Develop Reference

Why are my AdMob ads not shown when I use non-testing IDs?

Recently, I made an android app. After that, I have opened my account in AdMob and entered my app. I have got an App ID and Unit ID. For the first time, I tested my App with testing ID codes from developers.google.com. It worked well. But I have put IDs which are from AdMob in my codes. As a result, It is not displaying.
Here is my Manifest.xml file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.myapp2">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="Lotin-Kirill Converter"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-xxxxxxxxxxxxxxxx~xxxxxxxxxx"/>
<activity
android:name="com.example.myapp2.Splash"
android:screenOrientation="portrait"
tools:ignore="LockedOrientationActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.myapp2.MainActivity">
</activity>
<meta-data
android:name="preloaded_fonts"
android:resource="#array/preloaded_fonts" />
</application>
</manifest>
It is build.gradle(:app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.example.myapp2"
minSdkVersion 16
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'com.google.android.gms:play-services-ads:19.2.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
Here is MainActivity.java
package com.example.myapp2;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.StrictMode;
import android.view.View;
import android.webkit.WebView;
import android.widget.Toast;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;
public class MainActivity extends AppCompatActivity {
WebView view;
AdView mAdview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this, new OnInitializationCompleteListener() {
#Override
public void onInitializationComplete(InitializationStatus initializationStatus) {
}
});
mAdview = (AdView)findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdview.loadAd(adRequest);
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
view = (WebView) this.findViewById(R.id.webView);
view.getSettings().setJavaScriptEnabled(true);
view.getSettings().setDatabaseEnabled(true);
view.getSettings().setDatabasePath("/data/data/" + view.getContext().getPackageName() + "/databases/");
view.getSettings().setDomStorageEnabled(true);
view.getSettings().setLoadsImagesAutomatically(true);
view.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
view.loadUrl("file:///android_asset/test.html");
}
boolean doubleBackToExitPressedOnce = false;
#Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
new AlertDialog.Builder(this)
.setTitle("Lotin-Kirill Converter.")
.setMessage("Dasturdan chiqmoqchimisiz?")
.setPositiveButton("Ha",
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
}).setNegativeButton("Yo'q", null).show();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Iltimos, Dasturdan chiqish uchun yana bir marta bosing!", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000);
}
}
It is activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity">
<WebView
android:id="#+id/webView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
</WebView>
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
app:adSize="BANNER"
app:adUnitId="ca-app-pub-xxxxxxxxxxxxxxxx/xxxxxxxxxx" />
</RelativeLayout>
If you find my mistake, Please help me!
Thank you for your attention!

Newly created admob IDs will not work immediately, you have to wait. From my experience it takes about a day of waiting for the actual IDs to work.
When creating an app that you plan to monetize, create the admob IDs and Ad units ahead of time. You can edit its details later but the IDs will definitely be working when its time for testing and implementing them.

Have you set up any Mediation Group?
If no, then create one.
If yes, then you just have to wait until your request is populated. Will take up some time up to a couple of days.

try to test your admob enabled app in other devices. Admob has trouble loading real ads in devices that used for testing it. Also it may take a while for ads to appear

unable to write to firebase database

I'm making an app which can write to firebase database on button click.
The app is working on emulator but it's not working on my physical device.
Here's the main activity code:
public class MainActivity extends AppCompatActivity {
private Firebase fled1;
Button on;
Button off;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Firebase.setAndroidContext(this);
on= findViewById(R.id.on);
off= findViewById(R.id.off);
on.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
fled1 = new Firebase("https://iotapp-6y3n8.firebaseio.com/");
Firebase fled1Child = fled1.child("S1");
fled1Child.setValue("1");
}
});
off.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
fled1 = new Firebase("https://iotapp-6y3n8.firebaseio.com/");
Firebase fled1Child = fled1.child("S1");
fled1Child.setValue("0");
}
});
}
Here's my manifest file I have added all the permissions required:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.lalitahuja.iotbutton">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name="com.example.lalitahuja.iotbutton.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Here's the build Gradle file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.lalitahuja.iotbutton"
minSdkVersion 15
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-core:16.0.8'
implementation 'com.google.firebase:firebase-database:16.1.0'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.7'
implementation 'com.google.firebase:firebase-auth:16.2.0'
implementation 'com.firebase:firebase-client-android:2.5.2'
}
apply plugin: 'com.google.gms.google-services'
The error I'm getting:
E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 1
E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 2
E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 3
W/MessengerIpcClient: Received response for unknown request: 3
E/FirebaseInstanceId: Failed to resolve target intent service, skipping classname enforcement
E/FirebaseInstanceId: Error while delivering the message: ServiceIntent not found.
W/MessengerIpcClient: Received response for unknown request: 1
W/MessengerIpcClient: Received response for unknown request: 2

I/CrashlyticsCore: Crashlytics report upload complete but not show in dashboard

I have problem with Fabric. its a test project for find problem and do everything step by step in fabric documents, but i don't know what is mistake. please help me.
My Gradle:
buildscript {
repositories {
maven { url 'https://maven.fabric.io/public' }
}
dependencies {
classpath 'io.fabric.tools:gradle:1.+'
}
}
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'
repositories {
maven { url 'https://maven.fabric.io/public' }
}
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.mycompany.testtt"
minSdkVersion 17
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
compile('com.crashlytics.sdk.android:crashlytics:2.9.4#aar') {
transitive = true;
}
}
My Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mycompany.testtt">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="io.fabric.ApiKey"
android:value="9fd0b323bad2f5dae063288c94fd3a2317faa104"
/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
Main Activity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Fabric.with(this, new Crashlytics());
// TODO: Move this to where you establish a user session
logUser();
setContentView(R.layout.activity_main);
}
private void logUser() {
// TODO: Use the current user's information
// You can call any combination of these three methods
Crashlytics.setUserIdentifier("12345");
Crashlytics.setUserEmail("user#fabric.io");
Crashlytics.setUserName("Test User");
}
public void forceCrash(View view) {
throw new RuntimeException("This is a crash");
}
After all, and error and testing, but nothing is still displayed on the dashboard.
I do everything step by step from fabric documents.
I have this problem for a few days, and anyway I've tested it, but I still have not gotten a result and does not display anything in the fabric dashboard. ApiKey is correct and I'm sure of it.
(sorry for English)

Mopub Banner ads is not appearing

I am kind of newbie in Android Programming, So I Just want to Display Mopub banner ad in my app. I created the Sample app, also created Ad unit id in Mopub.
I successfully integrated SDK and following their https://developers.mopub.com/docs/android/banner/ instructions on this page.
but I don't know why my app which is Live on G-play Only sending the request but no impression. I also checked on my Phone & its true. No ads are displaying. Here is My Code
Can anyone Help me Please?
mainactivity.java:-
import com.mopub.mobileads.MoPubErrorCode;
import com.mopub.mobileads.MoPubView;
import static com.mopub.mobileads.MoPubView.BannerAdListener;
public class MainActivity extends AppCompatActivity implements BannerAdListener {
private MoPubView mBanner;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBanner = (MoPubView) findViewById(R.id.bannerview);
mBanner.setAdUnitId("XXXXXXXXXXXXXXXXXXXXXXXX"); // Enter your Ad Unit ID from www.mopub.com
mBanner.setBannerAdListener(this);
mBanner.loadAd();
}
#Override
protected void onDestroy() {
mBanner.destroy();
super.onDestroy();
}
#Override
public void onBannerLoaded(MoPubView banner) {
Log.d("MoPub Demo", "Banner loaded callback.");
}
#Override
public void onBannerFailed(MoPubView banner, MoPubErrorCode errorCode) {
Log.d("MoPub Demo", "Banner failed callback with: " + errorCode.toString());
}
#Override
public void onBannerClicked(MoPubView banner) {
Log.d("MoPub Demo", "Banner clicked callback.");
}
#Override
public void onBannerExpanded(MoPubView banner) {
Log.d("MoPub Demo", "Banner expanded callback.");
}
#Override
public void onBannerCollapsed(MoPubView banner) {
Log.d("MoPub Demo", "Banner collapsed callback.");
}
}
Activity_main.xml:-
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.mopub.mobileads.MoPubView
android:id="#+id/bannerview"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
/>
</RelativeLayout>
Build.gradle(module.app):-
repositories {
// ... other project repositories
jcenter() // includes the MoPub SDK and AVID library
maven { url "https://s3.amazonaws.com/moat-sdk-builds" }
}
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.your.prject.appmopubtest"
minSdkVersion 16
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.google.android.gms:play-services-ads:12.0.1'
implementation 'com.google.android.gms:play-services-auth:12.0.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation('com.mopub:mopub-sdk:4.20.0#aar') {
transitive = true
}
}
Build.gradle(project.appmopubtest):-
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
maven { url "https://s3.amazonaws.com/moat-sdk-builds" }
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
androidmanifest.xml:-
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.your.prject.appmopubtest">
<!-- Required permissions -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- Optional permissions. Will pass Lat/Lon values when available. Choose either Coarse or Fine -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- All ad formats -->
<activity android:name="com.mopub.common.MoPubBrowser" android:configChanges="keyboardHidden|orientation|screenSize"/>
<!-- Interstitials -->
<activity android:name="com.mopub.mobileads.MoPubActivity" android:configChanges="keyboardHidden|orientation|screenSize"/>
<activity android:name="com.mopub.mobileads.MraidActivity" android:configChanges="keyboardHidden|orientation|screenSize"/>
<!-- Rewarded Video and Rewarded Playables -->
<activity android:name="com.mopub.mobileads.RewardedMraidActivity" android:configChanges="keyboardHidden|orientation|screenSize"/>
<activity android:name="com.mopub.mobileads.MraidVideoPlayerActivity" android:configChanges="keyboardHidden|orientation|screenSize"/>
</application>
</manifest>

Adding Google Maps - Only seeing blank screen

I'm trying to add Google Maps. However, after building the apk from Build > Generate Signed apk and installing it to a real device, the activity only shows a blank screen, with the Google logo in the lower left. Is there something wrong with the following codes?
Notes
API Key is in both google_maps_api.xml and strings.xml, and API Key in below code is not shown
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.thesis.cutaneous.testapp1">
<permission
android:name="com.thesis.cutaneous.testapp1.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="com.thesis.cutaneous.testapp1.permission.MAPS_RECEIVE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MapsActivity"
android:label="#string/title_activity_maps">
<intent-filter>
<action android:name="com.thesis.cutaneous.testapp1.MapsActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="#string/google_maps_key" />
</application>
</manifest>
Gradle (Module)
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion '24.0.1'
defaultConfig {
applicationId "com.thesis.cutaneous.testapp1"
minSdkVersion 16
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.google.android.gms:play-services-maps:9.4.0'
}
Gradle (Project)
buildscript {
repositories {
maven { url 'http://repo1.maven.org/maven2' }
jcenter { url 'http://jcenter.bintray.com/' }
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.3'
}
}
allprojects {
repositories {
maven { url 'http://repo1.maven.org/maven2' }
jcenter { url 'http://jcenter.bintray.com/' }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
MainActivity.java
package com.thesis.cutaneous.testapp1;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private static Button btn1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.button);
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent("com.thesis.cutaneous.testapp1.MapsActivity"));
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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"
tools:context="com.thesis.cutaneous.testapp1.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="#+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_below="#+id/textView"
android:layout_centerHorizontal="true" />
</RelativeLayout>
MapsActivity.java
package com.thesis.cutaneous.testapp1;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng Angeles = new LatLng(15.1427956, 120.5977875);
mMap.addMarker(new MarkerOptions().position(Angeles).title("Marker in Angeles"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(Angeles));
}
}
activity_maps.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.thesis.cutaneous.testapp1.MapsActivity" />

Blank map is caused by incorrect google_maps_key. Note that there are 2 different keys - one for debug, one for release build. You have to register both on https://console.developers.google.com/. To determine your release key run something like this in your project directory:
"c:\Program Files\Java\jdk1.8.0_20\bin"\keytool -list -v -keystore keystore.jks