Android之Home鍵監聽封裝

衆所周知，咱們監聽返回鍵事件，沒法是下面兩個方法：

 

public void onBackPressed() {
 //do something
 //super.onBackPressed();
}
	
	@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
	if(keyCode == KeyEvent.KEYCODE_BACK){
		//do something
	}
	return super.onKeyDown(keyCode, event);
}

 

因而乎，咱們理所固然的想到，監聽Home鍵的方法是：if(keyCode == KeyEvent.KEYCODE_HOME)。但實際上，這樣是行不通的，由於此時home鍵的消息在framework層就已經被攔截，因此，咱們在應用中經過此方法是沒法監聽到Home鍵的消息的。那麼咱們如何捕獲Home鍵事件，並做出相應處理呢？其實系統仍是給咱們發出廣播的，下面，就跟你們分享一下，封裝好了的監聽Home鍵的方法：

 

 

/**
 * Home鍵監聽封裝
 * 
 * @author way
 * 
 */
public class HomeWatcher {

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

	// 回調接口
	public interface OnHomePressedListener {
		public void onHomePressed();

		public void onHomeLongPressed();
	}

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

	/**
	 * 設置監聽
	 * 
	 * @param listener
	 */
	public void setOnHomePressedListener(OnHomePressedListener listener) {
		mListener = listener;
		mRecevier = new InnerRecevier();
	}

	/**
	 * 開始監聽，註冊廣播
	 */
	public void startWatch() {
		if (mRecevier != null) {
			mContext.registerReceiver(mRecevier, mFilter);
		}
	}

	/**
	 * 中止監聽，註銷廣播
	 */
	public void stopWatch() {
		if (mRecevier != null) {
			mContext.unregisterReceiver(mRecevier);
		}
	}

	/**
	 * 廣播接收者
	 */
	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) {
					Log.e(TAG, "action:" + action + ",reason:" + reason);
					if (mListener != null) {
						if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
							// 短按home鍵
							mListener.onHomePressed();
						} else if (reason
								.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
							// 長按home鍵
							mListener.onHomeLongPressed();
						}
					}
				}
			}
		}
	}
}

 

接下來，咱們須要在應用中開啓監聽，下面是以在Activity中的應用爲例：

/**
 * 應用HomeWatcher小例
 * 
 * @author way
 * 
 */
public class MainActivity extends Activity {
	private static final String TAG = "MainActivity";
	private HomeWatcher mHomeWatcher;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		mHomeWatcher = new HomeWatcher(this);
		mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
			@Override
			public void onHomePressed() {
				Log.e(TAG, "onHomePressed");
			}

			@Override
			public void onHomeLongPressed() {
				Log.e(TAG, "onHomeLongPressed");
			}
		});
		mHomeWatcher.startWatch();
	}

	@Override
	protected void onPause() {
		super.onPause();
		mHomeWatcher.stopWatch();// 在onPause中中止監聽，否則會報錯的。
	}
}