Can't see the map from the HelloWorld example ArcGIS android SDK
<p>I tried the Hello World code from ArcGIS android SDK and followed all the steps but the map doesn't appear and instead I get a black mapview.</p>

<p>Here is the java code :</p>

<pre><code>package com.example.user.arcgismap;

import android.app.Activity;
import android.os.Bundle;
import com.esri.android.map.MapView;

public class MainActivity extends Activity {
MapView mMapView;

// Called when the activity is first created.
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.content_main);

    // After the content of this Activity is set, the map can be accessed programmatically from the layout.
    mMapView = (MapView) findViewById(R.id.map);
}

@Override
protected void onPause() {
    super.onPause();

    // Call MapView.pause to suspend map rendering while the activity is paused, which can save battery usage.
    if (mMapView != null)
    {
        mMapView.pause();
    }
}

@Override
protected void onResume() {
    super.onResume();

    // Call MapView.unpause to resume map rendering when the activity returns to the foreground.
    if (mMapView != null)
    {
        mMapView.unpause();
    }
}
} 
</code></pre>

<p>and here is the xml layout :</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.user.arcgismap.MainActivity"
tools:showIn="@layout/activity_main"&gt;

&lt;com.esri.android.map.MapView
android:id="@+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
mapoptions.MapType="streets"
mapoptions.center="34.056215, -117.195668,"
mapoptions.ZoomLevel="16"&gt;
&lt;/com.esri.android.map.MapView&gt;
&lt;/RelativeLayout&gt;
</code></pre>

<p>can anyone help, what am I doing wrong ?</p>