title: Map activity does not show up in my phone because I have many activities
body: <p>I created new activity which is map activity. I think I have problem in <code>AndroidManofest.xml</code>.
  My phone works perfectly if I create new project with just map activity. If I add it to my project, which has a lot of activities, it does not work. I do not know why.</p>
  
  <p>the problem is about the activities 
    AndroidManofest.xml</p>
  
  <p>I checked every thing APU is enable</p>
  
  <p><strong>AndroidManofest.xml</strong></p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.abdullahalhajri.smarttutor"&gt;
  
      &lt;!--
           The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
           Google Maps Android API v2, but you must specify either coarse or fine
           location permissions for the 'MyLocation' functionality. 
      --&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /&gt;
      &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
      &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
      &lt;uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /&gt;
  
      &lt;application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:supportsRtl="true"
          android:theme="@style/AppTheme"&gt;
          &lt;activity android:name=".activities.LoginActivity"&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
          &lt;activity
              android:name=".activities.RegisterActivity"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.HomePage"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.SearchPage"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.SearchRating"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.SearchSubject"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.MathTutor"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.ReviewComment"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.TutorProfile"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name=".activities.UsersActivity"
              android:screenOrientation="portrait" /&gt;
          &lt;activity
              android:name="com.google.android.gms.ads.AdActivity"
              android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
              android:theme="@android:style/Theme.Translucent" /&gt;
  
          &lt;meta-data
              android:name="com.google.android.gms.version"
              android:value="@integer/google_play_services_version" /&gt;
  
          &lt;!--
               The API key for Google Maps-based APIs is defined as a string resource.
               (See the file "res/values/google_maps_api.xml").
               Note that the API key is linked to the encryption key used to sign the APK.
               You need a different API key for each encryption key, including the release key that is used to
               sign the APK for publishing.
               You can define the keys for the debug and release targets in src/debug/ and src/release/. 
          --&gt;
          &lt;meta-data
              android:name="com.google.android.geo.API_KEY"
              android:value="@string/google_maps_key" /&gt;
  
          &lt;activity
              android:name=".activities.MapsActivity"
              android:label="@string/title_activity_maps"&gt;
  
          &lt;/activity&gt;
      &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p><strong>Error</strong></p>
  
  <pre><code>12-04 04:31:22.639 25820-26431/com.example.abdullahalhajri.smarttutor E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
                                                                                                   Ensure that the "Google Maps Android API v2" is enabled.
                                                                                                   Ensure that the following Android Key exists:
                                                                                                      API Key: &lt;&lt;redacted&gt;&gt;
  </code></pre>