Android下载更新代码 _Android

少年乘勇气，百战过乌孙。这篇文章主要讲述Android下载更新代码相关的知识，希望能为你提供帮助。
其实是昨天反编译一个apk，给它添加一个自动更新的功能用到的。为了在smali下方便查看，代码写的不规范，反正到了smali都一个吊样~~~~

权限： < uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> < uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> < uses-permission android:name="android.permission.INTERNET"/>

//Start=========== public void updata(){ new Thread(){ @Override public void run() { request(apiUrl); } }.start(); } String newapkName = "updata.apk"; String apiUrl = "http://192.168.1.101:8080/udate.txt"; //请求接口 public void request(String Httpurl){ URL url = null; try { url = new URL(Httpurl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); InputStream is = conn.getInputStream(); String s = toString(is); JSONObject jsonObject = new JSONObject(s); Double versionCode = jsonObject.getDouble("versionCode"); //远程版本 String versionName = getVersionName(); double v = Double.parseDouble(versionName); if(versionCode > v){ //更新下载 downLoadFile(jsonObject.getString("updateurl")); } } catch (Exception e) { e.printStackTrace(); }} Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch (msg.what){ case 1: ShowUpdataDilg(); break; } } }; //版本提示对话框 public void ShowUpdataDilg() { new AlertDialog.Builder(MainActivity.this) .setTitle("提示") .setMessage("是否安装最新版本？ ") .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Uodate(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) {} }) .show(); }//获取版本 private String getVersionName() throws Exception { PackageManager packageManager = getPackageManager(); // getPackageName()是你当前类的包名，0代表是获取版本信息 PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),0); String version = packInfo.versionName; return version; }//安装apk public void Uodate(){ //String str = "/" + newapkName; //String fileName = Environment.getExternalStorageDirectory() + str; //Intent intent = new Intent(Intent.ACTION_VIEW); //intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive"); //startActivity(intent); String str = "/sdcard/update/" + newapkName; Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new File(str)), "application/vnd.android.package-archive"); startActivity(intent); }//对话框确定 public void isUpdate(){ String str = "/" + newapkName; String fileNames = Environment.getExternalStorageDirectory() + str; Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new File(fileNames)), "application/vnd.android.package-archive"); startActivity(intent); }protected File downLoadFile(String httpUrl) { File tmpFile = new File("/sdcard/update"); if (!tmpFile.exists()) { tmpFile.mkdir(); } final File file = new File("/sdcard/update/" + newapkName); try { URL url = new URL(httpUrl); try { HttpURLConnection conn = (HttpURLConnection) url.openConnection(); InputStream is = conn.getInputStream(); FileOutputStream fos = new FileOutputStream(file); byte[] buf = new byte[256]; conn.connect(); double count = 0; if (conn.getResponseCode() > = 400) { Toast.makeText(MainActivity.this, "连接超时", Toast.LENGTH_SHORT).show(); } else { while (count < = 100) { if (is != null) { int numRead = is.read(buf); if (numRead < = 0) { break; } else { fos.write(buf, 0, numRead); } } else { break; } } } fos.close(); is.close(); conn.disconnect(); //下载成功 handler.sendEmptyMessage(1); } catch (IOException e) { e.printStackTrace(); } } catch (MalformedURLException e) { e.printStackTrace(); } return file; } //输入流转换为String public String toString(InputStream is) { String result = null; try { //构造一个输出流(字节队列输出流) ByteArrayOutputStream baos = new ByteArrayOutputStream(); //一个byte数组，用来存储得到的字节数据 byte[] bys = new byte[1024]; int len = 0; //循环读出完整字节数据 while((len = is.read(bys)) != -1) { baos.write(bys,0,len); } //byte数据转换为字符串 result = new String(baos.toByteArray()); is.close(); baos.close(); } catch (IOException e) { e.printStackTrace(); } return result; } //End===========

【Android下载更新代码】