轉載註明：Android開發中文站 » Android版本檢測升級
我們應該都有類似的使用體驗，當一款APP需要更新是，進入界面會提醒有新的更新是否更新，這裏有那麼幾個步驟
1、首先檢測當前版本
2、判斷服務器中版本
3、如果有更新則點擊更新，下載安裝包，下載完成後自動安裝
具體代碼怎麼實現呢？下面我們一起看一下
/* *
獲取當前程序的版本號 */private
String getVersionName() throws
Exception{ //獲取packagemanager的實例 PackageManager
packageManager = getPackageManager(); //getPackageName()是你當前類的包名，0代表是獲取版本信息 PackageInfo
packInfo = packageManager.getPackageInfo(getPackageName(), 0); return
packInfo.versionName;}
讀取服務器版本號
/* *
用pull解析器解析服務器返回的xml文件 (xml封裝了版本號) */public
static
UpdataInfo getUpdataInfo(InputStream is) throws
Exception{ XmlPullParser
parser = Xml.newPullParser(); parser.setInput(is, "utf-8");//設置解析的數據源 int
type = parser.getEventType(); UpdataInfo
info = new
UpdataInfo();//實體 while(type
!= XmlPullParser.END_DOCUMENT ){ switch
(type) { case
XmlPullParser.START_TAG: if("version".equals(parser.getName())){ info.setVersion(parser.nextText()); //獲取版本號 }else
if
("url".equals(parser.getName())){ info.setUrl(parser.nextText()); //獲取要升級的APK文件 }else
if
("description".equals(parser.getName())){ info.setDescription(parser.nextText()); //獲取該文件的信息 } break; } type
= parser.next(); } return
info;}
public
static
File getFileFromServer(String path, ProgressDialog pd) throws
Exception{ //如果相等的話表示當前的sdcard掛載在手機上並且是可用的 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ URL
url = new
URL(path); HttpURLConnection
conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); //獲取到文件的大小 pd.setMax(conn.getContentLength()); InputStream
is = conn.getInputStream(); File
file = new
File(Environment.getExternalStorageDirectory(), "updata.apk"); FileOutputStream
fos = new
FileOutputStream(file); BufferedInputStream
bis = new
BufferedInputStream(is); byte[]
buffer = new
byte[1024]; int
len ; int
total=0; while((len
=bis.read(buffer))!=-1){ fos.write(buffer, 0,
len); total+=
len; //獲取當前下載量 pd.setProgress(total); } fos.close(); bis.close(); is.close(); return
file; } else{ return
null; }}
/* *
從服務器獲取xml解析並進行比對版本號 */public
class
CheckVersionTask implements
Runnable{ public
void
run() { try
{ //從資源文件獲取服務器
地址 String
path = getResources().getString(R.string.serverurl); //包裝成url的對象 URL
url = new
URL(path); HttpURLConnection
conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); InputStream
is =conn.getInputStream(); info
= UpdataInfoParser.getUpdataInfo(is); if(info.getVersion().equals(versionname)){ Log.i(TAG,"版本號相同無需升級"); LoginMain(); }else{ Log.i(TAG,"版本號不同
,提示用戶升級 "); Message
msg = new
Message(); msg.what
= UPDATA_CLIENT; handler.sendMessage(msg); } } catch
(Exception e) { //
待處理 Message
msg = new
Message(); msg.what
= GET_UNDATAINFO_ERROR; handler.sendMessage(msg); e.printStackTrace(); } }}Handler
handler = new
Handler(){ @Override public
void
handleMessage(Message msg) { //
TODO Auto-generated method stub super.handleMessage(msg); switch
(msg.what) { case
UPDATA_CLIENT: //對話框通知用戶升級程序 showUpdataDialog(); break; case
GET_UNDATAINFO_ERROR: //服務器超時 Toast.makeText(getApplicationContext(), "獲取服務器更新信息失敗", 1).show(); LoginMain(); break; case
DOWN_ERROR: //下載apk失敗 Toast.makeText(getApplicationContext(), "下載新版本失敗", 1).show(); LoginMain(); break; } }};/* * *
彈出對話框通知用戶更新程序 * *
彈出對話框的步驟： *
1.創建alertDialog的builder. *
2.要給builder設置屬性, 對話框的內容,樣式,按鈕 *
3.通過builder 創建一個對話框 *
4.對話框show()出來 */protected
void
showUpdataDialog() { AlertDialog.Builder
builer = new
Builder(this)
; builer.setTitle("版本升級"); builer.setMessage(info.getDescription()); //當點確定按鈕時從服務器上下載
新的apk 然後安裝 builer.setPositiveButton("確定", new
OnClickListener() { public
void
onClick(DialogInterface dialog, int
which) { Log.i(TAG,"下載apk,更新"); downLoadApk(); } }); //當點取消按鈕時進行登錄 builer.setNegativeButton("取消", new
OnClickListener() { public
void
onClick(DialogInterface dialog, int
which) { //
TODO Auto-generated method stub LoginMain(); } }); AlertDialog
dialog = builer.create(); dialog.show();}/* *
從服務器中下載APK */protected
void
downLoadApk() { final
ProgressDialog pd; //進度條對話框 pd
= new
ProgressDialog(this); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pd.setMessage("正在下載更新"); pd.show(); new
Thread(){ @Override public
void
run() { try
{ File
file = DownLoadManager.getFileFromServer(info.getUrl(), pd); sleep(3000); installApk(file); pd.dismiss(); //結束掉進度條對話框 } catch
(Exception e) { Message
msg = new
Message(); msg.what
= DOWN_ERROR; handler.sendMessage(msg); e.printStackTrace(); } }}.start();}//安裝apkprotected
void
installApk(File file) { Intent
intent = new
Intent(); //執行動作 intent.setAction(Intent.ACTION_VIEW); //執行的數據類型 intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); startActivity(intent);}/* *
進入程序的主界面 */private
void
LoginMain(){ Intent
intent = new
Intent(this,MainActivity.class); startActivity(intent); //結束掉當前的activity this.finish();}
public
class
UpdataInfo { private
String version; private
String url; private
String description; public
String getVersion() { return
version; } public
void
setVersion(String version) { this.version
= version; } public
String getUrl() { return
url; } public
void
setUrl(String url) { this.url
= url; } public
String getDescription() { return
description; } public
void
setDescription(String description) { this.description
= description; }}
<?xml
version="1.0"
encoding="utf-8"?><info> <version>2.0</version> <description>檢測到最新版本，請及時更新！</description></info>
