Android Handler 防内存泄漏

package com.tv.ui.metro.utils;

import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.View;

import com.thunder.ktv.thunderjni.thunderapi.TDHotspot;import com.tv.ui.metro.MainActivity;import com.tv.ui.metro.model.GenericSubjectItem;import com.tv.ui.metro.model.KtvMainModuleDisplayItem;import com.tv.ui.metro.view.KtvLogoView;

import java.lang.ref.WeakReference;import java.util.ArrayList;

/** * Created by Administrator on 16-4-5. */public class ActivityHelper {    public static class MainHandler extends Handler {

        private static MainHandler _this;        public static final int MAIN_MODULE_JSON_READY = 1;        public static final int LEFT_TOP_HST_READY = 2;        public static String KEY_RAW_JSON = "raw_json";        public static String KEY_LEFT_TOP_LIST = "lt_list";        WeakReference<Activity> mActivityReference;

        MainHandler(Activity activity) {            super(activity.getMainLooper());            mActivityReference = new WeakReference<Activity>(activity);        }

        public static MainHandler getInstance(Activity activity) {            if (_this == null) {                _this = new MainHandler(activity);            }            return _this;        }

        @Override        public void handleMessage(Message msg) {            final MainActivity activity = (MainActivity) mActivityReference.get();            Bundle b;            if (activity != null) {                switch (msg.what) {                    case MAIN_MODULE_JSON_READY:                        Log.d("MainActivity", "handleMessage MAIN_MODULE_JSON_READY");                        //更新UI                        b = msg.getData();                        GenericSubjectItem<KtvMainModuleDisplayItem> json = (GenericSubjectItem<KtvMainModuleDisplayItem>) b.getSerializable(KEY_RAW_JSON);                        activity.updateTabsAndMetroUI(json);                        activity.getTabHost().requestLayout();                        final View tabView = activity.getTabs().getChildTabViewAt(activity.getViewPager().getCurrentItem());                        tabView.post(new Runnable() {                            @Override                            public void run() {                                tabView.requestFocus();                            }                        });                        break;                    case LEFT_TOP_HST_READY:                        Log.d("MainActivity", "handleMessage LEFT_TOP_HST_READY");                        b = msg.getData();                        b.getSerializable(KEY_LEFT_TOP_LIST);                        KtvLogoView lv = activity.getLogoView();                        lv = new KtvLogoView(activity);                        activity.setLogoView(lv);                        lv.setHsList((ArrayList<TDHotspot>) b.getSerializable("lt_list"));                        break;                }            }        }    }}