Android提示版本更新操作流程
2014年5月8日：
andorid的app应用中都会有版本更新的操作,今天空闲的时候就花了点心思弄了一下，主要技术方面用到了AsyncTask异步加载、http协议、json解析、获取版本号等。。。
下面就来介绍一下大概的流程吧，首先呢：
activity_main.xml：
<Button android:id="@+id/chek_newest_version" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:text="检测最新版本"/>
这里我就只用了一个按钮了！
接下来mainactivity代码：
启动了异步加载来处理的，如果旧版本小于新版本号，就开始执行下载操作，否则就不更新！
一步步看吧！
public class MainActivity extends Activity { Button m_btnCheckNewestVersion; long m_newVerCode; //最新版的版本号 String m_newVerName; //最新版的版本名 String m_appNameStr; //下载到本地要给这个APP命的名字 Handler m_mainHandler; ProgressDialog m_progressDlg; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化相关变量 initVariable(); m_btnCheckNewestVersion.setOnClickListener(btnClickListener); } private void initVariable() { m_btnCheckNewestVersion = (Button)findViewById(R.id.chek_newest_version); m_mainHandler = new Handler(); m_progressDlg = new ProgressDialog(this); m_progressDlg.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); // 设置ProgressDialog 的进度条是否不明确 false 就是不设置为不明确 m_progressDlg.setIndeterminate(false); m_appNameStr = "haha.apk"; } OnClickListener btnClickListener = new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub new checkNewestVersionAsyncTask().execute(); } }; class checkNewestVersionAsyncTask extends AsyncTask<Void, Void, Boolean> { @Override protected Boolean doInBackground(Void... params) { // TODO Auto-generated method stub if(postCheckNewestVersionCommand2Server()) { int vercode = Common.getVerCode(getApplicationContext()); // 用到前面第一节写的方法 if (m_newVerCode > vercode) { return true; } else { return false; } } return false; } @Override protected void onPostExecute(Boolean result) { // TODO Auto-generated method stub if (result) {//如果有最新版本 doNewVersionUpdate(); // 更新新版本 }else { notNewVersionDlgShow(); // 提示当前为最新版本 } super.onPostExecute(result); } @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); } } /** * 从服务器获取当前最新版本号，如果成功返回TURE，如果失败，返回FALSE * @return */ private Boolean postCheckNewestVersionCommand2Server() { StringBuilder builder = new StringBuilder(); JSONArray jsonArray = null; try { // 构造POST方法的{name:value} 参数对 List<NameValuePair> vps = new ArrayList<NameValuePair>(); // 将参数传入post方法中 vps.add(new BasicNameValuePair("action", "checkNewestVersion")); builder = Common.post_to_server(vps); Log.e("msg", builder.toString()); jsonArray = new JSONArray(builder.toString()); if (jsonArray.length()>0) { if (jsonArray.getJSONObject(0).getInt("id") == 1) { m_newVerName = jsonArray.getJSONObject(0).getString("verName"); m_newVerCode = jsonArray.getJSONObject(0).getLong("verCode"); return true; } } return false; } catch (Exception e) { Log.e("msg",e.getMessage()); m_newVerName=""; m_newVerCode=-1; return false; } } /** * 提示更新新版本 */ private void doNewVersionUpdate() { int verCode = Common.getVerCode(getApplicationContext()); String verName = Common.getVerName(getApplicationContext()); String str= "当前版本："+verName+" Code:"+verCode+" ,发现新版本："+m_newVerName+ " Code:"+m_newVerCode+" ,是否更新？"; Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新").setMessage(str) // 设置内容 .setPositiveButton("更新",// 设置确定按钮 new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { m_progressDlg.setTitle("正在下载"); m_progressDlg.setMessage("请稍候..."); downFile(Common.UPDATESOFTADDRESS); //开始下载 } }) .setNegativeButton("暂不更新", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // 点击"取消"按钮之后退出程序 finish(); } }).create();// 创建 // 显示对话框 dialog.show(); } /** * 提示当前为最新版本 */ private void notNewVersionDlgShow() { int verCode = Common.getVerCode(this); String verName = Common.getVerName(this); String str="当前版本:"+verName+" Code:"+verCode+",/n已是最新版,无需更新!"; Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新") .setMessage(str)// 设置内容 .setPositiveButton("确定",// 设置确定按钮 new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).create();// 创建 // 显示对话框 dialog.show(); } private void downFile(final String url) { m_progressDlg.show(); new Thread() { public void run() { HttpClient client = new DefaultHttpClient(); HttpGet get = new HttpGet(url); HttpResponse response; try { response = client.execute(get); HttpEntity entity = response.getEntity(); long length = entity.getContentLength(); m_progressDlg.setMax((int)length);//设置进度条的最大值 InputStream is = entity.getContent(); FileOutputStream fileOutputStream = null; if (is != null) { File file = new File( Environment.getExternalStorageDirectory(), m_appNameStr); fileOutputStream = new FileOutputStream(file); byte[] buf = new byte[1024]; int ch = -1; int count = 0; while ((ch = is.read(buf)) != -1) { fileOutputStream.write(buf, 0, ch); count += ch; if (length > 0) { m_progressDlg.setProgress(count); } } } fileOutputStream.flush(); if (fileOutputStream != null) { fileOutputStream.close(); } down(); //告诉HANDER已经下载完成了，可以安装了 } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }.start(); } /** * 告诉HANDER已经下载完成了，可以安装了 */ private void down() { m_mainHandler.post(new Runnable() { public void run() { m_progressDlg.cancel(); update(); } }); } /** * 安装程序 */ void update() { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new File(Environment .getExternalStorageDirectory(), m_appNameStr)), "application/vnd.android.package-archive"); startActivity(intent); }}
最后是Common.java类:
类似一个工具类，很多方法都写在这里面，下载完成后，开始执行安装的操作！
public class Common { public static final String SERVER_IP="http://192.168.1.105/"; public static final String SERVER_ADDRESS=SERVER_IP+"try_downloadFile_progress_server/index.php";//软件更新包地址 public static final String UPDATESOFTADDRESS=SERVER_IP+"try_downloadFile_progress_server/update_pakage/baidu.apk";//软件更新包地址 /** * 向服务器发送查询请求，返回查到的StringBuilder类型数据 * * @param ArrayList * <NameValuePair> vps POST进来的参值对 * @return StringBuilder builder 返回查到的结果 * @throws Exception */ public static StringBuilder post_to_server(List<NameValuePair> vps) { DefaultHttpClient httpclient = new DefaultHttpClient(); try { HttpResponse response = null; // 创建httpost.访问本地服务器网址 HttpPost httpost = new HttpPost(SERVER_ADDRESS); StringBuilder builder = new StringBuilder(); httpost.setEntity(new UrlEncodedFormEntity(vps, HTTP.UTF_8)); response = httpclient.execute(httpost); // 执行 if (response.getEntity() != null) { // 如果服务器端JSON没写对，这句是会出异常，是执行不过去的 BufferedReader reader = new BufferedReader( new InputStreamReader(response.getEntity().getContent())); String s = reader.readLine(); for (; s != null; s = reader.readLine()) { builder.append(s); } } return builder; } catch (Exception e) { // TODO: handle exception Log.e("msg",e.getMessage()); return null; } finally { try { httpclient.getConnectionManager().shutdown();// 关闭连接 // 这两种释放连接的方法都可以 } catch (Exception e) { // TODO Auto-generated catch block Log.e("msg",e.getMessage()); } } } /** * 获取软件版本号 * @param context * @return */ public static int getVerCode(Context context) { int verCode = -1; try { //注意："com.example.try_downloadfile_progress"对应AndroidManifest.xml里的package="……"部分 verCode = context.getPackageManager().getPackageInfo( "com.example.try_downloadfile_progress", 0).versionCode; } catch (NameNotFoundException e) { Log.e("msg",e.getMessage()); } return verCode; } /** * 获取版本名称 * @param context * @return */ public static String getVerName(Context context) { String verName = ""; try { verName = context.getPackageManager().getPackageInfo( "com.example.try_downloadfile_progress", 0).versionName; } catch (NameNotFoundException e) { Log.e("msg",e.getMessage()); } return verName; } 已经贴完毕！