我试图通过Google Map API V2在我的应用上获得一个简单的地图;我按照所有步骤进行操作,但是当我启动应用程序时,我只会在左下角显示带有Google徽标的白页。
如果有人可以帮助我,那就太棒了..
这是XML文件:
<fragment 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:id="@+id/map" tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
这是文件Java:
package com.example.ismail.location_test;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
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 {
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
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"));
}
}
最后是Manifest:
<?xml version="1.0" encoding="utf-8"?>
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="21" />
<uses-permission android:name="com.example.ismail.location_test.permission.MAPS_RECEIVE"/>
<permission android:name="com.example.ismail.location_test.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<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" />
<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"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<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.API_KEY"
android:value="AIzaSyBbHBnsC_YhHKQhhsnaahYiT3GltK52It0" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
答案 0 :(得分:0)
我没有发现您的代码有任何问题。您描述的症状指向无效的API密钥或gps已关闭,或者即使您正在运行这是一个未安装Google Play的模拟器。检查build.gradle下安装和使用的google play版本。例如:
dependencies {
compile 'com.google.android.gms:play-services:6.5.87'
我建议您发布您的debuger日志,如果是api错误,它会在那里说明。
答案 1 :(得分:0)
我怀疑代码中有3个错误:
(1)在使用前声明许可:
<permission android:name="com.example.ismail.location_test.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<!-- after declare use this -->
<uses-permission android:name="com.example.ismail.location_test.permission.MAPS_RECEIVE"/>
(2)缺少Declare gms版本变量:
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
(3)缺少声明API_KEY:
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaS33yBBDxSDFsdf33BK-7HCasdfSADFfa72wJnKLZvq6A" />
首先请检查以上3位嫌疑人:如果仍有错误,您可以重新确认从here启用Google地图的步骤