Android 一步一步实现版本自动更新（第二步下载和安装apk）

来源：互联网发布：淘宝买伟哥编辑：程序博客网时间：2024/04/30 13:01

上一节，通过解析XML文件来比对版本号信息，接着开始下载和安装apk。

将要安装的apk文件通过tomcat发布，如下：

<appversion>10003</appversion>
<appfilename>ProjectProgressManager.apk</appfilename>
<appurl>http://192.168.11.106:8080/versionupdatedir/ProjectProgressManager.apk</appurl>
</xml>

xml文件用来定义版本号，apk文件名和下载链接，通过解析这些信息可以获得下载所需的信息。

上一节在比对版本需要升级后点击确定只是弹出了一个toast，这里将实现点击确定后的下载和自动安装。

public void checkappversion() {

  checkversionProgressDialog = CustomProgressDialog
    .createDialog(ChooseAliveServer.this);
  checkversionProgressDialog.setCancelable(false);
  checkversionProgressDialog.setTitile("正在检查版本更新信息");
  checkversionProgressDialog.setMessage("正在检查版本更新信息.....");
  checkversionProgressDialog.show();

if (isAppNeedUpdate()) {
checkversionProgressDialog.dismiss();

   final AlertDialog appversionAlertDialog = new AlertDialog.Builder(
     ChooseAliveServer.this).create();
   appversionAlertDialog.show();
   appversionAlertDialog
     .setContentView(R.layout.customer_alertdialog_model01);
   appversionAlertDialog.setCancelable(false);
   TextView successtitle = (TextView) appversionAlertDialog
     .findViewById(R.id.cs_alert_01_title);
   successtitle.setText("更新提示");
   TextView successcontent = (TextView) appversionAlertDialog
     .findViewById(R.id.cs_alert_01_content);
   successcontent.setText("当前版本号为" + currentversioncode + ",最新版本号为"
     + updateversioncode + ",点击确定进行更新！");
   appversionAlertDialog

.findViewById((R.id.cs_alert_01_yes)).setOnClickListener(
new OnClickListener() {

      @Override
      public void onClick(View v) {
       // TODO
       // Auto-generated
       // method
       // stub
       /*
        * Toast.makeText(ChooseAliveServer.this, "您选择了更新！",
        * Toast.LENGTH_LONG).show();
        */
       // 点击确定弹出下载进度条
       showdownloadprogress();

appversionAlertDialog.dismiss();

      }
     });

//编写apk下载进度条：

private void showdownloadprogress() {
  AlertDialog.Builder downloadpgBuilder = new Builder(this);
  downloadpgBuilder.setTitle("正在下载文件包" + apkFilename + apkDownloadUrl);
  final LayoutInflater inflater = LayoutInflater
    .from(ChooseAliveServer.this);
  View pgView = inflater.inflate(R.layout.softupdate_progress, null);
  download_ProgressBar = (ProgressBar) pgView
    .findViewById(R.id.update_progress);
  downloadpgBuilder.setView(pgView);
  // 点击取消,进度条消失同时将下载参数置为true;
  downloadpgBuilder.setNegativeButton("取消下载",
    new DialogInterface.OnClickListener() {

     @Override
     public void onClick(DialogInterface dialog, int which) {
      // TODO Auto-generated method stub
      dialog.dismiss();
      Download_cancle = true;

     }
    });
  downloaDialog = downloadpgBuilder.create();
  downloaDialog.setCancelable(false);
  downloaDialog.show();
  downloadApk(apkDownloadUrl);
}

public void downloadApk(String downloadURL) {
class downloadApkThread extends Thread {

   public void run() {
    // 判断sd卡是否存在，并且是否具有读写权限
    if (Environment.getExternalStorageState().equals(
      Environment.MEDIA_MOUNTED)) {
     // 获取sd卡的路径
     String sdpath = Environment.getExternalStorageDirectory()
       + "/";
     apksavepath = sdpath + "download";
     URL downloadapkUrl = null;
     HttpURLConnection downloadapk_Connection = null;
     int apklength = 0;
     File filepath = new File(apksavepath);
     if (!filepath.exists()) {
      filepath.mkdir();
      System.out.println("xxxxxxxxxxxxxxx" + apksavepath
        + "create");
     }
     if (filepath.exists()) {
      System.out.println("xxxxxxxxxxxxxxx" + apksavepath
        + " is exist");
     }
     File apkFile = new File(apksavepath, apkFilename);
        if (apkFile.exists()) {

apkFile.delete();

}
try {

      downloadapkUrl = new URL(apkDownloadUrl);
     } catch (MalformedURLException e1) {
      // TODO Auto-generated catch block
      e1.printStackTrace();
     }

     try {
      downloadapk_Connection = (HttpURLConnection) downloadapkUrl
        .openConnection();
      downloadapk_Connection.connect();
      apklength = downloadapk_Connection.getContentLength();
      apkdownInputStream = downloadapk_Connection
        .getInputStream();

apkdownloadFileOutputStream = new FileOutputStream(
apkFile);

     } catch (Exception e) {
      // TODO: handle exception
     }
     int apkcount = 0;
     byte[] buffer = new byte[1024];

     do {
      int numread;
      try {
       numread = apkdownInputStream.read(buffer);
       apkcount += numread;
       // 计算进度条位置
       Download_progress = (int) (((float) apkcount / apklength) * 100);
       // 更新进度
       downloadHandler.sendEmptyMessage(Downloading);
       if (numread <= 0) {
        // 下载完成
        downloadHandler
          .sendEmptyMessage(Download_Finish);
        break;
       }
       // 写入文件
       apkdownloadFileOutputStream.write(buffer, 0,
         numread);
      } catch (IOException e1) {
       // TODO Auto-generated catch block
       e1.printStackTrace();
      }

     } while (!Download_cancle && !Download_finished);// 点击取消或下载完成就停止下载.
     try {
      apkdownloadFileOutputStream.close();
      apkdownInputStream.close();

     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }

}

    else {
     Toast.makeText(ChooseAliveServer.this, "请确认SD卡已经插上并有读写权限！",
       Toast.LENGTH_LONG).show();
    }

}

}
new downloadApkThread().start();
}

//安装apk

private void installApk() {
  File apkFile = new File(apksavepath, apkFilename);
  if (!apkFile.exists()) {
   return;
  }
  Intent install_Intent = new Intent(Intent.ACTION_VIEW);
  install_Intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  install_Intent.setDataAndType(
    Uri.parse("file://" + apkFile.toString()),
    "application/vnd.android.package-archive");
  ChooseAliveServer.this.startActivity(install_Intent);

// ChooseAliveServer为activity的类名

  /*File installapkFile = new File(apksavepath, apkFilename);
  if (!installapkFile.exists()) {
   return;
  }
  Intent install_Intent = new Intent();

  install_Intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  install_Intent.setAction(Intent.ACTION_VIEW);
  String typeString="application/vnd.android.package-archive";
  install_Intent.setDataAndType(Uri.fromFile(installapkFile), typeString);
  startActivity(install_Intent);*/
}

进度条所需的xml文件 R.layout.softupdate_progress：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ProgressBar
  android:id="@+id/update_progress"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  style="?android:attr/progressBarStyleHorizontal" />
</LinearLayout>

当然不要忘了给相应
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

R.layout.customer_alertdialog_model01如下：

</LinearLayout>

效果如下：

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Android 一步一步实现版本自动更新（第二步 下载和安装apk）

Android 一步一步实现版本自动更新（第二步下载和安装apk）