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  • Android Home键监听

     

    Android Back Home键监听

    Back键的监听

      对于Back键的监听比较容易,可以在多个系统回调处拦截,比如在activity的下列方法中都可以收到Back键按下的事件:

        @Override
        public void onBackPressed() {
            // super.onBackPressed();//注释掉这行,back键不退出activity
    
            Log.i(LOG_TAG, "onBackPressed");
        }
    
        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            Log.i(LOG_TAG, "dispatchKeyEvent: keyCode -- " + event.getKeyCode());
            return super.dispatchKeyEvent(event);
        }
    
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            Log.i(LOG_TAG, "onKeyDown: keyCode -- " + keyCode);
    
            switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                Log.i(LOG_TAG, "KeyEvent.KEYCODE_BACK");
                break;
            case KeyEvent.KEYCODE_MENU:
                Log.i(LOG_TAG, "KeyEvent.KEYCODE_MENU");
                break;
            case KeyEvent.KEYCODE_HOME:
                Log.i(LOG_TAG, "KeyEvent.KEYCODE_HOME");
                // 收不到
                break;
            case KeyEvent.KEYCODE_APP_SWITCH:
                Log.i(LOG_TAG, "KeyEvent.KEYCODE_APP_SWITCH");
                // 收不到
                break;
            default:
                break;
            }
    
            return super.onKeyDown(keyCode, event);
    
        }

    Home键的广播监听

      对于Home键的监听不是那么容易,因为Home键可以将程序退出放在后台,所以这个事件是直接分发给系统,系统接收到之后做相应处理,Home键的事件不是直接传递到应用里面.所以在上述监听Back键的代码中,相应的回调中是收不到Home键的事件的.

      参考文后的博客链接,对Home键的监听主要通过注册广播接收器实现,拦截让窗口关闭的系统动作,然后根据Intent里面的具体参数,分析当前到底是Home键, 应用切换键,还是其他功能按键.

      接收器实现如下:

    package com.mengdd.hellohome;
    
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.util.Log;
    
    public class HomeWatcherReceiver extends BroadcastReceiver {
        private static final String LOG_TAG = "HomeReceiver";
        private static final String SYSTEM_DIALOG_REASON_KEY = "reason";
        private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
        private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
        private static final String SYSTEM_DIALOG_REASON_LOCK = "lock";
        private static final String SYSTEM_DIALOG_REASON_ASSIST = "assist";
    
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            Log.i(LOG_TAG, "onReceive: action: " + action);
            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
                // android.intent.action.CLOSE_SYSTEM_DIALOGS
                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
                Log.i(LOG_TAG, "reason: " + reason);
    
                if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {
                    // 短按Home键
                    Log.i(LOG_TAG, "homekey");
    
                }
                else if (SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {
                    // 长按Home键 或者 activity切换键
                    Log.i(LOG_TAG, "long press home key or activity switch");
    
                }
                else if (SYSTEM_DIALOG_REASON_LOCK.equals(reason)) {
                    // 锁屏
                    Log.i(LOG_TAG, "lock");
                }
                else if (SYSTEM_DIALOG_REASON_ASSIST.equals(reason)) {
                    // samsung 长按Home键
                    Log.i(LOG_TAG, "assist");
                }
    
            }
        }
    
    }

      注意不同手机的按键不同,所以需要对不同理由做区分.

    Home键监听广播注册

      广播接收器的注册有两种方式,一种是静态注册,即写在manifest里面声明;另一种是动态注册,即在Java代码里面注册.

      上面对Home键实现监听的这个receiver,静态注册如下:

            <receiver android:name="com.mengdd.hellohome.HomeWatcherReceiver" >
                <intent-filter>
                    <action android:name="android.intent.action.CLOSE_SYSTEM_DIALOGS" />
                </intent-filter>
            </receiver>

      但是发现静态注册不起作用,即收不到onReceive回调.

      采用动态注册:

        private static HomeWatcherReceiver mHomeKeyReceiver = null;
    
        private static void registerHomeKeyReceiver(Context context) {
            Log.i(LOG_TAG, "registerHomeKeyReceiver");
            mHomeKeyReceiver = new HomeWatcherReceiver();
            final IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    
            context.registerReceiver(mHomeKeyReceiver, homeFilter);
        }
    
        private static void unregisterHomeKeyReceiver(Context context) {
            Log.i(LOG_TAG, "unregisterHomeKeyReceiver");
            if (null != mHomeKeyReceiver) {
                context.unregisterReceiver(mHomeKeyReceiver);
            }
        }

      

      在Activity的onResume和onPause里面分别调用:

        @Override
        protected void onResume() {
            super.onResume();
    
            registerHomeKeyReceiver(this);
        }
    
        @Override
        protected void onPause() {
    
            unregisterHomeKeyReceiver(this);
            super.onPause();
        }

      当然也可以根据需要在其他合适的时机注册和注销.

     

    参考资料

      http://blog.csdn.net/way_ping_li/article/details/8953622

     

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  • 原文地址:https://www.cnblogs.com/mengdd/p/3951223.html
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