android在线版本更新源代码（update,json解析带注释）

package com.android.Update; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.webkit.URLUtil; import android.widget.Toast; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import java.util.Properties; import org.json.JSONArray; import org.json.JSONObject; public class UpdateActivity extends Activity { private static final String TAG = "DOWNLOADAPK"; private String PastVersion;//旧版本号 private String NowVersion;//新版本号 public ProgressDialog pBar; //进度条 private String currentFilePath = ""; //文件 //预安装软件的扩展名 private String fileEx=""; private String fileNa="";//软件名称 //APK下载地址 //TODO 这里要自定义 private String strURL="http://open.sina.com.cn/update.apk"; //版本更新配置文件URi //TODO 这里也是 private String VersionUri ="http://open.sina.com.cn/update.json"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(Menu.NONE, Menu.FIRST + 1, 5, "检测更新").setIcon( android.R.drawable.ic_menu_upload); menu.add(Menu.NONE,Menu.FIRST+2,4,"退出").setIcon(android.R.drawable.ic_menu_delete); return true; } //处理下载URL文件自定义的函数 private void getFile(final String strPath) { pBar.show(); try { if (strPath.equals(currentFilePath) ) { getDataSource(strPath); } currentFilePath = strPath; Runnable r = new Runnable() { public void run() { try { getDataSource(strPath); } catch (Exception e) { Log.e(TAG, e.getMessage(), e); } } }; new Thread(r).start(); } catch(Exception e) { e.printStackTrace(); } } /*取得远程文件*/ private void getDataSource(String strPath) throws Exception { if (!URLUtil.isNetworkUrl(strPath)) { Log.d("Tag","error"); } else { /*取得URL*/ URL myURL = new URL(strPath); /*建立联机*/ URLConnection conn = myURL.openConnection(); conn.connect(); /*InputStream 下载文件*/ InputStream is = conn.getInputStream(); if (is == null) { Log.d("tag","error"); throw new RuntimeException("stream is null"); } /*建立临时文件*/ File myTempFile = File.createTempFile(fileNa, "."+fileEx); myTempFile.getAbsolutePath(); /*将文件写入临时盘*/ FileOutputStream fos = new FileOutputStream(myTempFile); byte buf[] = new byte[128]; do { int numread = is.read(buf); if (numread <= 0) { break; } fos.write(buf, 0, numread); }while (true); /*打开文件进行安装*/ openFile(myTempFile); //openFile(c); try { is.close(); } catch (Exception ex) { Log.d("Tag","error"); Log.e(TAG, "error: " + ex.getMessage(), ex); } } } /* 在手机上打开文件的method */ private void openFile(File f) { pBar.cancel(); Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW); /* 调用getMIMEType()来取得MimeType */ String type = getMIMEType(f); /* 设定intent的file与MimeType */ intent.setDataAndType(Uri.fromFile(f),type); startActivity(intent); } /* 判断文件MimeType的method */ private String getMIMEType(File f) { String type=""; String fName=f.getName(); /* 取得扩展名 */ String end=fName.substring(fName.lastIndexOf(".")+1,fName.length()).toLowerCase(); /* 按扩展名的类型决定MimeType */ if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")||end.equals("xmf")||end.equals("ogg")||end.equals("wav")) { type = "audio"; } else if(end.equals("3gp")||end.equals("mp4")) { type = "video"; } else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||end.equals("jpeg")||end.equals("bmp")) { type = "image"; } else if(end.equals("apk")) { /* android.permission.INSTALL_PACKAGES */ type = "application/vnd.android.package-archive"; } else { type="*"; } /*如果无法直接打开，就跳出软件清单给使用者选择 */ if(end.equals("apk")) { } else { type += "/*"; } return type; } private void delFile(String strFileName) { File myFile = new File(strFileName); if(myFile.exists()) { myFile.delete(); } } @Override public boolean onOptionsItemSelected(MenuItem item) { try { String jsonversion = NetworkTool.getContent(VersionUri); Log.d(TAG, "verjson:"+jsonversion); JSONArray array = new JSONArray(jsonversion); // 解析Version网页，获取版本号 if (array.length() > 0) { JSONObject obj = array.getJSONObject(0); NowVersion = obj.getString("verCode"); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } // 装载获取当前的版本号 load(); //当有最新版本的时候 Log.d("update", "pastVersion:"+PastVersion+"&&Nowversion:"+NowVersion); if(PastVersion != null&&!(PastVersion.equals(NowVersion))) { save(); Dialog dialog = new AlertDialog.Builder(UpdateActivity.this).setTitle("系统更新") .setMessage("发现新版本，请更新！")// 设置内容 .setPositiveButton("确定",// 设置确定按钮 new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { pBar = new ProgressDialog(UpdateActivity.this); pBar.setTitle("正在下载"); pBar.setMessage("请稍候..."); pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER); fileEx = strURL.substring(strURL.lastIndexOf(".")+1,strURL.length()).toLowerCase(); fileNa = strURL.substring(strURL.lastIndexOf("/")+1,strURL.lastIndexOf(".")); getFile(strURL); } }).setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // 点击"取消"按钮之后退出程序 } }).create();// 创建 // 显示对话框 dialog.show(); } // else{ save(); Toast.makeText(this, "当前为最新版本", Toast.LENGTH_LONG).show(); } return false; } @Override public void onOptionsMenuClosed(Menu menu) { // Toast.makeText(this, "选项菜单关闭了", Toast.LENGTH_LONG).show(); } @Override public boolean onPrepareOptionsMenu(Menu menu) { // Toast.makeText(this, // "选项菜单显示之前onPrepareOptionsMenu方法会被调用，你可以用此方法来根据打当时的情况调整菜单", // Toast.LENGTH_LONG).show(); // 如果返回false，此方法就把用户点击menu的动作给消费了，onCreateOptionsMenu方法将不会被调用 return true; } boolean load () { Properties properties = new Properties(); try { FileInputStream stream = this.openFileInput("Versionfile.cfg"); //读