package cc.testhome; import cc.testhome.HomeKeyObserver.OnHomeKeyListener;import cc.testhome.PowerKeyObserver.OnPowerKeyListener;import android.os.Bundle;import android.app.Activity;/** * Demo描述: * 利用广播监听Home键的按下和长按Home键 * 利用广播监听电源键的按下(关闭屏幕) *  * 参考资料: * 1 http://blog.csdn.net/q445697127/article/details/8432513 * 2 http://blog.csdn.net/watt520/article/details/18959897 * 3 http://blog.csdn.net/lfdfhl/article/details/9903693 *   Thank you very much */public class MainActivity extends Activity {    private HomeKeyObserver mHomeKeyObserver;    private PowerKeyObserver mPowerKeyObserver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        init();    }         private void init() {        mHomeKeyObserver = new HomeKeyObserver(this);        mHomeKeyObserver.setHomeKeyListener(new OnHomeKeyListener() {            @Override            public void onHomeKeyPressed() {                System.out.println("----> 按下Home键");            }             @Override            public void onHomeKeyLongPressed() {                System.out.println("----> 长按Home键");            }        });        mHomeKeyObserver.startListen();          //////////////////////////////////////////                 mPowerKeyObserver = new PowerKeyObserver(this);        mPowerKeyObserver.setHomeKeyListener(new OnPowerKeyListener() {            @Override            public void onPowerKeyPressed() {               System.out.println("----> 按下电源键");            }        });        mPowerKeyObserver.startListen();    }     @Override    protected void onDestroy() {        super.onDestroy();        mHomeKeyObserver.stopListen();                  //////////////////////////////////////////                 mPowerKeyObserver.stopListen();    } }

package cc.testhome; import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter; public class HomeKeyObserver {    private Context mContext;    private IntentFilter mIntentFilter;    private OnHomeKeyListener mOnHomeKeyListener;    private HomeKeyBroadcastReceiver mHomeKeyBroadcastReceiver;    public HomeKeyObserver(Context context) {        this.mContext = context;    }         //注册广播接收者    public void startListen(){        mIntentFilter=new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        mHomeKeyBroadcastReceiver=new HomeKeyBroadcastReceiver();        mContext.registerReceiver(mHomeKeyBroadcastReceiver, mIntentFilter);        System.out.println("----> 开始监听");    }         //取消广播接收者    public void stopListen(){        if (mHomeKeyBroadcastReceiver!=null) {            mContext.unregisterReceiver(mHomeKeyBroadcastReceiver);            System.out.println("----> 停止监听");        }    }         // 对外暴露接口    public void setHomeKeyListener(OnHomeKeyListener homeKeyListener) {        mOnHomeKeyListener = homeKeyListener;    }     // 回调接口    public interface OnHomeKeyListener {        public void onHomeKeyPressed();        public void onHomeKeyLongPressed();    }     //广播接收者    class HomeKeyBroadcastReceiver extends BroadcastReceiver{        final String SYSTEM_DIALOG_REASON_KEY = "reason";        //按下Home键        final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";        //长按Home键        final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";        @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 && mOnHomeKeyListener != null) {                    if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {                        mOnHomeKeyListener.onHomeKeyPressed();                    } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {                        mOnHomeKeyListener.onHomeKeyLongPressed();                    }                }            }        }    }      }

package cc.testhome; import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter; public class PowerKeyObserver {    private Context mContext;    private IntentFilter mIntentFilter;    private OnPowerKeyListener mOnPowerKeyListener;    private PowerKeyBroadcastReceiver mPowerKeyBroadcastReceiver;    public PowerKeyObserver(Context context) {        this.mContext = context;    }         //注册广播接收者    public void startListen(){        mIntentFilter=new IntentFilter(Intent.ACTION_SCREEN_OFF);        mPowerKeyBroadcastReceiver=new PowerKeyBroadcastReceiver();        mContext.registerReceiver(mPowerKeyBroadcastReceiver, mIntentFilter);        System.out.println("----> 开始监听");    }         //取消广播接收者    public void stopListen(){        if (mPowerKeyBroadcastReceiver!=null) {            mContext.unregisterReceiver(mPowerKeyBroadcastReceiver);            System.out.println("----> 停止监听");        }    }         // 对外暴露接口    public void setHomeKeyListener(OnPowerKeyListener powerKeyListener) {        mOnPowerKeyListener = powerKeyListener;    }     // 回调接口    public interface OnPowerKeyListener {        public void onPowerKeyPressed();    }     //广播接收者    class PowerKeyBroadcastReceiver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if (action.equals(Intent.ACTION_SCREEN_OFF)) {                mOnPowerKeyListener.onPowerKeyPressed();            }        }    }      }

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"><!--  main.xml-->     <textview android:layout_centerinparent="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="利用广播监听Home键和电源键"> </textview></relativelayout>