android home键监听

因为一些特殊程序的要求需要检测 Home 键，activity 类方法：

1	public boolean dispatchKeyEvent (KeyEvent event)

可以重写不同的 keyevent 处理，但是 Home 不会 dispatch 过来，这就让检测 Home 键变得困难了。

PhoneWindowManager 主要负责每个 activity 的 ui 刷新和部分事件的处理，其中：

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void launchHomeFromHotKey() {         if (mKeyguardMediator.isShowingAndNotHidden()) {             // don't launch home if keyguard showing         } else if (!mHideLockScreen && mKeyguardMediator.isInputRestricted()) {             // when in keyguard restricted mode, must first verify unlock             // before launching home             mKeyguardMediator.verifyUnlock( new OnKeyguardExitResult() {                 public void onKeyguardExitResult( boolean success) {                     if (success) {                         try {                             ActivityManagerNative.getDefault().stopAppSwitches();                         } catch (RemoteException e) {                         }                         sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY);                         startDockOrHome();                     }                 }             });         } else {             // no keyguard stuff to worry about, just launch home!             try {                 ActivityManagerNative.getDefault().stopAppSwitches();             } catch (RemoteException e) {             }             sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY);             startDockOrHome();         }     }

其中：

1 2	sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY); startDockOrHome();

发送广播 Intent.ACTION_CLOSE_SYSTEM_DIALOGS，开始 Launch Home，根据这点，我们可以监听广播：

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class InnerRecevier extends BroadcastReceiver {         static final String SYSTEM_DIALOG_REASON_KEY = "reason" ;         static final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions" ;         static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps" ;         static 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)) {  //监听广播                 String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY); //获取原因                 if (reason != null ) {                     Lg.i( "receive action:" + action + ",reason:" + reason);                     if (mListener != null ) {                         if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) { // 按 Home                             mListener.onHomePressed();                         } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) { // 长按 Home                             mListener.onHomeLongPressed();                         }                     }                 }             }         }     }

以下是完整代码：

package com.tiger.watcher;


import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;


import com.tiger.utils.Lg;


/**
* watch the HOME key pressed, we only listen the HOME pressed <b>NOT Intercept
* </b>this pressed.<br>
* Tips:invoke {@link #startWatch()} in activity's onResume method and
* {@link #stopWatch()} in activity's onStop Method.
*
* @author idiottiger
*/
public class HomeWatcher {


    static final String LOG_TAG = "HomeWatcher";


    private Context mContext;


    private IntentFilter mFilter;


    private OnHomePressedListener mListener;


    private InnerRecevier mRecevier;


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


    /**
     * set the home pressed listener, if set will callback the home pressed
     * listener's method when home pressed.
     *
     * @param listener
     */
    public void setOnHomePressedListener(OnHomePressedListener listener) {
        mListener = listener;
        mRecevier = new InnerRecevier();
    }


    /**
     * start watch
     */
    public void startWatch() {
        if (mRecevier != null) {
            mContext.registerReceiver(mRecevier, mFilter);
        }
    }


    /**
     * stop watch
     */
    public void stopWatch() {
        if (mRecevier != null) {
            mContext.unregisterReceiver(mRecevier);
        }
    }


    class InnerRecevier extends BroadcastReceiver {


        static final String SYSTEM_DIALOG_REASON_KEY = "reason";


        static final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";


        static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";


        static 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) {
                    Lg.i("receive action:" + action + ",reason:" + reason);
                    if (mListener != null) {
                        if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                            mListener.onHomePressed();
                        } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                            mListener.onHomeLongPressed();
                        }
                    }
                }
            }
        }


    }


}