android 断点下载---XUtils

配置权限

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1 2	<uses-permission android:name="android.permission.INTERNET"/>     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

　　/MainActivity.java

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package com.bawei.myxutils;   import java.io.File; import java.math.BigDecimal;   import android.app.Activity; import android.os.Bundle; import android.os.Environment; 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.HttpHandler; import com.lidroid.xutils.http.ResponseInfo; import com.lidroid.xutils.http.callback.RequestCallBack;   public class MainActivity extends Activity {       private ProgressBar pb;     private TextView text1;     private TextView text2;     private String path;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         pb = (ProgressBar) findViewById(R.id.progressBar1);// 进度条         text1 = (TextView) findViewById(R.id.text1);// 显示当前下载了多少         text2 = (TextView) findViewById(R.id.text2);// 显示下载总大小         path = Environment.getExternalStorageDirectory().getPath();// 得到SD卡路径         HttpUtils http = new HttpUtils();         /**          * url 下载的路径 target 下载文件保存的路径 autoResume 是否支持断点续传          */         HttpHandler handler = http.download(                 "http://101.200.142.201:8080/tqyb/dancer.avi", path                         + "/dancer.avi", true /* 如果目标文件存在，接着未完成的部分继续下载。 */,                 true/* 如果从请求返回信息中获取到文件名，下载完成后自动重命名。 */,                 new RequestCallBack<File>() {                     @Override                     public void onStart() {                         // TODO Auto-generated method stub                         super.onStart();                         Toast.makeText(MainActivity.this, "开始下载", 0).show();                     }                       /**                      * 加载进度 pb为进度条，实现进度条进度加载 total 总得大小 current 当前的大小                      */                     @Override                     public void onLoading(long total, long current,                             boolean isUploading) {                         // TODO Auto-generated method stub                         pb.setMax((int) total);                         pb.setProgress((int) current);                         // 将字节转换成M                         BigDecimal filesize = new BigDecimal(current);                         BigDecimal megabyte = new BigDecimal(1024 * 1024);                         float returnValue = filesize.divide(megabyte, 2,                                 BigDecimal.ROUND_UP).floatValue();                         text1.setText(returnValue + "M");                         // 将字节转换成M                         BigDecimal filesize1 = new BigDecimal(total);                         BigDecimal megabyte1 = new BigDecimal(1024 * 1024);                         float returnValue1 = filesize1.divide(megabyte1, 2,                                 BigDecimal.ROUND_UP).floatValue();                         text2.setText(returnValue1 + "M");                       }                       @Override                     public void onSuccess(ResponseInfo<File> arg0) {                         // TODO Auto-generated method stub                         Toast.makeText(MainActivity.this, "下载成功", 0).show();                     }                       @Override                     public void onFailure(HttpException arg0, String arg1) {                         // TODO Auto-generated method stub                         Toast.makeText(MainActivity.this, "下载失败", 0).show();                     }                 });       }   }

　效果展示