Android实现获取网络信息的方法

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);  }}