android 自動檢測版本升級

在我們APP的開發中,往往都會遇到版本的升級,因為不可能有任何一個應用做的完美無缺,所以版本升級對APP應用來說是不可缺少的一部分.像新浪微博等一些應用軟件,三天兩頭提醒我升級.不過這樣也很正常,就像android 升級一樣,為瞭給用戶提供更方便更人性化的操作.說下具體實現吧,不過我是參考別人的。不管對你們有沒有幫助,總之對我有幫助啊,如果日後用到就直接copy瞭.哈哈,不扯瞭。
首先看一個文件manifest文件.
[java] 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.jj.upgrade" 
    android:versionCode="1" 
    android:versionName="1.0" > 
我們可以很清楚的看到versionCode和versionName,我們一般用versionCode來實現,
實現原理很簡單:服務器端有個serverVersion,我們本地有個localVersion.服務器端serverVersion>localVersion,這個時候我們就需要進行升級版本.原理大致就是這樣。具體實現請看下面.
[java] 
package com.jj.upgrade; 
 
import com.jj.Service.UpdateService; 
 
import android.app.AlertDialog; 
import android.app.Application; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager.NameNotFoundException; 
 
/***
 * MyApplication
 * 
 * @author zhangjia
 * 
 */ 
public class MyApplication extends Application { 
 
    public static int localVersion = 0;// 本地安裝版本 
 
    public static int serverVersion = 2;// 服務器版本 
 
    public static String downloadDir = "jj/";// 安裝目錄 
 
    @Override 
    public void onCreate() { 
        super.onCreate(); 
        try { 
            PackageInfo packageInfo = getApplicationContext() 
                    .getPackageManager().getPackageInfo(getPackageName(), 0); 
            localVersion = packageInfo.versionCode; 
        } catch (NameNotFoundException e) { 
            e.printStackTrace(); 
        } 
 
        /***
         * 在這裡寫一個方法用於請求獲取服務器端的serverVersion.
         */ 
 
    } 
 

我們一般把全局的東西放到application裡面.
[java] 
public class MainActivity extends Activity { 
    private MyApplication myApplication; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
         
        checkVersion(); 
    } 
 
    /***
     * 檢查是否更新版本
     */ 
    public void checkVersion() { 
        myApplication = (MyApplication) getApplication(); 
        if (myApplication.localVersion < myApplication.serverVersion) { 
 
            // 發現新版本,提示用戶更新 
            AlertDialog.Builder alert = new AlertDialog.Builder(this); 
            alert.setTitle("軟件升級") 
                    .setMessage("發現新版本,建議立即更新使用.") 
                    .setPositiveButton("更新", 
                            new DialogInterface.OnClickListener() { 
                                public void onClick(DialogInterface dialog, 
                                        int which) { 
                                    Intent updateIntent = new Intent( 
                                            MainActivity.this, 
                                            UpdateService.class); 
                                    updateIntent.putExtra( 
                                            "app_name", 
                                            getResources().getString( 
                                                    R.string.app_name)); 
                                    startService(updateIntent); 
                                } 
                            }) 
                    .setNegativeButton("取消", 
                            new DialogInterface.OnClickListener() { 
                                public void onClick(DialogInterface dialog, 
                                        int which) { 
                                    dialog.dismiss(); 
                                } 
                            }); 
            alert.create().show(); 
 
        } 
    } 

我們在運行應用的時候要checkVersion();進行檢查版本是否要進行升級.
最主要的是UpdateService服務類,
[java] 
@Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
 
        app_name = intent.getStringExtra("app_name"); 
        // 創建文件 
        FileUtil.createFile(app_name);// 創建文件 
 
        createNotification();// 首次創建 
 
        createThread();// 線程下載 
 
        return super.onStartCommand(intent, flags, startId); 
 
    } 
創建路徑及文件,這裡就不介紹瞭,不明白瞭下載源碼看.
首先我們先 看createNotification().這個方法:
[java]
/***
     * 創建通知欄
     */ 
    RemoteViews contentView; 
    public void createNotification() { 
        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
        notification = new Notification(); 
        notification.icon = R.drawable.ic_launcher;// 這個圖標必須要設置,不然下面那個RemoteViews不起作用. 
        // 這個參數是通知提示閃出來的值. 
        notification.tickerText = "開始下載"; 
        // 
        // updateIntent = new Intent(this, MainActivity.class); 
        // pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0); 
        // 
        // // 這裡面的參數是通知欄view顯示的內容 
        // notification.setLatestEventInfo(this, app_name, "下載:0%", 
        // pendingIntent); 
        // 
        // notificationManager.notify(notification_id, notification); 
 
        /***
         * 在這裡我們用自定的view來顯示Notification
         */ 
        contentView = new RemoteViews(getPackageName(), 
                R.layout.notification_item); 
        contentView.setTextViewText(R.id.notificationTitle, "正在下載"); 
        contentView.setTextViewText(R.id.notificationPercent, "0%"); 
        contentView.setProgressBar(R.id.notificationProgress, 100, 0, false); 
 
        notification.contentView = contentView; 
 
        updateIntent = new Intent(this, MainActivity.class); 
        updateIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); 
        pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0); 
 
        notification.contentIntent = pendingIntent; 
 
        notificationManager.notify(notification_id, notification); 
 
    } 
上面實現的也不難理解.(主要是初始化Notification,用於提醒用戶開始下載)
接著我們要看createThread方法
[java] 
/***
     * 開線程下載
     */ 
    public void createThread() { 
        /***
         * 更新UI
         */ 
        final Handler handler = new Handler() { 
            @Override 
            public void handleMessage(Message msg) { 
                switch (msg.what) { 
                case DOWN_OK: 
                    // 下載完成,點擊安裝 
                    Uri uri = Uri.fromFile(FileUtil.updateFile); 
                    Intent intent = new Intent(Intent.ACTION_VIEW); 
                    intent.setDataAndType(uri, 
                            "application/vnd.android.package-archive"); 
 
                    pendingIntent = PendingIntent.getActivity( 
                            UpdateService.this, 0, intent, 0); 
 
                    notification.setLatestEventInfo(UpdateService.this, 
                            app_name, "下載成功,點擊安裝", pendingIntent); 
 
                    notificationManager.notify(notification_id, notification); 
 
                    stopSelf(); 
                    break; 
                case DOWN_ERROR: 
                    notification.setLatestEventInfo(UpdateService.this, 
                            app_name, "下載失敗", pendingIntent); 
                    break; 
 
                default: 
                    stopSelf(); 
                    break; 
                } 
 
            } 
 
        }; 
 
        final Message message = new Message(); 
 
        new Thread(new Runnable() { 
            @Override 
            public void run() { 
 
                try { 
                    long downloadSize = downloadUpdateFile(down_url, 
                            FileUtil.updateFile.toString()); 
                    if (downloadSize > 0) { 
                        // 下載成功 
                        message.what = DOWN_OK; 
                        handler.sendMessage(message); 
                    } 
 
                } catch (Exception e) { 
                    e.printStackTrace(); 
                    message.what = DOWN_ERROR; 
                    handler.sendMessage(message); 
                } 
 
            } 
        }).start(); 
    } 
這個方法有點小多,不過我想大傢都看的明白,我在這裡簡單說名一下:首先我們創建一個handler用於檢測最後下載ok還是not ok.
下面我們開啟瞭線程進行下載數據。
我們接著看downloadUpdateFile這個方法:
[java] 
/***
     * 下載文件
     * 
     * @return
     * @throws MalformedURLException
     */ 
    public long downloadUpdateFile(String down_url, String file) 
            throws Exception { 
        int down_step = 5;// 提示step 
        int totalSize;// 文件總大小 
        int downloadCount = 0;// 已經下載好的大小 
        int updateCount = 0;// 已經上傳的文件大小 
        InputStream inputStream; 
        OutputStream outputStream; 
 
        URL url = new URL(down_url); 
        HttpURLConnection httpURLConnection = (HttpURLConnection) url 
                .openConnection(); 
        httpURLConnection.setConnectTimeout(TIMEOUT); 
        httpURLConnection.setReadTimeout(TIMEOUT); 
        // 獲取下載文件的size 
        totalSize = httpURLConnection.getContentLength(); 
        if (httpURLConnection.getResponseCode() == 404) { 
            throw new Exception("fail!"); 
        } 
        inputStream = httpURLConnection.getInputStream(); 
        outputStream = new FileOutputStream(file, false);// 文件存在則覆蓋掉 
        byte buffer[] = new byte[1024]; 
        int readsize = 0; 
        while ((readsize = inputStream.read(buffer)) != -1) { 
            outputStream.write(buffer, 0, readsize); 
            downloadCount += readsize;// 時時獲取下載到的大小 
            /**
             * 每次增張5%
             */ 
            if (updateCount == 0 
                    || (downloadCount * 100 / totalSize – down_step) >= updateCount) { 
                updateCount += down_step; 
                // 改變通知欄 
                // notification.setLatestEventInfo(this, "正在下載…", updateCount 
                // + "%" + "", pendingIntent); 
                contentView.setTextViewText(R.id.notificationPercent, 
                        updateCount + "%"); 
                contentView.setProgressBar(R.id.notificationProgress, 100, 
                        updateCount, false); 
                // show_view 
                notificationManager.notify(notification_id, notification); 
 
            } 
 
        } 
        if (httpURLConnection != null) { 
            httpURLConnection.disconnect(); 
        } 
        inputStream.close(); 
        outputStream.close(); 
 
        return downloadCount; 
 
    } 
註釋已經寫的很詳細,相信大傢都看的明白,如果哪裡有不足的地方,請留您吉言指出.
 這裡我用別的app代替瞭,簡單省事,正常的話,你要對你的APP進行數字簽名.然後才可以進行升級應用.
示意圖:
      

                    

          提示有新版                                       開始升級                                        升級下載中                                  下載完畢,點擊安裝

 

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