpressed() {
// do something
super.onBackpressed();
}
问题是系统在显示软键盘时没有调用此方法.我试图登录KeyDown / Up()方法以及上面的方法来解决这个场景中发生的事情无济于事.见下文：
@Override
public boolean onKeyUp(int keyCode,KeyEvent event) {
//DEBUGGING
Log.d(TAG + "KeyUP",String.valueOf(event));
}
按预期返回音量和菜单键的日志,但只有在隐藏软键盘和菜单时才会记录后退键.
是否有任何“背键”大师可以解释这种现象？
任何帮助是极大的赞赏.
解决方法
以下是捕获按键事件的方法：
1.扩展editText视图以覆盖onKeyPreIme
1.扩展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;
}
}
> 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"/>
>然后从任何地方附加一个监听器：
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
}
}});