home键监听、屏蔽和模拟home键

   /**
     * 模拟按home键
     * 程序退到后台运行
     * @param context
     */
    private void imitatePressHome(Context context)
    {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addCategory(Intent.CATEGORY_HOME);
        context.startActivity(intent);
    }

    /**
     * 注册home键监听
     * @param context
     */
    private void registerHomeReceiver(Context context)
    {
        context.registerReceiver(mHomeKeyEventReceiver, new IntentFilter(
                Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
    }
    /**
     * home键处理
     */
    private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {
        String SYSTEM_REASON = "reason";
        String SYSTEM_HOME_KEY = "homekey";
        String SYSTEM_HOME_KEY_LONG = "recentapps";  

        @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_REASON);
                if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {
                     //表示按了home键,程序到了后台
                    Toast.makeText(context, "home pressed", 1000).show();
                }else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){
                    //表示长按home键,显示最近使用的程序列表
                    Toast.makeText(context, "home long pressed", 1000).show();
                }
            }
        }
    };  

/**
 * home键屏蔽
 */
    @Override
    public void onAttachedToWindow() {
        // TODO Auto-generated method stub
        this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
        super.onAttachedToWindow();
    }

在4.0 以后，无论是在onCreate()还是onAttachedToWindow()中都不能重设window的Type，想用此法屏蔽Home键无效！

4.0以上执行这段代码会报java.lang.IllegalArgumentException: Window type can not be changed after the window is added.至于怎么屏蔽，现在网上还没有很好的解决办法，mtk的到是有解决办法，其他平台的就不行了....除非修改底层框架

mtk的解决办法：

public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;

在onCreate中执行

this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);