之前的一个项目需要监听home键的事件，发现用dispatchkeyevent无法实现监听，后来查了些资料，才知道home键不能用常规的按键事件监听，需要使用广播的方法。下面是我封装的一个工具类。根据自己实际需要修改吧。
注册广播：
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homelistener.getinstance().start(this);
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移除广播
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homelistener.getinstance().stop(this);
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设置监听回调
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homelistener.getinstance().sethomekeylistener(homepresslistener listener）；
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添加监听回调
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homelistener.getinstance().addhomekeylistener(homepresslistener listener）
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移除监听回调
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homelistener.getinstance().removehomekeylistener(homepresslistener listener);
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移除所有监听回调
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homelistener.getinstance().removeallhomekeylistener();
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销毁
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homelistener.getinstance().destroy();
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工具类代码：
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import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import java.util.arraylist;
import java.util.list;
import java.util.concurrent.atomic.atomicboolean;
public class homelistener {
public static homekeylistener getinstance() {
homekeylistener listener = homekeylistener.slistener;
listener.init();
return listener;
}
static class homekeylistener {
private static final string system_dialog_reason_recent_apps = "recentapps";//home键旁边的最近程序列表键
private static final string system_dialog_reason_home_key = "homekey";//按下home键
private static final string system_dialog_reason_assist = "assist";//某些三星手机的程序列表键
private static atomicboolean isdestroy = new atomicboolean(true);
private static atomicboolean isregister = new atomicboolean(false);
private static homekeylistener slistener = new homekeylistener();
private list<homepresslistener> mpresslisteners = new arraylist<homepresslistener>();
private homereceiver mreceiver;
private intentfilter mhomefileter;
private homepresslistener mhomepresslistener;
public void init() {
if (isdestroy.get()) {
this.mpresslisteners = new arraylist<homepresslistener>();
this.mreceiver = new homereceiver();
this.mhomefileter = new intentfilter(intent.action_close_system_dialogs);
isdestroy.set(false);
}
}
public synchronized void start(context context) {
if (!isregister.get()) {
context.registerreceiver(mreceiver, mhomefileter);
isregister.set(true);
}
}
public synchronized void stop(context context) {
if (isregister.get()) {
context.unregisterreceiver(mreceiver);
isregister.set(false);
}
}
public void sethomekeylistener(homepresslistener listener) {
this.mhomepresslistener = listener;
}
public void addhomekeylistener(homepresslistener listener) {
mpresslisteners.add(listener);
}
public void removehomekeylistener(homepresslistener listener) {
mpresslisteners.add(listener);
}
public void removeallhomekeylistener() {
mpresslisteners.clear();
}
public void destroy() {
this.mpresslisteners.clear();
this.mpresslisteners = null;
this.mreceiver = null;
this.mhomefileter = null;
this.mhomepresslistener = null;
isdestroy.set(true);
}
public interface homepresslistener {
void onhomepress();
void onhomerecentappspress();
}
class homereceiver extends broadcastreceiver {
@override
public void onreceive(context context, intent intent) {
receive(intent);
}
}
private void receive(intent intent) {
string action = intent.getaction();
if (action != null && action.equals(intent.action_close_system_dialogs)) {
string reason = intent.getstringextra( "reason" );
dispatchpress(reason);
}
}
private void dispatchpress(string reason) {
switch (reason) {
case system_dialog_reason_home_key:
if (mhomepresslistener != null) mhomepresslistener.onhomepress();
for (homepresslistener listener : mpresslisteners) listener.onhomepress();
break;
case system_dialog_reason_recent_apps:
case system_dialog_reason_assist:
if (mhomepresslistener != null) mhomepresslistener.onhomerecentappspress();
for (homepresslistener listener : mpresslisteners) listener.onhomerecentappspress();
break;
}
}
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.jianshu.com/p/ad937a3ca243