获取应用的当前版本号&获取当前android系统的版本号

   private String getVersionName() throws Exception
   {
           // 获取packagemanager的实例
           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;
   }

 textView.setText("Product Model: " + android.os.Build.MODEL + "," 
                + android.os.Build.VERSION.SDK + "," 
                + android.os.Build.VERSION.RELEASE); 

    /*  
     * 
     * Build.VERSION_CODES
        1 (0x00000001)           Android 1.0             BASE
        2 (0x00000002)           Android 1.1             BASE_1_1
        3 (0x00000003)           Android 1.5             CUPCAKE
        4 (0x00000004)           Android 1.6             DONUT
        5 (0x00000005)           Android 2.0             ECLAIR
        6 (0x00000006)           Android 2.0.1           ECLAIR_0_1
        7 (0x00000007)           Android 2.1             ECLAIR_MR1
        8 (0x00000008)           Android 2.2             FROYO
        9 (0x00000009)           Android 2.3             GINGERBREAD
        10 (0x0000000a)          Android 2.3.3           GINGERBREAD_MR1
        11 (0x0000000b)          Android 3.0             HONEYCOMB
        12 (0x0000000c)          Android 3.1             HONEYCOMB_MR1
        13 (0x0000000d)          Android 3.2             HONEYCOMB_MR2
        14 (0x0000000e)          Android 4.0             ICE_CREAM_SANDWICH
        15 (0x0000000f)          Android 4.0.3           ICE_CREAM_SANDWICH_MR1
        16 (0x00000010)          Android 4.1             JELLY_BEAN
        17 (0x00000011)          Android 4.2             JELLY_BEAN_MR1
        18 (0x00000012)          Android 4.3             JELLY_BEAN_MR2
        19 (0x00000013)          Android 4.4             KITKAT
    */
    /*获取当前系统的android版本号*/
    int currentapiVersion = android.os.Build.VERSION.SDK_INT;