[android-beginners] Map view problem - blank screen

[Felipe Arturo]

Hello, I'm new here, I have a problem implementing a Map view element
on my application.
The app loads but the screen remain blank and nothing comes up.

Im developing on a real device, I got a G1

I have already got my own keystore and implemented all the permissions
seen
on the tutorial that I'm following:

http://mobiforge.com/developing/story/using-google-maps-android

my code is this:

this is my activity

package net.learn2develop.GoogleMaps;

import android.app.Activity;
import android.content.Intent;

import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MapsActivity extends MapActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0,-1, 0, R.string.close);
        menu.add(0,1,1,R.string.acercade);

        return true;
    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        switch(item.getItemId()) {

        case -1:
                finish();
                return true;
        case 1:
                about();
                return true;
        }

        return super.onMenuItemSelected(featureId, item);
    }

    private void about() {

        Intent i = new Intent(this, Acerca.class);
        startActivity(i);

    }

}


this one is my manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
      package="net.learn2develop.GoogleMaps"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/
app_name">
      <uses-library android:name="com.google.android.maps" />
                 <activity android:name=".MapsActivity"
                  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="Acerca"></activity>
</application>
         <uses-permission android:name="android.permission.INTERNET" />
         <uses-permission
android:name="android.permission.ACCESS_FINE_LOCATION"></uses-
permission>

</manifest>



and this one is my main file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
      <com.google.android.maps.MapView
        android:id="@+id/mapView"
        android:enabled="true"
        android:clickable="true"
        android:apiKey="here_goes_my_keystore_got_from_google"
        android:layout_width="fill_parent"
android:layout_height="fill_parent"/>


</LinearLayout>

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