Android利用广播监听按下HOME和电源键

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:
 *   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();
            }
        }
    }
      
}

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