Move Google Maps API key to a resource string, check to see if it's empty and crash if so.

Author: rogerhu

app/src/main/AndroidManifest.xml

@@ -45,7 +45,7 @@
 
         <meta-data
             android:name="com.google.android.maps.v2.API_KEY"
-            android:value="YOUR-API-KEY-HERE" />
+            android:value="@string/google_maps_api_key" />
 
         <meta-data
             android:name="com.google.android.gms.version"

app/src/main/java/com/example/mapdemo/MapDemoActivity.java

@@ -1,21 +1,8 @@
 package com.example.mapdemo;
 
-import android.app.Activity;
-import android.app.Dialog;
-import android.content.Intent;
-import android.content.IntentSender;
-import android.location.Location;
-import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
-import android.support.v4.app.FragmentActivity;
-import android.support.v7.app.AppCompatActivity;
-import android.util.Log;
-import android.widget.Toast;
-
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.GooglePlayServicesUtil;
 import com.google.android.gms.common.api.GoogleApiClient;
-import com.google.android.gms.location.LocationListener;
 import com.google.android.gms.location.LocationRequest;
 import com.google.android.gms.location.LocationServices;
 import com.google.android.gms.maps.CameraUpdate;
@@ -25,6 +12,18 @@
 import com.google.android.gms.maps.SupportMapFragment;
 import com.google.android.gms.maps.model.LatLng;
 
+import android.app.Activity;
+import android.app.Dialog;
+import android.content.Intent;
+import android.content.IntentSender;
+import android.location.Location;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.app.AppCompatActivity;
+import android.text.TextUtils;
+import android.util.Log;
+import android.widget.Toast;
+
 import permissions.dispatcher.NeedsPermission;
 import permissions.dispatcher.RuntimePermissions;
 
@@ -52,6 +51,10 @@ protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.map_demo_activity);
 
+		if (TextUtils.isEmpty(getResources().getString(R.string.google_maps_api_key))) {
+			throw new IllegalStateException("You forgot to supply a Google Maps API key");
+		}
+
 		mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map));
 		if (mapFragment != null) {
 			mapFragment.getMapAsync(new OnMapReadyCallback() {

app/src/main/res/values/strings.xml

@@ -4,5 +4,5 @@
     <string name="app_name">Map Demo</string>
     <string name="hello_world">Hello world!</string>
     <string name="menu_settings">Settings</string>
-
+    <string name="google_maps_api_key"></string>
 </resources>