Android Home键监听的实现代码

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：

HomeListener.getInstance().start(this);

移除广播

HomeListener.getInstance().stop(this);

设置监听回调

HomeListener.getInstance().setHomeKeylistener(HomePressListener listener）；

添加监听回调

HomeListener.getInstance().addHomeKeyListener(HomePressListener listener）

移除监听回调

HomeListener.getInstance().removeHomeKeyListener(HomePressListener listener);

移除所有监听回调

HomeListener.getInstance().removeAllHomeKeyListener();

销毁

HomeListener.getInstance().destroy();

工具类代码：

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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