android - 如何将上传的服务器文件版本与安卓市场上的应用程序版本进行比较

Question

每当用户启动我的应用程序时，我都会尝试在 24 小时后检查和更新 Android 应用程序，我已经编写了此代码，但它不起作用，它没有显示任何可用更新的消息。

我在服务器上上传了一个 txt 文件，我刚刚写了 3 作为版本号，我命名了这个文件版本，这个文件的路径是 www.mywebsite.com/upload。version.txt 文件存在于上传目录中。当我运行此应用程序时，我没有收到任何关于模拟器中可用更新的对话消息。请帮我找出问题所在。我是android开发的新手。预先感谢。

package com.test;

import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import java.io.InputStream;
import java.io.BufferedInputStream;
import android.net.Uri;



public class TestActivity extends Activity {
    private Handler mHandler;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mHandler = new Handler();

        SharedPreferences prefs = getPreferences(0);
        long lastUpdateTime = prefs.getLong("lastUpdateTime", 0);

        /* Should Activity Check for Updates Now? */
        if ((lastUpdateTime + (24 * 60 * 60 * 1000)) < System.currentTimeMillis()) {

            /* Save current timestamp for next Check*/
            lastUpdateTime = System.currentTimeMillis();            
            SharedPreferences.Editor editor = getPreferences(0).edit();
            editor.putLong("lastUpdateTime", lastUpdateTime);
            editor.commit();        

            Thread checkUpdate = null;
            /* Start Update */            
            checkUpdate.start();

            /* This Thread checks for Updates in the Background */
            Thread checkUpdatee = new Thread() {
                public void run() {
                    try {
                        URL updateURL = new URL("http://mywebsite.com/update");                
                        URLConnection conn = updateURL.openConnection(); 
                        InputStream is = conn.getInputStream();
                        BufferedInputStream bis = new BufferedInputStream(is);
                        ByteArrayBuffer baf = new ByteArrayBuffer(50);

                        int current = 0;
                        while((current = bis.read()) != -1){
                             baf.append((byte)current);
                        }

                        /* Convert the Bytes read to a String. */
                        final String s = new String(baf.toByteArray());         

                        /* Get current Version Number */
                        int curVersion = getPackageManager().getPackageInfo("com.test", 0).versionCode;
                        int newVersion = Integer.valueOf(s);

                        /* Is a higher version than the current already out? */
                        if (newVersion > curVersion) {
                            Runnable showUpdate = null;
                            /* Post a Handler for the UI to pick up and open the Dialog */
                            mHandler.post(showUpdate);
                        }                
                    } catch (Exception e) {
                    }
                }
            };

            /* This Runnable creates a Dialog and asks the user to open the Market */ 
            Runnable showUpdate = new Runnable(){
                   public void run(){
                    new AlertDialog.Builder(TestActivity.this)

                    .setTitle("Update Available")
                    .setMessage("An update for is available!\\n\\nOpen Android Market and see the details?")
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                                    /* User clicked OK so do some stuff */
                                    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q=pname:com.test"));
                                    startActivity(intent);
                            }
                    })
                    .setNegativeButton("No", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                                    /* User clicked Cancel */
                            }
                    })
                    .show();
                   }
            };    


        }




    }
}