Question

我正在使用android google map api v2创建原生地图我只是从链接http://www.androidhive.info/2013/08/android-working-with-google-maps-v2/显示程序到目前为止，我尝试了一些错误已经解决，但仍然没有渲染地图，它显示以下错误 enter image description here

这里是整个代码跟踪.........................................

.........................................androidmanifest.xml..............................
<?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" >

    <permission
        android:name="com.example.map.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" >
    </permission>

    <uses-permission android:name="com.example.map.permission.MAPS_RECEIVE" />

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <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-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.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>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyAmFQLVogHnMayejnRjtwqfJ7rFckQ4KJ0" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
    </application>

</manifest>
............................mainactivity.java................................
package com.example.map;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends FragmentActivity {
    private GoogleMap googleMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initializeMap();

        googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        googleMap.setMyLocationEnabled(true);
        googleMap.getUiSettings().setZoomControlsEnabled(true);
        googleMap.getUiSettings().setMyLocationButtonEnabled(true);
        googleMap.getUiSettings().setCompassEnabled(true);
        googleMap.getUiSettings().setRotateGesturesEnabled(true);
        googleMap.getUiSettings().setZoomControlsEnabled(true);
        googleMap.getUiSettings().setZoomGesturesEnabled(true);

        double latitude = 17.385044;
        double longitude = 78.486671;

        for(int i=0;i<10;i++){
            double[] randomLocation=createRandLocation(latitude,
                    longitude);

            MarkerOptions markerOptions=new MarkerOptions().position(new LatLng(randomLocation[0], randomLocation[1])).title("hello bam bam"+i);
            Log.e("Random", "> " + randomLocation[0] + ", "
                    + randomLocation[1]);

            // changing marker color
            if (i == 0)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
            if (i == 1)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
            if (i == 2)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_CYAN));
            if (i == 3)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
            if (i == 4)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
            if (i == 5)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
            if (i == 6)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_RED));
            if (i == 7)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
            if (i == 8)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_VIOLET));
            if (i == 9)
                markerOptions.icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_YELLOW));

            googleMap.addMarker(markerOptions);

            // Move the camera to last position with a zoom level
            if (i == 9) {
                CameraPosition cameraPosition = new CameraPosition.Builder()
                        .target(new LatLng(randomLocation[0],
                                randomLocation[1])).zoom(15).build();
                googleMap.animateCamera(CameraUpdateFactory
                        .newCameraPosition(cameraPosition));
        }

        }
    }
    @Override
    protected void onResume(){
        super.onResume();
        initializeMap();
    }
    private void initializeMap(){
        if (googleMap==null){
            googleMap=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();

            if(googleMap==null){
                Toast.makeText(getApplicationContext(), "brother map is not renedering please do somethingh",Toast.LENGTH_SHORT).show();
            }
        }
    }
    private double[] createRandLocation(double latitude, double longitude) {

        return new double[] { latitude + ((Math.random() - 0.5) / 500),
                longitude + ((Math.random() - 0.5) / 500),
                150 + ((Math.random() - 0.5) * 10) };
    }



}
...................................activity_main.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" >

    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.google.android.gms.maps.MapFragment" 
        />

</RelativeLayout>

我使用目标4.2.2谷歌api构建这个以及如何在Android模拟器上显示谷歌地图我正在使用ADT开发应用程序已经导入了谷歌播放服务库和所有必要的jar 任何人请告诉我我被困在哪里为什么地图没有在模拟器上显示我是android的新手

提前谢谢你......

enter image description here

Answer 1

我认为您需要从主类活动扩展您的活动，而对于MapFragment，您需要导入com.google.android.gms.maps.MapFragment。

这可能对你有帮助。

Answer 2

只有以下代码足以打开地图： - 现在，您可以使用地图对象为相机设置动画并使用标记。

<fragment android:id="@+id/map"
          android:name="com.google.android.gms.maps.SupportMapFragment"
          android:layout_width="match_parent"
          android:layout_height="match_parent" />

======================== Java文件=================

GoogleMap map = ((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map)).getMap();


  Hope,this will solve your problem .

地图应用程序无意中得到了关闭显示引起：java.lang.NullPointerException

2 个答案: