81大家好,發(fā)現(xiàn)半年沒有更新博客了,最近一直都比較忙,決定在凌晨 英超 阿森納VS富勒姆 中場休息的時候,給大家分享Android里應(yīng)用版本更新功能這一塊的實現(xiàn)。
一個好的應(yīng)用軟件都是需要好的維護,從初出版本到最后精品,這個過程需要版本不停的更新,那么如何讓用戶第一時間獲取最新的應(yīng)用安裝包呢?那么就要求我們從第一個版本就要實現(xiàn)升級模塊這一功能。
自動更新功能的實現(xiàn)原理,就是我們事先和后臺協(xié)商好一個接口,我們在應(yīng)用的主Activity里,去訪問這個接口,如果需要更新,后臺會返回一些數(shù)據(jù)(比如,提示語;最新版本的url等)。然后我們給出提示框,用戶點擊開始下載,下載完成開始覆蓋安裝程序,這樣用戶的應(yīng)用就保持最新的拉。
為了讓大家容易理解,我像往常一樣準備一個小例子,這里為了方便我就省去了和后臺交互部分了。步驟分別如下:
第一步:新建一個Android工程命名為:UpdateDemo.代碼結(jié)構(gòu)如下圖所示:
第二步:新建一個UpdateManager.java類,負責(zé)軟件更新功能模塊,代碼如下:
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package com.tutor.update; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import android.app.AlertDialog; import android.app.Dialog; import android.app.AlertDialog.Builder; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.net.Uri; import android.os.Handler; import android.os.Message; import android.view.LayoutInflater; import android.view.View; import android.widget.ProgressBar; public class UpdateManager { private Context mContext; //提示語 private String updateMsg = "有最新的軟件包哦,親快下載吧~"; //返回的安裝包url private String apkUrl = "http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk"; private Dialog noticeDialog; private Dialog downloadDialog; /* 下載包安裝路徑 */ private static final String savePath = "/sdcard/updatedemo/"; private static final String saveFileName = savePath + "UpdateDemoRelease.apk"; /* 進度條與通知ui刷新的handler和msg常量 */ private ProgressBar mProgress; private static final int DOWN_UPDATE = 1; private static final int DOWN_OVER = 2; private int progress; private Thread downLoadThread; private boolean interceptFlag = false; private Handler mHandler = new Handler(){ public void handleMessage(Message msg) { switch (msg.what) { case DOWN_UPDATE: mProgress.setProgress(progress); break; case DOWN_OVER: installApk(); break; default: break; } }; }; public UpdateManager(Context context) { this.mContext = context; } //外部接口讓主Activity調(diào)用 public void checkUpdateInfo(){ showNoticeDialog(); } private void showNoticeDialog(){ AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("軟件版本更新"); builder.setMessage(updateMsg); builder.setPositiveButton("下載", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); showDownloadDialog(); } }); builder.setNegativeButton("以后再說", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); noticeDialog = builder.create(); noticeDialog.show(); } private void showDownloadDialog(){ AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("軟件版本更新"); final LayoutInflater inflater = LayoutInflater.from(mContext); View v = inflater.inflate(R.layout.progress, null); mProgress = (ProgressBar)v.findViewById(R.id.progress); builder.setView(v); builder.setNegativeButton("取消", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); interceptFlag = true; } }); downloadDialog = builder.create(); downloadDialog.show(); downloadApk(); } private Runnable mdownApkRunnable = new Runnable() { @Override public void run() { try { URL url = new URL(apkUrl); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.connect(); int length = conn.getContentLength(); InputStream is = conn.getInputStream(); File file = new File(savePath); if(!file.exists()){ file.mkdir(); } String apkFile = saveFileName; File ApkFile = new File(apkFile); FileOutputStream fos = new FileOutputStream(ApkFile); int count = 0; byte buf[] = new byte[1024]; do{ int numread = is.read(buf); count += numread; progress =(int)(((float)count / length) * 100); //更新進度 mHandler.sendEmptyMessage(DOWN_UPDATE); if(numread <= 0){ //下載完成通知安裝 mHandler.sendEmptyMessage(DOWN_OVER); break; } fos.write(buf,0,numread); }while(!interceptFlag);//點擊取消就停止下載. fos.close(); is.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); } } }; /** * 下載apk * @param url */ private void downloadApk(){ downLoadThread = new Thread(mdownApkRunnable); downLoadThread.start(); } /** * 安裝apk * @param url */ private void installApk(){ File apkfile = new File(saveFileName); if (!apkfile.exists()) { return; } Intent i = new Intent(Intent.ACTION_VIEW); i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive"); mContext.startActivity(i); } }
第三步:在MainActivity.java也就是主Activity調(diào)用,代碼如下:
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package com.tutor.update; import android.app.Activity; import android.os.Bundle; public class MainAcitivity extends Activity { private UpdateManager mUpdateManager; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //這里來檢測版本是否需要更新 mUpdateManager = new UpdateManager(this); mUpdateManager.checkUpdateInfo(); } }
第四步:添加程序所用的資源與權(quán)限:下載的時候用到了ProgressBar,所以事先寫了一個progress.xml布局文件,代碼如下:
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ProgressBar android:id="@+id/progress" android:layout_width="fill_parent" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal" /> </LinearLayout>
下載的時候用到了網(wǎng)絡(luò)部分,所以要在AndroidManifest.xml中添加網(wǎng)絡(luò)權(quán)限,代碼如下: view plaincopy
<uses-permission android:name="android.permission.INTERNET" />
原帖:http://blog.csdn.net/android_tutor/article/details/7015986
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