系统按键：Home键和最近任务键的监听器简单封装

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package com.ldw.parentcarefree.utils;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;/** * 监听系统按键，Home键、最近任务键 * Created by ldw on 2016/8/22. */public class SystemKeyWatcher {    private static final String TAG = "SystemKeyWatcher";    private Context mContext = null;    private SystemKeyReceiver mSystemKeyReceiver = null;    private OnSystemKeyListener mOnSystemKeyListener = null;    /**     * 构造函数，必须传上下文参数     * @param context     */    public SystemKeyWatcher(Context context) {        if(context == null){            throw new IllegalArgumentException("Parameters cannot be null");        }        mContext = context;    }    public interface OnSystemKeyListener {        /**         * Home键         */        void onHomeKey();        /**         * 最近任务键         */        void onRecentApps();    }    public void setOnSystemKeyListener(OnSystemKeyListener listener){        mOnSystemKeyListener = listener;    }    /**     * 注册     */    public void register() {        //Log.v(TAG, "---register---");        if(mSystemKeyReceiver == null){            mSystemKeyReceiver = new SystemKeyReceiver();        }        IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        mContext.registerReceiver(mSystemKeyReceiver, homeFilter);    }    /**     * 注销     */    public void unregister() {        //Log.v(TAG, "---unregister---");        if (mSystemKeyReceiver != null) {            mContext.unregisterReceiver(mSystemKeyReceiver);            mSystemKeyReceiver = null;        }    }    /**     * Home键监听内部类     */    class SystemKeyReceiver extends BroadcastReceiver {        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();            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);                //Log.v(TAG, "---onReceive=---reason:" + reason);                if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {//短按Home键                    if(mOnSystemKeyListener != null){                        mOnSystemKeyListener.onHomeKey();                    }                } else if (SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {//最近任务键                    if(mOnSystemKeyListener != null){                        mOnSystemKeyListener.onRecentApps();                    }                } else if (SYSTEM_DIALOG_REASON_LOCK.equals(reason)) {//锁屏                } else if (SYSTEM_DIALOG_REASON_ASSIST.equals(reason)) {//samsung长按Home键                }            }        }    }}
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