使用第三方框架xUtils2进行下载

AndroidManifest.xml中添加权限

 <uses-permission android:name="android.permission.INTERNET"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.msi.xutils.MainActivity">


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="下载"
        android:onClick="click"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_failure"/>

    <ProgressBar
        android:id="@+id/pb_download"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@android:style/Widget.ProgressBar.Horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_progressBar"/>
</LinearLayout>

　　

MainActivity代码

package com.example.msi.xutils;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;

import java.io.File;

public class MainActivity extends AppCompatActivity {


    private TextView tv_failure;
    private TextView tv_pargressBar;
    private ProgressBar pb_download;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_failure = (TextView) findViewById(R.id.tv_failure);
        tv_pargressBar = (TextView) findViewById(R.id.tv_progressBar);
        pb_download = (ProgressBar) findViewById(R.id.pb_download);
    }


    public void click(View v){
        HttpUtils http = new HttpUtils();
        String fileName = "TeamViewer.exe";
        String webPath = "http://172.17.11.161:8080/" + fileName;


        http.download(webPath,//下载地址
                "sdcard/TeamViewer.exe",//文件保存路径
                true,//断点续传
                true, //自动重命名
                new RequestCallBack<File>() {

                    @Override
                    public void onSuccess(ResponseInfo<File> responseInfo) {
                        Toast.makeText(MainActivity.this,responseInfo.result.getPath(),Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onLoading(long total, long current, boolean isUploading) {
                        super.onLoading(total, current, isUploading);
                        tv_pargressBar.setText(current * 100 /total + "%");
                        pb_download.setMax((int)total);
                        pb_download.setProgress((int)current);
                    }

                    @Override
                    public void onFailure(HttpException e, String s) {
                        tv_failure.setText(s);
                    }

        });
    }
}