Android 广播监听HOME键事件（只监听，非拦截）

有时候我们写的APP要在按下HOME键返回桌面前做一些保存数据等操作，这样就要涉及到HOME事件的监听，下面是用广播监听HOME事件的代码和代码的使用方法。（PS：这段类代码是我从一个叫做 推聊 的APP源代码里面挖出来的~ 我这里是写它的使用方法，不算抄袭吧？！）

HomeWatcher.java 类：封装了HOME点击事件的广播接收者、注册广播接收者方法以及设置了两个回调接口方法。

/**
 * Home键监听封装
 */
public class HomeWatcher {

	static final String TAG = "HomeWatcher";
	private Context mContext;
	private IntentFilter mFilter;
	private OnHomePressedListener mListener;
	private InnerRecevier mRecevier;

	// 回调接口
	public interface OnHomePressedListener {
		public void onHomePressed();
		public void onHomeLongPressed();
	}
	
	public HomeWatcher(Context context) {
		mContext = context;
		mRecevier = new InnerRecevier();
		mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
	}

	/**
	 * 设置监听
	 * @param listener
	 */
	public void setOnHomePressedListener(OnHomePressedListener listener) {
		mListener = listener;
	}

	/**
	 * 开始监听，注册广播
	 */
	public void startWatch() {
		if (mRecevier != null) {
			mContext.registerReceiver(mRecevier, mFilter);
		}
	}

	/**
	 * 停止监听，注销广播
	 */
	public void stopWatch() {
		if (mRecevier != null) {
			mContext.unregisterReceiver(mRecevier);
		}
	}

	/**
	 * 广播接收者
	 */
	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) {
					L.i(TAG, "action:" + action + ",reason:" + reason);
					if (mListener != null) {
						if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
							// 短按home键
							mListener.onHomePressed();
						} else if (reason
								.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
							// 长按home键
							mListener.onHomeLongPressed();
						}
					}
				}
			}
		}
	}
}

好，下面就是这个类在你要监听HOME事件的Activity中的使用方法：

public class MyActivity extends Activity implements OnHomePressedListener{
	
	private HomeWatcher mHomeWatcher;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	@Override
	protected void onResume() {
		super.onResume();
		mHomeWatcher = new HomeWatcher(this);
		mHomeWatcher.setOnHomePressedListener(this);
		mHomeWatcher.startWatch();
	}

	@Override
	protected void onPause() {
		super.onPause();
		mHomeWatcher.setOnHomePressedListener(null);
		mHomeWatcher.stopWatch();
	}

	@Override
	public void onHomePressed() {
		// TODO 点击HOME键时 要做的事情
	}

	@Override
	public void onHomeLongPressed() {
		// TODO 长按HOME键时 要做的事情
	}
}

注释不多，但是只要有点基础的应该都很容易能看懂哈！ 

好了，祝大家新年快乐！