Android应用自动更新功能的实现！！！软件更新，自动下载，安装

第一步：新建一个Android工程命名为:UpdateDemo.代码结构如下图所示：

第二步：新建一个UpdateManager.java类，负责软件更新功能模块，代码如下：

[java] view plain copy

packagecom.tutor.update;
importjava.io.File;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.net.HttpURLConnection;
importjava.net.MalformedURLException;
importjava.net.URL;
importandroid.app.AlertDialog;
importandroid.app.Dialog;
importandroid.app.AlertDialog.Builder;
importandroid.content.Context;
importandroid.content.DialogInterface;
importandroid.content.Intent;
importandroid.content.DialogInterface.OnClickListener;
importandroid.net.Uri;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.widget.ProgressBar;
publicclassUpdateManager{
privateContextmContext;
//提示语
privateStringupdateMsg="有最新的软件包哦，亲快下载吧~";
//返回的安装包url
privateStringapkUrl="http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk";
privateDialognoticeDialog;
privateDialogdownloadDialog;
/*下载包安装路径*/
privatestaticfinalStringsavePath="/sdcard/updatedemo/";
privatestaticfinalStringsaveFileName=savePath+"UpdateDemoRelease.apk";
/*进度条与通知ui刷新的handler和msg常量*/
privateProgressBarmProgress;
privatestaticfinalintDOWN_UPDATE=1;
privatestaticfinalintDOWN_OVER=2;
privateintprogress;
privateThreaddownLoadThread;
privatebooleaninterceptFlag=false;
privateHandlermHandler=newHandler(){
publicvoidhandleMessage(Messagemsg){
switch(msg.what){
caseDOWN_UPDATE:
mProgress.setProgress(progress);
break;
caseDOWN_OVER:
installApk();
break;
default:
break;
}
};
};
publicUpdateManager(Contextcontext){
this.mContext=context;
}
//外部接口让主Activity调用
publicvoidcheckUpdateInfo(){
showNoticeDialog();
}
privatevoidshowNoticeDialog(){
AlertDialog.Builderbuilder=newBuilder(mContext);
builder.setTitle("软件版本更新");
builder.setMessage(updateMsg);
builder.setPositiveButton("下载",newOnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
dialog.dismiss();
showDownloadDialog();
}
});
builder.setNegativeButton("以后再说",newOnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
dialog.dismiss();
}
});
noticeDialog=builder.create();
noticeDialog.show();
}
privatevoidshowDownloadDialog(){
AlertDialog.Builderbuilder=newBuilder(mContext);
builder.setTitle("软件版本更新");
finalLayoutInflaterinflater=LayoutInflater.from(mContext);
Viewv=inflater.inflate(R.layout.progress,null);
mProgress=(ProgressBar)v.findViewById(R.id.progress);
builder.setView(v);
builder.setNegativeButton("取消",newOnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
dialog.dismiss();
interceptFlag=true;
}
});
downloadDialog=builder.create();
downloadDialog.show();
downloadApk();
}
privateRunnablemdownApkRunnable=newRunnable(){
@Override
publicvoidrun(){
try{
URLurl=newURL(apkUrl);
HttpURLConnectionconn=(HttpURLConnection)url.openConnection();
conn.connect();
intlength=conn.getContentLength();
InputStreamis=conn.getInputStream();
Filefile=newFile(savePath);
if(!file.exists()){
file.mkdir();
}
StringapkFile=saveFileName;
FileApkFile=newFile(apkFile);
if(!ApkFile.exists()){
ApkFile.createNewFile();
}
FileOutputStreamfos=newFileOutputStream(ApkFile);
intcount=0;
bytebuf[]=newbyte[1024];
do{
intnumread=is.read(buf);
count+=numread;
progress=(int)(((float)count/length)*100);
//更新进度
mHandler.sendEmptyMessage(DOWN_UPDATE);
if(numread<=0){
//下载完成通知安装
mHandler.sendEmptyMessage(DOWN_OVER);
break;
}
fos.write(buf,0,numread);
}while(!interceptFlag);//点击取消就停止下载.
fos.close();
is.close();
}catch(MalformedURLExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
};
/**
*下载apk
*@paramurl
*/
privatevoiddownloadApk(){
downLoadThread=newThread(mdownApkRunnable);
downLoadThread.start();
}
/**
*安装apk
*@paramurl
*/
privatevoidinstallApk(){
Fileapkfile=newFile(saveFileName);
if(!apkfile.exists()){
return;
}
Intenti=newIntent(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调用,代码如下: [java] view plain copy

packagecom.tutor.update;
importandroid.app.Activity;
importandroid.os.Bundle;
publicclassMainAcitivityextendsActivity{
privateUpdateManagermUpdateManager;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//这里来检测版本是否需要更新
mUpdateManager=newUpdateManager(this);
mUpdateManager.checkUpdateInfo();
}
}

第四步：添加程序所用的资源与权限：

下载的时候用到了ProgressBar,所以事先写了一个progress.xml布局文件，代码如下:

[java] view plain copy

<?xmlversion="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>

下载的时候用到了网络部分，所以要在AndroidManifest.xml中添加网络权限，代码如下: [java] view plain copy

<uses-permissionandroid:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
</uses-permission>

第五步:运行查看效果如下:

图一:提示有最新包图二：点击开始下载

图三：下载完开始安装，我这里模拟器空间不足了。

源代码点击进入==>

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