整理文档，搜刮出一个Android应用程序更新并下载实例的代码，稍微整理精简一下做下分享。
创建一个新类，名为UpdateManager，代码如下：
import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import com.af.mobile.R; 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.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.Toast; public class UpdateManager {private URL url=null; /* 下载中 */ private static final int DOWNLOAD = 1; /* 下载结束 */ private static final int DOWNLOAD_FINISH = 2; /* 保存解析的XML信息 */ //HashMap<String, String> mHashMap; /* 下载保存路径 */ private String mSavePath; /* 记录进度条数量 */ private int progress; /* 是否取消更新 */ private boolean cancelUpdate = false; private Context mContext; /* 更新进度条 */ private ProgressBar mProgress; private Dialog mDownloadDialog; private Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { // 正在下载 case DOWNLOAD: // 设置进度条位置 mProgress.setProgress(progress); break; case DOWNLOAD_FINISH: // 安装文件 installApk(); break; default: break; } }; }; public UpdateManager(Context context) { this.mContext = context; } public void checkUpdate() { if (isUpdate()) { showNoticeDialog(); } else { } } /** * 检查软件是否有更新版本 * * @return */ private boolean isUpdate() { // 获取当前软件版本 Double versionCode = getVersionCode(mContext); Double serviceCode = 1.2; // 版本判断 if (serviceCode > versionCode) { return true; } return false; } // 获取软件版本号 private Double getVersionCode(Context context) { Double versionCode = 0.0; try { // 获取软件版本号，对应AndroidManifest.xml下android:versionCode versionCode = (double) context.getPackageManager().getPackageInfo("com.af.mobile", 0).versionCode; } catch (NameNotFoundException e) { e.printStackTrace(); } return versionCode; } //显示软件更新对话框 private void showNoticeDialog() { AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("软件更新"); String string=download("http://192.168.0.102:9313/daojuserver/uploads/version.xml");//xml的下载地址 builder.setMessage(string); builder.setPositiveButton("更新", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); // 显示下载对话框 showDownloadDialog(); } }); // 稍后更新 builder.setNegativeButton("稍后更新", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); Dialog noticeDialog = builder.create(); noticeDialog.show(); } // 显示软件下载对话框 private void showDownloadDialog() { // 构造软件下载对话框 AlertDialog.Builder builder = new Builder(mContext); builder.setTitle("djfkjd");//提示信息内容 // 给下载对话框增加进度条 final LayoutInflater inflater = LayoutInflater.from(mContext); View v = inflater.inflate(R.layout.softupdate_progress, null); mProgress = (ProgressBar) v.findViewById(R.id.update_progress); builder.setView(v); // 取消更新 builder.setNegativeButton("取消更新", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); // 设置取消状态 cancelUpdate = true; } }); mDownloadDialog = builder.create(); mDownloadDialog.show(); // 现在文件 downloadApk(); } private void downloadApk() { // 启动新线程下载软件 new downloadApkThread().start(); } private class downloadApkThread extends Thread { @Override public void run() { try { // 判断SD卡是否存在，并且是否具有读写权限 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { // 获得存储卡的路径 String sdpath = Environment.getExternalStorageDirectory() + "/"; mSavePath = sdpath + "download"; URL url = new URL("http://192.168.0.102:9313/daojuserver/uploads/SpMobile.apk");//apk下载地址地址 // 创建连接 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.connect(); // 获取文件大小 int length = conn.getContentLength(); // 创建输入流 InputStream is = conn.getInputStream(); File file = new File(mSavePath); if (!file.exists()) { file.mkdir(); } File apkFile = new File(mSavePath, "dhfudh"); FileOutputStream fos = new FileOutputStream(apkFile); int count = 0; // 缓存 byte buf[] = new byte[1024]; // 写入到文件中 do { int numread = is.read(buf); count += numread; // 计算进度条位置 progress = (int) (((float) count / length) * 100); // 更新进度 mHandler.sendEmptyMessage(DOWNLOAD); if (numread <= 0) { mHandler.sendEmptyMessage(DOWNLOAD_FINISH); break; } fos.write(buf, 0, numread); } while (!cancelUpdate); fos.close(); is.close(); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // 取消下载对话框显示 mDownloadDialog.dismiss(); } }; private void installApk() { File apkfile = new File(mSavePath, "dhfudh"); if (!apkfile.exists()) { return; } // 通过Intent安装APK文件 Intent i = new Intent(Intent.ACTION_VIEW); i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive"); mContext.startActivity(i); } public String download(String urlString) { StringBuffer sbBuffer=new StringBuffer(); String line=null; BufferedReader buffer=null; try { url=new URL(urlString); HttpURLConnection urlConn=(HttpURLConnection) url.openConnection(); buffer=new BufferedReader(new InputStreamReader(urlConn.getInputStream())); while((line=buffer.readLine())!=null) { sbBuffer.append(line); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { try { buffer.close(); } catch (Exception e2) { // TODO: handle exception e2.printStackTrace(); } } return sbBuffer.toString(); } }
在Android应用程序Main界面
if(isOpenNetwork())//判断是否有网络 { UpdateManager manager = new UpdateManager(Main.this); // 检查软件更新 manager.checkUpdate(); }
判断移动端是否有网络
private boolean isOpenNetwork() { ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connManager.getActiveNetworkInfo(); if (networkInfo != null) { // 2.获取当前网络连接的类型信息 int networkType = networkInfo.getType(); if (ConnectivityManager.TYPE_WIFI == networkType) { // 当前为wifi网络 } else if (ConnectivityManager.TYPE_MOBILE == networkType) { // 当前为mobile网络 } return connManager.getActiveNetworkInfo().isAvailable(); } return false; }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。