Android解析XML文件升级APK的方法

安装APK

public class DownLoadApk {
public static SharedPreferences sharedPrederences = null;
//启动安装界面
public static void DownId(Context context, long downId){
 DownloadManager mDownloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
 Uri downloadUri = mDownloadManager.getUriForDownloadedFile(downId);
 startInstall(context, downloadUri);
}
/**
 * 跳转到安装界面
 * @param context 作用域
 * @param uri 包名
 */
private static void startInstall(Context context, Uri uri) {
 Intent install = new Intent(Intent.ACTION_VIEW);
 install.setDataAndType(uri, "application/vnd.android.package-archive");
 install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 context.startActivity(install);
}
//删除文件
public static boolean fileDelete(String filePath) {
 File file = new File(filePath);
 if (file.exists() == false) {
  return false;
 }
 return file.delete();
}

发送请求获取输入流

Thread thread = new Thread() {
@Override
public void run() {
 super.run();
 //XML存放在ftp服务器的地址
 String path = FileUtils.getDevice_address()+"News.XML";
 try {
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection) url
    .openConnection();
  conn.setRequestMethod("GET");
  conn.setConnectTimeout(5000);
  conn.setReadTimeout(5000);
  //发送http GET请求，获取相应码
  if (conn.getResponseCode() == 200) {
   InputStream is = conn.getInputStream();
   //使用pull解析器，开始解析这个流
   parseNewsXml(is);
  }
 } catch (Exception e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
}
};
thread.start();

解析XML文件

private void parseNewsXml(InputStream is) {
XmlPullParser xp = Xml.newPullParser();
try {
 xp.setInput(is, "utf-8");
 //对节点的事件类型进行判断，就可以知道当前节点是什么节点
 int type = xp.getEventType();
 News news = null;
 while (type != XmlPullParser.END_DOCUMENT) {
  switch (type) {
   case XmlPullParser.START_TAG:
    if ("newslist".equals(xp.getName())) {
     newsList = new ArrayList<>();
     break;
    } else if ("news".equals(xp.getName())) {
     news = new News();
     break;
    } else if ("name".equals(xp.getName())) {
     String name = xp.nextText();
     news.setName(name);
     break;
    } else if ("code".equals(xp.getName())) {
     String code = xp.nextText();
     news.setCode(code);
     break;
    }
   case XmlPullParser.END_TAG:
    if ("news".equals(xp.getName())) {
     newsList.add(news);
    }
    break;
    default:
    break;
  }
  //解析完当前节点后，把指针移动至下一个节点，直至节点完毕，并返回它的事件类型
  type = xp.next();
 }
 // 发消息
 handler.sendEmptyMessage(1);
} catch (Exception e) {
 e.printStackTrace();
}
}

可以开始下载

//获取下载管理器
DownloadManager manager =(DownloadManager)mContext.getSystemService(mContext.DOWNLOAD_SERVICE);
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
 super.handleMessage(msg);
 News news = newsList.get(0);
 Log.i("aii", "XML: "+news.getCode()+"，apk:"+getPackageInfo(mContext));
 if(Integer.valueOf(news.getCode())>Integer.valueOf(getPackageInfo(mContext))){
  if(dowmCliek) {
   //开启进度条线程
   isRun = true;
   dowmCliek = false;
   //更新APK前删除原来的安装包
   DownLoadApk.fileDelete(path + "/" + mAPK);
   //创建下载请求
   DownloadManager.Request down = new DownloadManager.Request(
     Uri.parse(mWebsite));
   //设置允许使用的网络类型，这里是移动网络和wifi都可以
   down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
   //禁止发出通知，既后台下载
   down.setShowRunningNotification(true);
   //不显示下载界面
   down.setVisibleInDownloadsUi(true);
   //标题
   down.setDestinationInExternalFilesDir(mContext, null, "XXX升级中...");
   //将下载请求放入队列，返回下载id
   downId = manager.enqueue(down);
  }else{
   Toast.makeText(mContext,"升级中...",Toast.LENGTH_SHORT).show();
  }
 }else{
   Toast.makeText(mContext,"已是最新版本无需升级...",Toast.LENGTH_SHORT).show();
 }
}
};

跟踪下载进度

//定时任务
ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1);
scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
  @Override
  public void run() {
   if(isRun) {
    Message msg = mHandler.obtainMessage();
    msg.what = 1;
    mHandler.sendMessage(msg);
   }
  }
 }, 0, 100, TimeUnit.MILLISECONDS);//延迟0，间隔100，单位毫秒
private Handler mHandler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
 switch (msg.what) {
  case 1:
   //android下载管理器
   DownloadManager.Query query = new DownloadManager.Query().setFilterById(downId);
   Cursor cursor = manager.query(query);
   if (cursor != null && cursor.moveToFirst()) {
    //此处直接查询文件大小
    long downSize = cursor.getLong(cursor.getColumnIndex(
      DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
    //获取文件下载总大小
    fileTotalSize =cursor.getLong(cursor.getColumnIndex(
      DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
    cursor.close();

Log.w("打印", "总大小" + downSize);
    Log.w("打印", "下载进度 " + fileTotalSize);
    if (fileTotalSize>0) {
     NumberFormat numberFormat = NumberFormat.getInstance();
     numberFormat.setMaximumFractionDigits(2);
     String result = numberFormat.format((float)fileTotalSize/(float)downSize*100);
     Log.w("打印", "downloaded size: " + result+"％");
     downBtn.setText(result+"％");
    }
    //下载完毕
    if(fileTotalSize==downSize) {
     isRun = false;
     downBtn.setText("点击升级");
    }
   }
 }
 return true;
}
});

 下载完毕启动安装

DownloadCompleteReceiver receiver = new DownloadCompleteReceiver();
//下载完成后的广播
class DownloadCompleteReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
 if(intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)){
  long downId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
  if(downId!=-1) {
   //启动安装
   DownLoadApk.DownId(context,downId);
   dowmCliek=true;
  }
 }else{
  Toast.makeText(context, intent.getAction()+"下载失败", Toast.LENGTH_SHORT).show();
 }
}
}
//启动下载完成广播
mContext.registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

获取项目包名

private static String getPackageInfo(Context context) {
PackageInfo pi = null;
try {
 PackageManager pm = context.getPackageManager();
 pi = pm.getPackageInfo(context.getPackageName(),
   PackageManager.GET_CONFIGURATIONS);
 return pi.versionCode+"";
} catch (Exception e) {
 e.printStackTrace();
}
return null;
}

总结

以上所述是小编给大家介绍的Android解析XML文件升级APK的方法网站的支持！

来源：https://www.cnblogs.com/94xiyang/archive/2018/07/30/9389881.html