android_37_使用开源xUtils进行下载

将Jar包copy到libs目录下

效果:

清单:

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.sg31.xutils"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    // 注意权限     <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>        <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

布局:

<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: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.sg31.xutils.MainActivity"     android:orientation="vertical"    >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="下载"         android:onClick="downloadBtnClicked"        />    <TextView        android:id="@+id/tv_failure"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         />    <ProgressBar        android:id="@+id/pb"         android:layout_width="match_parent"        android:layout_height="wrap_content"        style="@android:style/Widget.ProgressBar.Horizontal"        />    <TextView        android:id="@+id/tv_progress"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         /></LinearLayout>

代码:

package com.sg31.xutils;import java.io.File;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 android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends ActionBarActivity {private TextView tv_failure;    private TextView tv_progress;    private ProgressBar pb;            @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                tv_failure = (TextView) findViewById(R.id.tv_failure);        tv_progress = (TextView) findViewById(R.id.tv_progress);        pb = (ProgressBar) findViewById(R.id.pb);            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }            public void downloadBtnClicked(View v){        HttpUtils utils = new HttpUtils();                String fileName = "NEXT_TO_YOU.mp3";          // 确定下载地址          String path = "http://od8vj43og.bkt.clouddn.com/" + fileName;          utils.download(path, //下载地址                       "sdcard/"+fileName, //文件保存路径                       true,//是否支持断点续传                       true, new RequestCallBack<File>() {                                                      //下载成功后调用                           @Override                           public void onSuccess(ResponseInfo<File> arg0) {                               Toast.makeText(MainActivity.this, arg0.result.getPath(), 0).show();                           }                                                      //下载失败调用                           @Override                           public void onFailure(HttpException arg0, String arg1) {                               tv_failure.setText(arg1);                           }                                                      @Override                           public void onLoading(long total, long current,                                                 boolean isUploading) {                               super.onLoading(total, current, isUploading);                               pb.setMax((int)total);                               pb.setProgress((int)current);                               tv_progress.setText(current * 100 / total + "%");                           }                        });    }    }