I believe you have changed this:

<?xml version="1.0" encoding="utf-8"?>

For this:

<?xml version="2.0" encoding="utf-8"?>

It is not correct because this is the version of the XML that is used in AndroidManifest . It is necessary to keep as is.

To increment the version of your application you need to define and modify two properties, but how this is done depends on how you are doing the application.

The two properties that say the version of your application are android:versionCode and android:versionName .

VersionCode

VersionCode is an integer that represents the version of your application code, relative to other versions. You can even programmatically generate this value, it's just a number that says when one application is newer than another. It has no relation to the version the user sees.

It is only used by Google Play and other stores, to know that you have been upgraded to apk

You can use the rule you want, even having spaces between versions. From experience I always increment by 1 with each update. If you upload an already used version, Google Play will reject your upload .

VersionName

The VersionName is a String that represents the release version of your application. You can use the common notation of <major>.<minor>.<point> (eg: 2.0.1) or any other form you find convenient. As a String you follow the order you want, which makes no difference. (The only problem is to confuse the user.)

This is the version that the user actually observes in stores.

As I've mentioned, the configuration will depend on how you build your apk.

If you use ADT

Only modify the android:versionCode and android:versionName attributes in your manifest tag:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.package.name"
    android:versionCode="2" <!-- Valor que as lojas usam para identificar que houve uma atualizacao -->
    android:versionName="1.1"> <!-- Valor que aparece para o usuario -->

    <application android:icon="@drawable/icon" android:label="@string/app_name">
    ...
    </application>
</manifest>

If you use Gradle

With Gradle, you can set versionCode and versionName to build.gradle , but remember that it will always override the value of the manifest tag. Otherwise it is the value of the manifest tag that will prevail.

Configuration example:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.0"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
        versionCode 1        # Valor que as lojas usam para identificar que houve uma atualizacao
        versionName "1.0"    # Valor que aparece para o usuario
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

It's worth looking at the references for a better understanding.

References:

• link
• link