Android利用廣播監聽按下HOME和電源鍵

MainActivity如下:

package cc.testhome;import cc.testhome.HomeKeyObserver.OnHomeKeyListener;import cc.testhome.PowerKeyObserver.OnPowerKeyListener;import android.os.Bundle;import android.app.Activity;/** * Demo描述: * 利用廣播監聽Home鍵的按下和長按Home鍵 * 利用廣播監聽電源鍵的按下(關閉螢幕) *  * 參考資料: * 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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init() {mHomeKeyObserver = new HomeKeyObserver(this);mHomeKeyObserver.setHomeKeyListener(new OnHomeKeyListener() {@Overridepublic void onHomeKeyPressed() {System.out.println("----> 按下Home鍵");}@Overridepublic void onHomeKeyLongPressed() {System.out.println("----> 長按Home鍵");}});mHomeKeyObserver.startListen(); //////////////////////////////////////////mPowerKeyObserver = new PowerKeyObserver(this);mPowerKeyObserver.setHomeKeyListener(new OnPowerKeyListener() {@Overridepublic void onPowerKeyPressed() {   System.out.println("----> 按下電源鍵");}});mPowerKeyObserver.startListen();}@Overrideprotected void onDestroy() {super.onDestroy();mHomeKeyObserver.stopListen(); //////////////////////////////////////////mPowerKeyObserver.stopListen();}}

HomeKeyObserver如下:

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;}//註冊廣播接收者public void startListen(){mIntentFilter=new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);mHomeKeyBroadcastReceiver=new HomeKeyBroadcastReceiver();    mContext.registerReceiver(mHomeKeyBroadcastReceiver, mIntentFilter);System.out.println("----> 開始監聽");}//取消廣播接收者public void stopListen(){if (mHomeKeyBroadcastReceiver!=null) {mContext.unregisterReceiver(mHomeKeyBroadcastReceiver);System.out.println("----> 停止監聽");}}// 對外暴露介面public void setHomeKeyListener(OnHomeKeyListener homeKeyListener) {mOnHomeKeyListener = homeKeyListener;}// 回調介面public interface OnHomeKeyListener {public void onHomeKeyPressed();public void onHomeKeyLongPressed();}//廣播接收者class HomeKeyBroadcastReceiver extends BroadcastReceiver{final String SYSTEM_DIALOG_REASON_KEY = "reason";//按下Home鍵final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";//長按Home鍵final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";@Overridepublic 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();}}}}}     }

PowerKeyObserver如下:

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;}//註冊廣播接收者public void startListen(){mIntentFilter=new IntentFilter(Intent.ACTION_SCREEN_OFF);mPowerKeyBroadcastReceiver=new PowerKeyBroadcastReceiver();    mContext.registerReceiver(mPowerKeyBroadcastReceiver, mIntentFilter);System.out.println("----> 開始監聽");}//取消廣播接收者public void stopListen(){if (mPowerKeyBroadcastReceiver!=null) {mContext.unregisterReceiver(mPowerKeyBroadcastReceiver);System.out.println("----> 停止監聽");}}// 對外暴露介面public void setHomeKeyListener(OnPowerKeyListener powerKeyListener) {mOnPowerKeyListener = powerKeyListener;}// 回調介面public interface OnPowerKeyListener {public void onPowerKeyPressed();}//廣播接收者class PowerKeyBroadcastReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals(Intent.ACTION_SCREEN_OFF)) {mOnPowerKeyListener.onPowerKeyPressed();}}}     }

main.xml如下: