Android之Home键监听封装

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众所周知，我们监听返回键事件，无法是下面两个方法：

[java] view plaincopy

@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：

[java] view plaincopy

/**
* 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：

[java] view plaincopy

/**
* 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。
}
}

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