Android开发-监听系统的 home键

关于监听home键的方法，在网上找的资料，自己整理了一下

方法一：

这种方法是再次启动应用程序时会执行到（切后台后，再次唤起时）

在AndroidManifest.xml 里相应的Activity里加上 android:launchMode = "singleTask" 

在Activity代码里重载

@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
//从后台切回来的时候执行
Log.i(TAG, "*******onNewIntent");
super.onNewIntent(intent);
}

以下两种方法是按下home键时执行

方法二：

这种方法可能会受sdk版本的限制，请注意

在Activity代码里重载以下两个方法

@Override

 public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(KeyEvent.KEYCODE_HOME==keyCode){

       //要执行的动作或者任务
         Log.i(TAG,"onKeyDown KEYCODE_HOME ");

 }
  return super.onKeyDown(keyCode, event);
 }

   @Override
    public void onAttachedToWindow(){
       this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
       super.onAttachedToWindow();
    }

方法三：

这种方法挺适用的，在2.3，4.0都适用，请采用

现在把源码放上

1.    HomeWatcherActivity .java

package com.android.demos.activity;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import com.android.demos.interfaces.*;
import com.android.demos.utils.HomeWatcher;


public class HomeWatcherActivity extends Activity {


private final String TAG = "HomeWatcherActivity";


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


HomeWatcher mHomeWatcher = new HomeWatcher(this);
mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {


@Override
public void onHomePressed() {
Log.i(TAG, "onHomePressed");
}


@Override
public void onHomeLongPressed() {
Log.i(TAG, "onHomeLongPressed");
}
});

mHomeWatcher.startWatch();
}

}

2.    OnHomePressedListener .java

package com.android.demos.interfaces;

public  interface  OnHomePressedListener {


    public void onHomePressed();


    public void onHomeLongPressed();


}

3.    HomeWatcher .java

package com.android.demos.utils;


import com.android.demos.interfaces.OnHomePressedListener;


import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;


/**
 * watch the HOME key pressed, we only listen the HOME pressed <b>NOT Intercept
 * </b>this pressed.<br>
 * Tips:invoke {@link #startWatch()} in activity's onResume method and
 * {@link #stopWatch()} in activity's onStop Method.
 * 
 * @author
 */
public class HomeWatcher {


static final String TAG = "HomeWatcher";


private Context mContext;


private IntentFilter mFilter;


private OnHomePressedListener mListener;


private InnerRecevier mRecevier;


public HomeWatcher(Context context) {
mContext = context;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}


/**
* set the home pressed listener, if set will callback the home pressed
* listener's method when home pressed.
* 
* @param listener
*/
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
}


/**
* start watch
*/
public void startWatch() {
if (mRecevier != null) {
mContext.registerReceiver(mRecevier, mFilter);
}
}


/**
* stop watch
*/
public void stopWatch() {
if (mRecevier != null) {
mContext.unregisterReceiver(mRecevier);
}
}


class InnerRecevier extends BroadcastReceiver {


final String SYSTEM_DIALOG_REASON_KEY = "reason";


final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";


final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";


final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";


@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
if (reason != null) {
Log.i(TAG, "receive action:" + action + ",reason:" + reason);
if (mListener != null) {
if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {

//home键
mListener.onHomePressed();
} else if (reason
.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {

//长按home键
mListener.onHomeLongPressed();
}
}
}
}
}
}

方法四：自己管理应用程序的activity状态，用一个全局变量来控制 

}