Android开发获取网络信息的方法

释放双眼,带上耳机,听听看~!

 

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);
}
}

 

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