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   源码介绍

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服务器端只需放一个 json文件和一个apk文件即可在线升级app版本，本实例 服务器端的json文件如下 

  {   
        "appName": "精准扶贫", 
        "versionCode": "2", 
        "versionName": "1.0", 
        "apkUrl": "http://www.ailaoxiang.com/fupin.apk", 
        "changeLog":"1.修复xxx Bug;\n2.更新UI界面.", 
        "updateTips": "更新提示" ,
        "forceUpgrade": false    //当有新版本时，APP 将会自动下载安装包
    }

package com.bullsofts.friends.fupin;

import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;

import com.bullsofts.friends.fupin.dummy.DummyContent;
import com.shelwee.update.UpdateHelper;
import com.shelwee.update.listener.OnUpdateListener;
import com.shelwee.update.pojo.UpdateInfo;

public class HomeActivity extends AppCompatActivity implements QueryCenterFragment.OnListFragmentInteractionListener,ApplyFragment.OnFragmentInteractionListener,HomeFragment.OnFragmentInteractionListener {

    private TextView mTextMessage;

    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.navigation_home:
                    mTextMessage.setText(R.string.title_home);
                    setFragment(new HomeFragment());
                    return true;
                case R.id.navigation_dashboard:
                    mTextMessage.setText(R.string.title_dashboard);
                    setFragment(new ApplyFragment());
                    return true;
                case R.id.navigation_notifications:
                    mTextMessage.setText(R.string.title_notifications);
                    setFragment(new QueryCenterFragment());

                    return true;
            }
            return false;
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        //getWindow().setNavigationBarColor(Color.parseColor("#2FA9F1")); //写法一

        mTextMessage = (TextView) findViewById(R.id.message);
        BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

        //在线升级
        UpdateHelper updateHelper = new UpdateHelper.Builder(this)
                .checkUrl("http://www.ailaoxiang.com/apkupdate.json")
                .isAutoInstall(false) //设置为false需在下载完手动点击安装;默认值为true，下载后自动安装。
                .isHintNewVersion(false).build();
        updateHelper.check();

    }

    @Override
    public void onListFragmentInteraction(DummyContent.DummyItem item) {

    }

    protected void setFragment(Fragment fragment) {
        android.support.v4.app.FragmentTransaction t = getSupportFragmentManager().beginTransaction();
        t.replace(R.id.content, fragment);
//        t.addToBackStack(null);
        t.commit();
    }

    @Override
    public void onFragmentInteraction(Uri uri) {

    }
}