一个好的应用软件都是需要好的维护,从初出版本到最后精品,这个过程需要版本不停的更新,那么如何让用户第一时间获取最新的应用安装包呢?那么就要求我们从第一个版本就要实现升级模块这一功能。
自动更新功能的实现原理,就是我们事先和后台协商好一个接口,我们在应用的主Activity里,去访问这个接口,如果需要更新,后台会返回一些数据(比如,提示语;最新版本的url等)。然后我们给出提示框,用户点击开始下载,下载完成开始覆盖安装程序,这样用户的应用就保持最新的拉。
这里为了方便我就省去了和后台交互部分了。步骤分别如下:
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:
packagecom.tutor.update;
importjava.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 classUpdateManager {
private Context mContext;
//提示语
private String updateMsg ="有最新的软件包哦,亲快下载吧~";
//返回的安装包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;
privatestatic final String savePath = "/sdcard/updatedemo/";
privatestatic final String saveFileName = savePath +"UpdateDemoRelease.apk";
privateProgressBar mProgress;
privatestatic final int DOWN_UPDATE = 1;
privatestatic final int DOWN_OVER = 2;
private intprogress;
privateThread downLoadThread;
privateboolean interceptFlag = false;
privateHandler mHandler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
caseDOWN_UPDATE:
mProgress.setProgress(progress);
break;
caseDOWN_OVER:
installApk();
break;
default:
break;
}
};
};
public UpdateManager(Context context) {
this.mContext = context;
}
//外部接口让主Activity调用
public void checkUpdateInfo(){
showNoticeDialog();
}
private void showNoticeDialog(){
AlertDialog.Builder builder =new Builder(mContext);
builder.setTitle("软件版本更新");
builder.setMessage(updateMsg);
builder.setPositiveButton("下载",new OnClickListener(){
@Override
public voidonClick(DialogInterface dialog, int which) {
dialog.dismiss();
showDownloadDialog();
}
});
builder.setNegativeButton("以后再说",new OnClickListener(){
@Override
public voidonClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
noticeDialog =builder.create();
noticeDialog.show();
}
private void showDownloadDialog(){
AlertDialog.Builder builder =new Builder(mContext);
builder.setTitle("软件版本更新");
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 voidonClick(DialogInterface dialog, int which) {
dialog.dismiss();
interceptFlag= true;
}
});
downloadDialog =builder.create();
downloadDialog.show();
downloadApk();
}
private Runnable mdownApkRunnable = newRunnable() {
@Override
public void run() {
try {
URLurl = new URL(apkUrl);
HttpURLConnectionconn = (HttpURLConnection)url.openConnection();
conn.connect();
intlength = conn.getContentLength();
InputStreamis = conn.getInputStream();