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Why i only got a Blank map with Google Maps Android API V2?

i'm trying to build a app with a Google Maps Api V2, but i only got a blank screen with zoom buttons everytime. I think everything is fine in my code. I have all the permissions necessary, i correctly got the Key. I already delete debug.keystore to eclipse generate another one, but i still got the same blank screen with zoom buttons. Can anyone see if i doing something wrong in my codes ?
My Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.meu"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="18" />
<permission
android:name="com.example.meu.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.meu.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<!-- Required OpenGL ES 2.0. for Maps V2 -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="****My key here***" />
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
My layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
My Java code:
package com.example.meu;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends Activity {
// Google Map
private GoogleMap googleMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
// Loading map
setContentView(R.layout.activity_main);
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* function to load map. If map is not created it will create it for you
* */
private void initilizeMap() {
if (googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),"Sorry! unable to create maps", Toast.LENGTH_SHORT).show();
}
}
}
#Override
protected void onResume() {
super.onResume();
initilizeMap();
}
I already read a lot of things here, but no one could help me.

Firstly: As your map is a fragment (MAPS API V.2) you should extend your MainActivity as a FragmentActivity
public class MainActivity extends FragmentActivity {
instead of
public class MainActivity extends Activity {
Secondly: When casting the fragment as a map use the SupportMapFragment class (for better cmpatability between android versions) and getSupportFragmentManager() to find your map fragment.
((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
instead of
((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
Also: as per the comments of the question "asker"(!?): If you find that your app is working in an Emulator but not on an actual device, ensure that you use your Debug.Keystore when building the App.
Note: Ensure at all times that you are using backwards compatible support libraries across your entire app (If you are targeting multiple versions of android of course but I can't understand why anyone would limit their app to only a couple of versions?) and also that all your keys, credentials, Auths etc.. are properly set up in the Google developers console. https://console.developers.google.com/

After do what Ryno Coetzee suggest me, the app work on emulator but not on device. But the app doesnt work on device because when i export to a apk file, i was using another keystore instead debug.keystore. After that, my app finally work on device and on emulator.
Thanks !

Blank screen when attempting load url within app

I am new to eclipse/Java. I searched for answer but nothing solved my problem. I hope someone can guide me. I am attempting to launch a webpage withing an android application however I am getting a blank page in the Android Virtual Emulation.
Here is my code
package com.example.t4;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.webkit.WebView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.loadUrl("http://www.google.com");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Here is the AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.t4"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.t4.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
and here is the activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<WebView
android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
I am not sure what I am doing wrong. The code runs without an error. I just get a blank screen. Any help is much appreciated. Thanks in advance.

try to put myWebView.getSettings().setJavaScriptEnabled(true); // enable javascript
myWebView.loadUrl("http://www.google.com");

Check out this working basic webview. I tested with "www.google.com" like yours and came up with a blank view. I used "http://www.google.com" and it ran fine. Try that out on yours? But feel free to steal the sample code too.

Restart your app (I mean click Run again) and make sure you have enabled javaScript as mentioned above.

"R cannot be resolved to a variable " even after new Eclipse install

I have the famous error message “R cannot be resolved to a variable” since the last 3 days and I’m totally stuck.
I did follow the instructions in the following links but I can’t remove this error:
Developing for Android in Eclipse: R.java not regenerating
I have crated plenty of new projects with just a new title but the same.
I even today uninstall completely Eclipse , jdk, jre and reinstall all but the same…
**Config: Windows 7 64 bits
eclipse-standard-kepler-SR1-win32-x86_64
jdk-7u51-windows-x64
jre-7u51-windows-x64
Android sdk downloaded**
I have noticed there is no file in the folder “gen” is always empty..
Thank you for your help
![enter image description here][1]
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Mainactivity.java:
package com.example.test1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
activity_maim xml
<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=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.test1.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

This looks like a 64bit issue, as android is looking for a 32bit ADT, there are a few options to solve this. Have a look at this question: Android SDK Setup under Windows 7 Pro 64 bit
I solved this under linux by doing sudo apt-get install ia32-libs

Have you checked your manifest.xml for mistakes?
I once had a small error in my manifest that didn't show up as an error and it wouldn't generate a new R file.
I noticed another small thing that might be the issue, in your main_activity.xml you use dimension strings for padding, when creating a new project these strings are located in res/values/dimens.xml but in your layout file you are referring to #dimen instead of #dimens (notice the missing 's').
Try changing it to "#dimens/..."

Failed to install Map.apk on device 'emulator-5554'

I'm new to the Android world, and I need to create an app using Google Maps Android API. I follow the instructions in:
https://developers.google.com/maps/documentation/android/start
and whenever I start the AVD I get an error:
[2013-12-05 21:04:37 - Map] Failed to install Map.apk on device 'emulator-5554!
[2013-12-05 21:04:37 - Map] (null)
[2013-12-05 21:04:38 - Map] Launch canceled!
My MainActivity code:
package com.example.map;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
my MainActivity XML file:
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"/>
and my Manifest.xml file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.map"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<!-- The following two permissions are not required to use
Google Maps Android API v2, but are recommended. -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="19" />
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.xxxxxxxxxHIDDENxxxxxxxx"
android:value="xxxxxxxxxHIDDENxxxxxxxx"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.map.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Also tried the code that it's provided here:
https://developers.google.com/maps/documentation/android/
being the MainActivity file code:
package com.example.map;
import com.google.android.gms.maps.*;
import com.google.android.gms.maps.model.*;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_activity);
// Get a handle to the Map Fragment
GoogleMap map = ((MapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
LatLng sydney = new LatLng(-33.867, 151.206);
map.setMyLocationEnabled(true);
map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));
map.addMarker(new MarkerOptions()
.title("Sydney")
.snippet("The most populous city in Australia.")
.position(sydney));
}
}
Any Ideas?

The first thing I would recommend is to not show your API key to the public; this are supposed to be private to whomever is developing the application.
Also the format of this meta tag is wrong:
<meta-data
android:name="com.google.android.maps.v2.AIzaSyB7AMKbYsVajgb6D0zpq9wUODX9gdR2DhE"
android:value="AIzaSyB7AMKbYsVajgb6D0zpq9wUODX9gdR2DhE"/>
You are copying your API key at the end of the name. I strongly suggest you create a new API key and do not use this one that you have exposed to the public. There might be other errors, but without the stack trace is hard to say.

See this page: http://developer.android.com/google/play-services/setup.html
Specifically:
To test your app when using the Google Play services SDK, you must use
either:
A compatible Android device that runs Android 2.3 or higher and includes Google Play Store.
The Android emulator with an AVD that runs the Google APIs platform based on Android 4.2.2 or higher.
So make sure the emulator you're using is Android 4.2.2 or greater. If it is below this level, Google Play Services is not available on the emulator, and you must use a physical android device to test it out.
If you have to test on a lower-end device emulator, there are workarounds to this but they aren't officially supported by Google so your mileage may vary.
See this link:
Custom emulator that supports Google Maps API

Displaying Images in Android using Java

I am splitting this off from my other thread here: Display image in popout window after button is clicked -- Android/Java
The old thread got very convoluted and confusing, and a bit off-topic, so I wanted to create another one that is clearer with more information.
I am trying to display an image in Android using an image file path that changes every time the app is run. I know there are ways to declare resources in the XML layout file, but since the picture I'd like to display is taken from the camera, I can't do it that way. I need to be able to display the image without hardcoding it.
The following is the code that I have:
photo_viewer.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pictureViewer"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/viewImage" />
</RelativeLayout>
Java method to display image:
public void viewPhoto(String file){
ImageView imageView = new ImageView(getApplicationContext());
LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
Bitmap image = BitmapFactory.decodeFile(file);
imageView.setImageBitmap(image);
RelativeLayout rl = (RelativeLayout)findViewById(R.id.pictureViewer);
rl.addView(imageView, lp);
}
However, when I run the above code the application crashes, saying it has stopped working. "file" is a string denoting the directory where the image from the camera is stored, and I know this part is correct. I can use it (using a different method) to change the wallpaper. It's just displaying it that is causing me trouble. I have tried various methods to simply display the image (dialogs, "drawable"s, bitmap factory, etc) and had the same problem with all of them. I feel like it's something simple that I have missed, since I'm new to Android app development. I'm hoping one of you folks might be able to shed some light on this.
EDIT:
I have decided to try another route, but I am still getting a null pointer exception. Here is all my code:
main class, viewPhoto method:
/* View photo */
public void viewPhoto(String file){
Intent imageView = new Intent(this, PhotoViewer.class);
imageView.putExtra("directory", file);
startActivity(imageView);
}
PhotoViewer class:
package com.androidproject;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class PhotoViewer extends Activity {
public String file;
ImageView image;
#Override
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.photo_viewer);
//get file path of image
Bundle extras = getIntent().getExtras();
file = extras.getString("directory");
Drawable drawable = Drawable.createFromPath(file);
image.setImageDrawable(drawable);
}
}
photo_viewer.xml (created using the Eclipse tool, so it's not just any xml file)
<?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:id="#+id/photo_viewer"
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=".PhotoViewer" >
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/viewImage"/>
</RelativeLayout>
Project manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidproject"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.SET_WALLPAPER" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".Main"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".PhotoViewer"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.androidproject.PhotoViewer" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
The app continues to crash and tell me "unfortunately it stopped working". Here's the logcat of the error:
As always, help is appreciated!

The null pointer exception is because
Drawable drawable = Drawable.createFromPath(file);
image.setImageDrawable(drawable);
is referencing an uninitiated variable (image) which is null
My best guess would be that to eliminate said error you'd want to initiate the variable
ImageView image = (ImageView)findViewById(R.id.imageView);