Android实现检查并下载APK更新、安装APK及获取网络信息的方法

本文所述实例为一个天气预报中的android代码，主要包括了下载和安装apk、检查apk更新、显示'已经是最新'或者'无法获取版本信息'对话框、获取当前客户端版本信息、显示版本更新通知对话框、显示下载对话框、判断是否挂载了sd卡、显示文件大小格式：2个小数点显示等。具体实现代码如下：

import java.io.bytearrayinputstream;
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 java.text.decimalformat;
import org.apache.http.httpentity;
import org.apache.http.httpresponse;
import org.apache.http.client.methods.httpget;
import org.apache.http.conn.connecttimeoutexception;
import org.apache.http.impl.client.defaulthttpclient;
import org.apache.http.params.coreconnectionpnames;
import org.apache.http.util.entityutils;
import org.lmw.weather.r;
import org.lmw.weather.entity.appdetail;
import android.app.alertdialog;
import android.app.dialog;
import android.app.progressdialog;
import android.app.alertdialog.builder;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.content.dialoginterface.oncancellistener;
import android.content.dialoginterface.onclicklistener;
import android.content.pm.packageinfo;
import android.content.pm.packagemanager.namenotfoundexception;
import android.net.uri;
import android.os.environment;
import android.os.handler;
import android.os.message;
import android.view.layoutinflater;
import android.view.view;
import android.widget.progressbar;
import android.widget.textview;
import android.widget.toast;
public class downloadmanager {
  private static final int down_nosdcard = 0;
  private static final int down_update = 1;
  private static final int down_over = 2;
  private static final int down_error=3;
  private static final int dialog_type_latest = 0;
  private static final int dialog_type_fail = 1;
  private static final int dialog_type_interneterror = 2;
  private static downloadmanager downloadmanager;
  private context mcontext;
  // 通知对话框
  private dialog noticedialog;
  // 下载对话框
  private dialog downloaddialog;
  // 进度条
  private progressbar mprogress;
  // 显示下载数值
  private textview mprogresstext;
  // 查询动画
  private progressdialog mprodialog;
  // '已经是最新' 或者 '无法获取最新版本' 的对话框
  private dialog latestorfaildialog;
  // 返回的安装包url
  private string apkurl = "";
  // 进度值
  private int progress;
  // 下载线程
  private thread downloadthread;
  // 终止标记
  private boolean interceptflag;
  // 提示语
  private string updatemsg = "";
  // 下载包保存路径
  private string savepath = "";
  // apk保存完整路径
  private string apkfilepath = "";
  // 临时下载文件路径
  private string tmpfilepath = "";
  // 下载文件大小
  private string apkfilesize;
  // 已下载文件大小
  private string tmpfilesize;
  private string curversionname = "";
  private int curversioncode;
  private appdetail mdownload;
  private string checkurl="http://192.168.0.133:8080/lmw/androidmarket/simpleweather-20130701093349937/update.xml";
  private handler mhandler = new handler() {
 public void handlemessage(message msg) {
   switch (msg.what) {
   case down_update:
 mprogress.setprogress(progress);
 mprogresstext.settext(tmpfilesize + "/" + apkfilesize);
 break;
   case down_over:
 downloaddialog.dismiss();
 installapk();
 break;
   case down_nosdcard:
 downloaddialog.dismiss();
 toast.maketext(mcontext, "无法下载安装文件，请检查sd卡是否挂载",toast.length_short).show();
 break;
   case down_error:
 downloaddialog.dismiss();
 if(msg.arg1==0){
 toast.maketext(mcontext, "网络不给力啊", toast.length_short).show();
 }else if(msg.arg1==1||msg.arg1==2){
 toast.maketext(mcontext, "未找到资源",toast.length_short).show();
 }
 break;
   }
 };
  };
  public static downloadmanager getdownloadmanager() {
 if (downloadmanager == null) {
   downloadmanager = new downloadmanager();
 }
 downloadmanager.interceptflag = false;
 return downloadmanager;
  }
  public void downloader(context context, appdetail download) {
 this.mcontext = context;
 this.mdownload = download;
 showdownloaddialog();
  }
  /**
   * 检查app更新
   * @param context
   * @param isshowmsg
   * 是否显示提示消息
   */
  public void checkappupdate(context context, final boolean isshowmsg,final boolean notmain) {
 this.mcontext = context;
 getcurrentversion(mcontext);
 if (isshowmsg) {
   if (mprodialog == null)
 mprodialog = progressdialog.show(mcontext, null, "正在检测，请稍后...",true, true);
   else if (mprodialog.isshowing()|| (latestorfaildialog != null && latestorfaildialog.isshowing()))
 return;
 }
 final handler handler = new handler() {
   public void handlemessage(message msg) {
 // 进度条对话框不显示 - 检测结果也不显示
 if (mprodialog != null && !mprodialog.isshowing()) {
   return;
 }
 // 关闭并释放释放进度条对话框
 if (isshowmsg && mprodialog != null) {
   mprodialog.dismiss();
   mprodialog = null;
 }
 // 显示检测结果
 if (msg.what == 1) {
   mdownload = (appdetail) msg.obj;
   if (mdownload != null) {
  if (curversioncode < mdownload.getversioncode()) {
    apkurl = mdownload.geturi()+mdownload.getfilename();
    updatemsg = mdownload.getapphistory();
    shownoticedialog();
  } else if (isshowmsg) {
    if (notmain) {
  showlatestorfaildialog(dialog_type_latest);
    }
  }
   }
 }else if(msg.what==-1&&isshowmsg){
  showlatestorfaildialog(dialog_type_interneterror);
 }else if (isshowmsg) {
   showlatestorfaildialog(dialog_type_fail);
 }
   }
 };
 new thread() {
   public void run() {
 message msg = new message();
 try {
  defaulthttpclient client = new defaulthttpclient();
  client.getparams().setparameter(coreconnectionpnames.connection_timeout, 3000);
  httpget get = new httpget(checkurl);
  httpresponse response = client.execute(get);
  if (response.getstatusline().getstatuscode() == 200) {
  httpentity entity = response.getentity();
  inputstream stream = new bytearrayinputstream( entityutils.tostring(entity, "gb2312").getbytes());
   appdetail update = appdetail.parsexml(stream);
   msg.what = 1;
   msg.obj = update;
  }else{
   msg.what = -1;
  }
 } catch (exception e) {
   e.printstacktrace();
   msg.what = -1;
 }
 handler.sendmessage(msg);
   }
 }.start();
  }
  /*显示'已经是最新'或者'无法获取版本信息'对话框*/
  private void showlatestorfaildialog(int dialogtype) {
   string toastmsg="";
 if (latestorfaildialog != null) {
   // 关闭并释放之前的对话框
   latestorfaildialog.dismiss();
   latestorfaildialog = null;
 }
// alertdialog.builder builder = new builder(mcontext);
// builder.settitle("系统提示");
 if (dialogtype == dialog_type_latest) {
//   builder.setmessage("您当前已经是最新版本");
   toastmsg="您当前已经是最新版本";
 } else if (dialogtype == dialog_type_fail) {
//   builder.setmessage("无法获取版本更新信息");
 toastmsg="无法获取版本更新信息";
 }else if(dialogtype==dialog_type_interneterror){
// builder.setmessage("网络故障，无法连接服务器");
 toastmsg="网络故障，无法连接服务器";
 }
 toast.maketext(mcontext, toastmsg, toast.length_short).show();
  }
  /*获取当前客户端版本信息*/
  public string getcurrentversion(context context) {
 try {
   packageinfo info = context.getpackagemanager().getpackageinfo(context.getpackagename(), 0);
   curversionname = info.versionname;
   curversioncode = info.versioncode;
 } catch (namenotfoundexception e) {
   e.printstacktrace(system.err);
 }
 return curversionname;
  }
  /*显示版本更新通知对话框*/
  private void shownoticedialog() {
 alertdialog.builder builder = new builder(mcontext);
 builder.settitle("软件版本更新");
 builder.setmessage(updatemsg);
 builder.setpositivebutton("立即更新", new onclicklistener() {
   @override
   public void onclick(dialoginterface dialog, int which) {
 dialog.dismiss();
 showdownloaddialog();
   }
 });
 builder.setnegativebutton("以后再说", new onclicklistener() {
   @override
   public void onclick(dialoginterface dialog, int which) {
 dialog.dismiss();
   }
 });
 noticedialog = builder.create();
 noticedialog.show();
  }
  /*显示下载对话框*/
  private void showdownloaddialog() {
 alertdialog.builder builder = new builder(mcontext);
 builder.settitle("正在下载安装包");
 final layoutinflater inflater = layoutinflater.from(mcontext);
 view v = inflater.inflate(r.layout.download_progress, null);
 mprogress = (progressbar) v.findviewbyid(r.id.update_progress);
 mprogresstext = (textview) v.findviewbyid(r.id.update_progress_text);
 builder.setview(v);
 builder.setnegativebutton("取消", new onclicklistener() {
   @override
   public void onclick(dialoginterface dialog, int which) {
 dialog.dismiss();
 interceptflag = true;
   }
 });
 builder.setoncancellistener(new oncancellistener() {
   @override
   public void oncancel(dialoginterface dialog) {
 dialog.dismiss();
 interceptflag = true;
   }
 });
 downloaddialog = builder.create();
 downloaddialog.setcanceledontouchoutside(false);
 downloaddialog.show();
 downloadapk();
  }
  private runnable mdownapkrunnable = new runnable() {
 message error_msg=new message();
 @override
 public void run(){
   try {
 string apkname = mdownload.getfilename().replace(".apk","")+".apk";
 string tmpapk = mdownload.getfilename().replace(".apk","")+".tmp";
 // 判断是否挂载了sd卡
 string storagestate = environment.getexternalstoragestate();
 if (storagestate.equals(environment.media_mounted)) {
   savepath = environment.getexternalstoragedirectory().getabsolutepath() + "/qn/qnstore/";
   file file = new file(savepath);
   if (!file.exists()) {
  file.mkdirs();
   }
   apkfilepath = savepath + apkname;
   tmpfilepath = savepath + tmpapk;
 }
 // 没有挂载sd卡，无法下载文件
 if (apkfilepath == null || apkfilepath == "") {
   mhandler.sendemptymessage(down_nosdcard);
   return;
 }
 file apkfile = new file(apkfilepath);
 // 是否已下载更新文件
// if (apkfile.exists()) {
//   downloaddialog.dismiss();
//   installapk();
//   return;
// }
 // 输出临时下载文件
 file tmpfile = new file(tmpfilepath);
 fileoutputstream fos = new fileoutputstream(tmpfile);
 url url = new url(mdownload.geturi()+mdownload.getfilename());
 httpurlconnection conn = (httpurlconnection) url.openconnection();
 try {
   conn.connect();
 } catch (connecttimeoutexception e) {
   error_msg.what=down_error;
   error_msg.arg1=0;
   mhandler.sendmessage(error_msg);
 }
 int length = conn.getcontentlength();
 inputstream is = conn.getinputstream();
 // 显示文件大小格式：2个小数点显示
 decimalformat df = new decimalformat("0.00");
 // 进度条下面显示的总文件大小
 apkfilesize = df.format((float) length / 1024 / 1024) + "mb";
 int count = 0;
 byte buf[] = new byte[1024];
 do {
   int numread = is.read(buf);
   count += numread;
   // 进度条下面显示的当前下载文件大小
   tmpfilesize = df.format((float) count / 1024 / 1024) + "mb";
   // 当前进度值
   progress = (int) (((float) count / length) * 100);
   // 更新进度
   mhandler.sendemptymessage(down_update);
   if (numread <= 0) {
  // 下载完成 - 将临时下载文件转成apk文件
  if (tmpfile.renameto(apkfile)) {
    // 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 (malformedurlexception e) {
 error_msg.what=down_error;
 error_msg.arg1=1;
 mhandler.sendmessage(error_msg);
 e.printstacktrace();
   } catch (ioexception e) {
 error_msg.what=down_error;
 error_msg.arg1=2;
 mhandler.sendmessage(error_msg);
 e.printstacktrace();
   }
 }
  };
  /**
   * 下载apk
   * @param url
   */
  private void downloadapk() {
 downloadthread = new thread(mdownapkrunnable);
 downloadthread.start();
  }
  /**
   * 安装apk
   * @param url
   */
  private void installapk() {
 file apkfile = new file(apkfilepath);
 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);
  }
}