I Have Error a google map android api v2 is not loaded

Question

I have a project of google map android api v2 but i run this project in my phone a logcat has error

Falied to load map.Error contacting Google servers. This is probable an authentication issue(but could be due to network errors)

so my code is Here

in class HomeActivity

package com.mpa.emvi;

import com.mpa.emvi.R;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import android.os.Bundle;
//import android.app.Activity;
import android.view.Menu;

public class HomeActivity extends FragmentActivity {

    private GoogleMap mMap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        setUpMapIfNeeded();
    }

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

    private void setUpMapIfNeeded() {
        // Do a null check to confirm that we have not already instantiated the map.
        if (mMap == null) {
            // Try to obtain the map from the SupportMapFragment.
            mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                    .getMap();
            // Check if we were successful in obtaining the map.
            if (mMap != null) {
                setUpMap();
            }
        }
    }

    private void setUpMap() {
        mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.home, menu);
        return true;
    }

}

this is a Layout HomeActivity

<?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/send"
    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=".HomeActivity" >

    <fragment xmlns:map="http://schemas.android.com/apk/res-auto"
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"/>

    <Button
        android:id="@+id/sendDS"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/map"
        android:layout_centerHorizontal="true"
        android:text="@string/send_destination"/>

</RelativeLayout>

And this is a Manifest File

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mpa.emvi"
    android:versionCode="2"
    android:versionName="2.1.0">
    <permission
    android:name="com.mpa.emvi.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>
  <uses-permission android:name="com.mpa.emvi.permission.MAPS_RECEIVE"/>
  <!-- Copied from Google Maps Library/AndroidManifest.xml. -->
  <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="14"/>
  <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"/>
  <!-- External storage for caching. -->
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  <!-- My Location -->
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
  <!-- Maps API needs OpenGL ES 2.0. -->
  <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" >  
        <activity
            android:name="com.mpa.emvi.HomeActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data android:name="com.google.android.maps.v2.API_KEY"
        android:value="My-Release-API-KEY"/>
    </application>

</manifest>

You see my code. What do you thing? Ok I'm try to seach same issue in this and i try re-generate new api key but not work. In my project aleady import a google service lib and android support v4. In google console i open google map android api v2 service. In google console android apps: my-SHA1-serials;com.mpa.emvi

OK a lasting I'm a newbie android programmer and sorry for my english is poor.

Thank for every Answer.

Answer 1

您是否已在清单文件中添加了Api密钥？

Answer 2

好的，现在我的应用程序正在显示地图。我忘记了删除旧的apk文件并重新安装新的apk文件，谢谢。