<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical"

     android:paddingLeft="@dimen/activity_horizontal_margin"

     android:paddingRight="@dimen/activity_horizontal_margin"

     android:paddingTop="@dimen/activity_vertical_margin"

     android:paddingBottom="@dimen/activity_vertical_margin"

     tools:context="com.example.fanlei.mycontentproviderdemo.TrafficActivity">

     <TextView

         android:id="@+id/show_liuliang"

         android:text="@string/hello_world"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content" />

     <Button

         android:id="@+id/btn_scan"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="获取App流量"/>

     <ListView

         android:id="@+id/listView"

         android:layout_width="match_parent"

         android:layout_height="wrap_content">

     </ListView>

 </LinearLayout>

 package com.example.fanlei.mycontentproviderdemo;

 import android.content.pm.PackageInfo;

 import android.content.pm.PackageManager;

 import android.net.TrafficStats;

 import android.os.Bundle;

 import android.support.v7.app.ActionBarActivity;

 import android.view.View;

 import android.widget.Button;

 import android.widget.ListView;

 import android.widget.SimpleAdapter;

 import android.widget.TextView;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 public class TrafficActivity extends ActionBarActivity {

     private TextView show_liuliang;//显示流量

     private Button   btn_scan;

     private ListView listView;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_traffic_activity);

         show_liuliang = (TextView) findViewById(R.id.show_liuliang);

         listView      = (ListView) findViewById(R.id.listView);

         btn_scan      = (Button) findViewById(R.id.btn_scan);

         long mrb = TrafficStats.getMobileRxBytes();   //手机接收的字节数,非WiFi状态

         long mtb = TrafficStats.getMobileTxBytes();   //手机发送的字节数，非WiFi状态

         long tMrb = TrafficStats.getTotalRxBytes();   //全部接收的字节数

         long tMtb = TrafficStats.getTotalTxBytes();   //全部发送的字节数

         StringBuilder sb = new StringBuilder();

         sb.append("非WiFi总接受:").append(byteToMB(mrb));

         sb.append("非WiFi总发送:").append(byteToMB(mtb));

         sb.append("全部接收:").append(byteToMB(tMrb));

         sb.append("全部发送:").append(byteToMB(tMtb));

         show_liuliang.setText(sb.toString());//显示

         btn_scan.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 PackageManager pm = getPackageManager();             //拿到包管理者

                 //拿到包的信息  PackageInfo是系统的一个类

                 List<PackageInfo> info = pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES

                                                                  |PackageManager.GET_PERMISSIONS);

                 List<Map<String,String>> appInfo = new ArrayList<>();//用于存放App的名称，上传和下载的字节

                 /**

                  * 通过看它有没有网络权限权限

                  */

                 for (PackageInfo temp:info){

                     String permissions[] = temp.requestedPermissions;    //拿到该包的权限

                     if (permissions!= null && permissions.length > 0){   //如果有权限

                         for (String p : permissions){

                             if (p.equals("android.permission.INTERNET")){//是否有网络权限

                                 String appName = temp.applicationInfo.loadLabel(pm).toString();       //App名称

                                 long appMrb    = TrafficStats.getUidRxBytes(temp.applicationInfo.uid);//App接收的字节

                                 long appMtb    = TrafficStats.getUidTxBytes(temp.applicationInfo.uid);//App发送的字节

                                 String str = appName + "下载："+byteToMB(appMrb)+"上传:"+byteToMB(appMtb);

                                 Map<String,String> map = new HashMap<>();

                                 map.put("info",str);

                                 appInfo.add(map);

                             }

                         }

                     }

                 }

                 SimpleAdapter simpleAdapter = new SimpleAdapter(getBaseContext(),

                         appInfo,

                         android.R.layout.simple_list_item_1,

                         new String[]{"info"},

                         new int[]{android.R.id.text1});

                 listView.setAdapter(simpleAdapter);//设置Adapter

             }

         });

     }

     //将字节数转化为MB

     private String byteToMB(long size){

         long kb = 1024;

         long mb = kb*1024;

         long gb = mb*1024;

         if (size >= gb){

             return String.format("%.1f GB",(float)size/gb);

         }else if (size >= mb){

             float f = (float) size/mb;

             return String.format(f > 100 ?"%.0f MB":"%.1f MB",f);

         }else if (size > kb){

             float f = (float) size / kb;

             return String.format(f>100?"%.0f KB":"%.1f KB",f);

         }else {

             return String.format("%d B",size);

         }

     }

 }