用xutils3.0進行下載，xutils3.0進行下載

用xutils3.0進行下載，xutils3.0進行下載

寫的例子比較簡單，是用xutils3.0來進行下載項目更新

1.先通過網路請求，判斷版本是否要更新

2.若要更新，則彈出一個彈窗，我用的是系統內建的Dialog，將下載的版本號碼及下載的內容提示展示出來

3.當使用者點擊下載時，開始下載，下載時展示一個水平的進度條

4.下載完成後，進度條消失，調用系統安裝apk

如下是代碼  用到的xutils的jar包是3.3.32版本的

  1 package com.item.weixin;  2   3 import java.io.File;  4   5 import org.json.JSONException;  6 import org.json.JSONObject;  7 import org.xutils.x;  8 import org.xutils.common.Callback;  9 import org.xutils.http.RequestParams; 10  11 import android.annotation.SuppressLint; 12 import android.app.Activity; 13 import android.app.AlertDialog; 14 import android.app.ProgressDialog; 15 import android.content.Context; 16 import android.content.DialogInterface; 17 import android.content.Intent; 18 import android.content.pm.PackageInfo; 19 import android.content.pm.PackageManager.NameNotFoundException; 20 import android.net.Uri; 21 import android.os.Bundle; 22 import android.os.Environment; 23 import android.view.View; 24 import android.view.Window; 25 import android.widget.Button; 26  27 /** 28  * 設定xutils下載 29  *  30  * @author Administrator 31  *  32  */ 33 public class LoginActivity extends Activity { 34     private Button ll_update; 35     private ProgressDialog pDialog; 36     private String nowVersion; 37     private ProgressDialog progressDialog; 38  39     @Override 40     protected void onCreate(Bundle savedInstanceState) { 41         // TODO Auto-generated method stub 42         super.onCreate(savedInstanceState); 43         requestWindowFeature(Window.FEATURE_NO_TITLE); 44         setContentView(R.layout.activity_login); 45         ll_update = (Button) findViewById(R.id.btn_login); 46         ll_update.setOnClickListener(new View.OnClickListener() { 47  48             @Override 49             public void onClick(View arg0) { 50                 // TODO Auto-generated method stub 51                 checkUpdate(); 52             } 53         }); 54         try { 55             PackageInfo packageInfo = getPackageManager().getPackageInfo( 56                     getPackageName(), 0); 57             nowVersion = packageInfo.versionName; 58         } catch (NameNotFoundException e) { 59             // TODO Auto-generated catch block 60             e.printStackTrace(); 61         } 62     } 63  64     /** 65      * 下載更新, 66      */ 67     protected void checkUpdate() { 68         // TODO Auto-generated method stub 69         proDialogShow(LoginActivity.this, "正在查詢..."); 70         RequestParams params = new RequestParams("url"); 71         x.http().get(params, new Callback.CommonCallback<String>() { 72  73             @Override 74             public void onCancelled(CancelledException arg0) { 75                 // TODO Auto-generated method stub 76  77             } 78  79             @Override 80             public void onError(Throwable arg0, boolean arg1) { 81                 // TODO Auto-generated method stub 82                 PDialogHide(); 83                 System.out.println("提示網路錯誤"); 84             } 85  86             @Override 87             public void onFinished() { 88                 // TODO Auto-generated method stub 89  90             } 91  92             @Override 93             public void onSuccess(String arg0) { 94                 // TODO Auto-generated method stub 95                 PDialogHide(); 96                 try { 97                     JSONObject object = new JSONObject(arg0); 98                     boolean success = object.getBoolean("succee"); 99                     if (success) {100                         String desc = object.getString("desc");101                         String downloadurl = object.getString("downloadurl");102                         String versionname = object.getString("versionname");103                         if (nowVersion.equals(versionname)) {104                             System.out.println("目前的版本為最新，不用跟新");105                         } else {106                             // 不同，彈出更新提示對話方塊107                             setUpDialog(versionname, downloadurl, desc);108                         }109                     }110                 } catch (JSONException e) {111                     // TODO Auto-generated catch block112                     e.printStackTrace();113                 }114             }115         });116     }117 118     /**119      * 120      * @param versionname121      *            地址中版本的名字122      * @param downloadurl123      *            下載包的地址124      * @param desc125      *            版本的描述126      */127     protected void setUpDialog(String versionname, final String downloadurl,128             String desc) {129         // TODO Auto-generated method stub130         AlertDialog dialog = new AlertDialog.Builder(this).setCancelable(false)131                 .setTitle("下載" + versionname + "版本").setMessage(desc)132                 .setNegativeButton("取消", null)133                 .setPositiveButton("下載", new DialogInterface.OnClickListener() {134 135                     @Override136                     public void onClick(DialogInterface arg0, int arg1) {137                         // TODO Auto-generated method stub138                         setDownLoad(downloadurl);139                     }140                 }).create();141         dialog.show();142     }143 144     /**145      * 下載包146      * 147      * @param downloadurl148      *            下載的url149      * 150      */151     @SuppressLint("SdCardPath")152     protected void setDownLoad(String downloadurl) {153         // TODO Auto-generated method stub154         RequestParams params = new RequestParams(downloadurl);155         params.setAutoRename(true);//斷點下載156         params.setSaveFilePath("/mnt/sdcard/demo.apk");157         x.http().get(params, new Callback.ProgressCallback<File>() {158 159             @Override160             public void onCancelled(CancelledException arg0) {161                 // TODO Auto-generated method stub162                 163             }164 165             @Override166             public void onError(Throwable arg0, boolean arg1) {167                 // TODO Auto-generated method stub168                 if(progressDialog!=null && progressDialog.isShowing()){169                     progressDialog.dismiss();170                 }171                 System.out.println("提示更新失敗");172             }173 174             @Override175             public void onFinished() {176                 // TODO Auto-generated method stub177                 178             }179 180             @Override181             public void onSuccess(File arg0) {182                 // TODO Auto-generated method stub183                 if(progressDialog!=null && progressDialog.isShowing()){184                     progressDialog.dismiss();185                 }186                 Intent intent = new Intent(Intent.ACTION_VIEW);187                 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);188                 intent.setDataAndType(Uri.fromFile(new File(Environment189                         .getExternalStorageDirectory(), "demo.apk")),190                         "application/vnd.android.package-archive");191                 startActivity(intent);192             }193 194             @Override195             public void onLoading(long arg0, long arg1, boolean arg2) {196                 // TODO Auto-generated method stub197                 progressDialog.setMax((int)arg0);198                 progressDialog.setProgress((int)arg1);199             }200 201             @Override202             public void onStarted() {203                 // TODO Auto-generated method stub204                 System.out.println("開始下載");205                 progressDialog = new ProgressDialog(LoginActivity.this);206                 progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);//設定為水平進行條207                 progressDialog.setMessage("正在下載中...");208                 progressDialog.setProgress(0);209                 progressDialog.show();210             }211 212             @Override213             public void onWaiting() {214                 // TODO Auto-generated method stub215                 216             }217         });218     }219 220     private void proDialogShow(Context context, String msg) {221         pDialog = new ProgressDialog(context);222         pDialog.setMessage(msg);223         // pDialog.setCancelable(false);224         pDialog.show();225     }226 227     private void PDialogHide() {228         try {229             if (pDialog != null && pDialog.isShowing()) {230                 pDialog.dismiss();231             }232         } catch (Exception e) {233             e.printStackTrace();234         }235     }236 }