Android Handler 防内存泄漏

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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;
                }
            }
        }
    }
}

Android Handler 防内存泄漏

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原文地址：http://www.cnblogs.com/----------/p/5370623.html