android应用实现自动检测版本升级
在我们APP的开发中,往往都会遇到版本的升级,因为不可能有任何一个应用做的完美无缺,所以版本升级对APP应用来说是不可缺少的一部分.像新浪微博等一些应用软件,三天两头提醒我升级.不过这样也很正常,就像android 升级一样,为了给用户提供更方便更人性化的操作.说下具体实现吧,不过我是参考别人的。不管对你们有没有帮助,总之对我有帮助啊,如果日后用到就直接copy了.哈哈,不扯了。
首先看一个文件manifest文件:
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< manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.jj.upgrade" android:versioncode = "1" android:versionname = "1.0" > </ manifest > |
我们可以很清楚的看到versionCode和versionName,我们一般用versionCode来实现, 实现原理很简单:服务器端有个serverVersion,我们本地有个localVersion.服务器端serverVersion>localVersion,这个时候我们就需要进行升级版本.原理大致就是这样。
具体实现请看下面:
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package com.jj.upgrade; |
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|
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import com.jj.Service.UpdateService; |
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|
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import android.app.AlertDialog; |
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import android.app.Application; |
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import android.content.DialogInterface; |
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import android.content.Intent; |
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import android.content.pm.PackageInfo; |
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import android.content.pm.PackageManager.NameNotFoundException; |
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|
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/*** |
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* MyApplication |
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* |
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* @author zhangjia |
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* |
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*/ |
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public class MyApplication extends Application { |
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|
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public static int localVersion = 0 ; // 本地安装版本 |
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|
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public static int serverVersion = 2 ; // 服务器版本 |
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|
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public static String downloadDir = "jj/" ; // 安装目录 |
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|
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@Override |
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public void onCreate() { |
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super .onCreate(); |
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try { |
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PackageInfo packageInfo = getApplicationContext() |
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.getPackageManager().getPackageInfo(getPackageName(), 0 ); |
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localVersion = packageInfo.versionCode; |
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} catch (NameNotFoundException e) { |
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e.printStackTrace(); |
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} |
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|
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/*** |
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* 在这里写一个方法用于请求获取服务器端的serverVersion. |
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*/ |
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|
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} |
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|
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} |
我们一般把全局的东西放到application里面.
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public class MainActivity extends Activity { |
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private MyApplication myApplication; |
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|
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@Override |
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public void onCreate(Bundle savedInstanceState) { |
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super .onCreate(savedInstanceState); |
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setContentView(R.layout.main); |
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|
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checkVersion(); |
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} |
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|
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/*** |
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* 检查是否更新版本 |
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*/ |
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public void checkVersion() { |
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myApplication = (MyApplication) getApplication(); |
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if (myApplication.localVersion < myApplication.serverVersion) { |
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|
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// 发现新版本,提示用户更新 |
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AlertDialog.Builder alert = new AlertDialog.Builder( this ); |
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alert.setTitle( "软件升级" ) |
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.setMessage( "发现新版本,建议立即更新使用." ) |
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.setPositiveButton( "更新" , |
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new DialogInterface.OnClickListener() { |
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public void onClick(DialogInterface dialog, |
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int which) { |
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Intent updateIntent = new Intent( |
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MainActivity. this , |
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UpdateService. class ); |
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updateIntent.putExtra( |
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"app_name" , |
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getResources().getString( |
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R.string.app_name)); |
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startService(updateIntent); |
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} |
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}) |
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.setNegativeButton( "取消" , |
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new DialogInterface.OnClickListener() { |
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public void onClick(DialogInterface dialog, |
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int which) { |
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dialog.dismiss(); |
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} |
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}); |
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alert.create().show(); |
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|
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} |
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} |
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} |
我们在运行应用的时候要checkVersion();进行检查版本是否要进行升级. 最主要的是UpdateService服务类
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@Override |
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public int onStartCommand(Intent intent, int flags, int startId) { |
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|
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app_name = intent.getStringExtra( "app_name" ); |
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// 创建文件 |
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FileUtil.createFile(app_name); // 创建文件 |
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|
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createNotification(); // 首次创建 |
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|
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createThread(); // 线程下载 |
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|
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return super .onStartCommand(intent, flags, startId); |
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|
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} |
创建路径及文件,这里就不介绍了,不明白了下载源码看。
首先我们先 看createNotification().这个方法:
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/*** |
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* 创建通知栏 |
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*/ |
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RemoteViews contentView; |
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public void createNotification() { |
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notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); |
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notification = new Notification(); |
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notification.icon = R.drawable.ic_launcher; // 这个图标必须要设置,不然下面那个RemoteViews不起作用. |
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// 这个参数是通知提示闪出来的值. |
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notification.tickerText = "开始下载" ; |
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// |
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// updateIntent = new Intent(this, MainActivity.class); |
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// pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0); |
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// |
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// // 这里面的参数是通知栏view显示的内容 |
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// notification.setLatestEventInfo(this, app_name, "下载:0%", |
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// pendingIntent); |
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// |
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// notificationManager.notify(notification_id, notification); |
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|
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/*** |
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* 在这里我们用自定的view来显示Notification |
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*/ |
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contentView = new RemoteViews(getPackageName(), |
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R.layout.notification_item); |
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contentView.setTextViewText(R.id.notificationTitle, "正在下载" ); |
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contentView.setTextViewText(R.id.notificationPercent, "0%" ); |
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contentView.setProgressBar(R.id.notificationProgress, 100 , 0 , false ); |
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|
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notification.contentView = contentView; |
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|
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updateIntent = new Intent( this , MainActivity. class ); |
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updateIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); |
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pendingIntent = PendingIntent.getActivity( this , 0 , updateIntent, 0 ); |
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|
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notification.contentIntent = pendingIntent; |
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|
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notificationManager.notify(notification_id, notification); |
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|
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} |
上面实现的也不难理解.(主要是初始化Notification,用于提醒用户开始下载)接着我们要看createThread方法
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/*** |
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* 开线程下载 |
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*/ |
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public void createThread() { |
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/*** |
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* 更新UI |
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*/ |
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final Handler handler = new Handler() { |
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@Override |
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public void handleMessage(Message msg) { |
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switch (msg.what) { |
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case DOWN_OK: |
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// 下载完成,点击安装 |
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Uri uri = Uri.fromFile(FileUtil.updateFile); |
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Intent intent = new Intent(Intent.ACTION_VIEW); |
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intent.setDataAndType(uri, |
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"application/vnd.android.package-archive" ); |
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|
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pendingIntent = PendingIntent.getActivity( |
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UpdateService. this , 0 , intent, 0 ); |
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|
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notification.setLatestEventInfo(UpdateService. this , |
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app_name, "下载成功,点击安装" , pendingIntent); |
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|
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notificationManager.notify(notification_id, notification); |
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|
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stopSelf(); |
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break ; |
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case DOWN_ERROR: |
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notification.setLatestEventInfo(UpdateService. this , |
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app_name, "下载失败" , pendingIntent); |
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break ; |
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|
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default : |
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stopSelf(); |
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break ; |
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} |
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|
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} |
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|
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}; |
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|
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final Message message = new Message(); |
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|
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new Thread( new Runnable() { |
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@Override |
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public void run() { |
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|
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try { |
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long downloadSize = downloadUpdateFile(down_url, |
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FileUtil.updateFile.toString()); |
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if (downloadSize > 0 ) { |
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// 下载成功 |
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message.what = DOWN_OK; |
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handler.sendMessage(message); |
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} |
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|
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} catch (Exception e) { |
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e.printStackTrace(); |
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message.what = DOWN_ERROR; |
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handler.sendMessage(message); |
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} |
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|
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} |
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}).start(); |
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} |
这个方法有点小多,不过我想大家都看的明白,我在这里简单说名一下:首先我们创建一个handler用于检测最后下载ok还是not ok. 下面我们开启了线程进行下载数据。 我们接着看downloadUpdateFile这个方法:
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/*** |
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* 下载文件 |
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* |
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* @return |
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* @throws MalformedURLException |
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*/ |
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public long downloadUpdateFile(String down_url, String file) |
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throws Exception { |
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int down_step = 5 ; // 提示step |
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int totalSize; // 文件总大小 |
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int downloadCount = 0 ; // 已经下载好的大小 |
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int updateCount = 0 ; // 已经上传的文件大小 |
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InputStream inputStream; |
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OutputStream outputStream; |
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|
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URL url = new URL(down_url); |
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HttpURLConnection httpURLConnection = (HttpURLConnection) url |
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.openConnection(); |
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httpURLConnection.setConnectTimeout(TIMEOUT); |
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httpURLConnection.setReadTimeout(TIMEOUT); |
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// 获取下载文件的size |
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totalSize = httpURLConnection.getContentLength(); |
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if (httpURLConnection.getResponseCode() == 404 ) { |
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throw new Exception( "fail!" ); |
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} |
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inputStream = httpURLConnection.getInputStream(); |
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outputStream = new FileOutputStream(file, false ); // 文件存在则覆盖掉 |
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byte buffer[] = new byte [ 1024 ]; |
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int readsize = 0 ; |
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while ((readsize = inputStream.read(buffer)) != - 1 ) { |
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outputStream.write(buffer, 0 , readsize); |
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downloadCount += readsize; // 时时获取下载到的大小 |
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/** |
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* 每次增张5% |
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*/ |
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if (updateCount == 0 |
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|| (downloadCount * 100 / totalSize - down_step) >= updateCount) { |
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updateCount += down_step; |
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// 改变通知栏 |
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// notification.setLatestEventInfo(this, "正在下载...", updateCount |
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// + "%" + "", pendingIntent); |
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contentView.setTextViewText(R.id.notificationPercent, |
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updateCount + "%" ); |
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contentView.setProgressBar(R.id.notificationProgress, 100 , |
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updateCount, false ); |
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// show_view |
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notificationManager.notify(notification_id, notification); |
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|
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} |
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|
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} |
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if (httpURLConnection != null ) { |
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httpURLConnection.disconnect(); |
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} |
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inputStream.close(); |
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outputStream.close(); |
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|
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return downloadCount; |
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|
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} |
注释已经写的很详细,相信大家都看的明白,如果哪里有不足的地方,请留您吉言指出。
这里我用别的app代替了,简单省事,正常的话,你要对你的APP进行数字签名。然后才可以进行升级应用。
示意图: