應用升級大致步驟：
檢測是否有更新（讀取服務器config文件，比對版本號）
若發現高版本則讀取更新文件updateinfo.xml獲取下載更新相關信息
校驗信息確認升級後，下載apk
下載完apk後，進行MD5檢驗apk的完整性
安裝apk
升級入口
private void upgrade() {
//需要訪問網絡，避免主線程堵塞
new Thread(){
public void run() {
if(checkUpdate()){//檢查更新
handler.sendEmptyMessage(20);//通知界面提示有版本更新
}
};
}.start();
}
private boolean checkUpdate(){
String url = PATH_SERVER + "upgrade/config";
//從config文件讀取Version信息，和UpdateInfo.xml文件地址
try {
updateInfoMap = ParseUpdateFile.getConfigInfo(url);
} catch (Exception e) {
e.printStackTrace();
}
//獲取當前apk的版本號
PackageInfo packageInfo = null;
try {
packageInfo = MainActivity.this.getPackageManager().getPackageInfo(MainActivity.this.getPackageName(), 0);
} catch (Exception e) {
e.printStackTrace();
}
int updateVCode = Integer.valueOf(updateInfoMap.get("Version"));
//服務器端apk版本高於現在的版本，則讀取updateinfo.xml文件
if(updateVCode > packageInfo.versionCode){
url = PATH_SERVER+"upgrade/updateinfo.xml";
try {
updateInfoMap.putAll(ParseXmlUtil.parseXml(url));
} catch (Exception e) {
e.printStackTrace();
}
//輸出讀取結果
Set<String> set = updateInfoMap.keySet();
System.out.println("map.size():"+updateInfoMap.size());
for (Iterator<String> iterator = set.iterator(); iterator.hasNext();) {
String string = (String) iterator.next();
System.out.println(string + "——>" + updateInfoMap.get(string));
}
//檢查信息合法性，通過則發送可更新消息
return checkUpdateInfo(updateInfoMap);
}
return false;
}解析config文件
public static Map<String,String> getConfigInfo(String strURL) throws Exception {
Map<String,String> configMap = new HashMap<String, String>();
URL url = new URL(strURL);
URLConnection conn = url.openConnection();
if (conn == null) {
return configMap;
}
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
while (null != (str=bufferedReader.readLine())) {
if (str != null) {
if (str.contains("Version=")) {
configMap.put("Version", str.substring(str.indexOf("=")+1));
}
if (str.contains("VersionServer")) {
configMap.put("VersionServer", str.substring(str.indexOf("::")+2));
}
}
}
bufferedReader.close();
return configMap;
}checkUpdateInfo（）主要校驗信息的合法性
private boolean checkUpdateInfo(Map<String, String> updateInfoMap){
String downloadPath = updateInfoMap.get("DownloadPath");
String packageName = updateInfoMap.get("packageName");
String versionCode = updateInfoMap.get("versionCode");
String updateVCode = updateInfoMap.get("Version");
if (checkUrl(downloadPath)//檢測是否可訪問
&& versionCode.equals(updateVCode)//config和updateinfoxml文件中版本號是否一致
&& packageName.equals(getPackageName())) {//包名
return true;
}
return false;
}下載文件到設備需要權限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
private void downLoadAPK(){
new Thread() {
public void run() {
String downLoadPath = updateInfoMap.get("DownloadPath");
String downLoadDir = "/acfg/";
File fileDir = new File(downLoadDir);
if (!fileDir.exists()) {
fileDir.mkdir();//創建文件夾
}
String fileName = downLoadDir + downLoadPath.substring(downLoadPath.lastIndexOf("/")+1);
File file = new File(fileName);
if (file.exists()) {
file.delete();//先刪除之前已存在的文件
}
try {
file.createNewFile();
URL url = new URL(downLoadPath);// 構造URL
URLConnection con = url.openConnection();// 打開連接
int contentLength = con.getContentLength();// 獲得文件的長度
System.out.println("長度 :" + contentLength);
InputStream is = con.getInputStream();// 輸入流
byte[] bs = new byte[1024];// 1K的數據緩衝
int len;// 讀取到的數據長度
OutputStream os = new FileOutputStream(fileName);// 輸出的文件流
// 開始讀取
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
// 完畢，關閉所有鏈接
os.close();
is.close();
//保存文件路徑，方便升級時使用
updateInfoMap.put("fileName", fileName);
} catch (Exception e) {
e.printStackTrace();
handler.sendEmptyMessage(22);//下載失敗
}
handler.sendEmptyMessage(21);//通知界面下載完成
};
}.start();
}下載完成後覈對apk的MD5值
File file = new File(fileName);
String fileMD5 = MD5Util.getMD5OfFile(file);
if (fileMD5.equals(activity.updateInfoMap.get("md5sum"))) {
Toast.makeText(activity, "Download Finished. It's ready to update!", Toast.LENGTH_LONG).show();
activity.update(fileName);
}獲取文件的MD5值
public static String getMD5OfFile(File file) {
String value = null;
FileInputStream in = null;
try {
in = new FileInputStream(file);
MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(byteBuffer);
BigInteger bi = new BigInteger(1, md5.digest());
value = bi.toString(16).toUpperCase(Locale.ENGLISH);//轉爲大寫
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != in) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return value;
}安裝下載好的apk
private void update(String filePath) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(filePath)), "application/vnd.android.package-archive");
startActivity(intent);
}安裝時會提示“解析包時出現問題”，經過測試發現是下載到設備的apk文件的權限問題
故而在安裝前先修改apk的權限
private void update(String filePath) {
String cmd = "chmod 755 " + filePath;
try {
Runtime.getRuntime().exec(cmd);
} catch (Exception e) {
e.printStackTrace();
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(filePath)), "application/vnd.android.package-archive");
startActivity(intent);
}安裝完成後進入應用