众所周知,我们监听返回键事件,无法是下面两个方法:
@Override
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);
}
于是乎,我们理所当然的想到,监听Home键的方法是:if(keyCode == KeyEvent.KEYCODE_HOME)。
但实际上,这样是行不通的,因为此时home键的消息在framework层就已经被拦截,所以,我们在应用中通过此方法是无法监听到Home键的消息的。
那么我们如何捕获Home键事件,并作出相应处理呢?其实系统还是给我们发出广播的,下面,就跟大家分享一下,封装好了的监听Home键的方法:
HomeWatcher类:
/**
* Home键监听封装
*
* @author way
*
*/
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;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
} /**
* 设置监听
*
* @param listener
*/
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
} /**
* 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) {
Log.e(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();
}
}
}
}
}
}
}
接下来,我们需要在应用中开启监听,下面是以在Activity中的应用为例:
/**
* 应用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中停止监听,不然会报错的。
}
}