Question

我是Android和Google Maps v2 API的新手。我试图在我的应用程序中集成API，但我得到了：

不幸的是，地图示例已停止。

任何人都可以帮我找错吗？

MainActivity类：

import android.app.Activity;

import android.os.Bundle;
import android.widget.Toast;

import com.google.android.gms.maps.GoogleMap;
 import com.google.android.gms.maps.MapFragment;

  public class MainActivity extends Activity {

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

    GoogleMap map;
    map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
            .getMap();

    if (map == null)
        Toast.makeText(getApplicationContext(),
                "Sorry! unable to create Map.", Toast.LENGTH_SHORT).show();
    else {
        // do somework here.

    }

    }

    }

activity_main.xml中

<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" >

<!-- Google Maps API V2 -->

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

</RelativeLayout>

Androidmainfest.xml

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



 <uses-permission android:name="com.example.mapexample.permission.MAPS_RECEIVE" />
<uses-permission                                   android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<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="11"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
    </activity>
    <activity
        android:name=".Sample"
        android:label="@string/title_activity_sample" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <!-- <uses-library android:name="com.google.android.maps"/> -->
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="6587000" />

    <!-- API KEY -->
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="API-KEY-HERE" />
</application>

我的logcat输出

 06-10 21:03:06.610: E/dalvikvm(857): Could not find class 'com.google.android.gms.maps.MapFragment', referenced from method com.example.mapexample.MainActivity.onCreate
06-10 21:03:06.610: W/dalvikvm(857): VFY: unable to resolve check-cast 1271 (Lcom/google/android/gms/maps/MapFragment;) in Lcom/example/mapexample/MainActivity;
06-10 21:03:06.610: D/dalvikvm(857): VFY: replacing opcode 0x1f at 0x0014
06-10 21:03:06.670: D/AndroidRuntime(857): Shutting down VM
06-10 21:03:06.670: W/dalvikvm(857): threadid=1: thread exiting with uncaught exception (group=0xb1ae6d70)
06-10 21:03:06.880: E/AndroidRuntime(857): FATAL EXCEPTION: main
06-10 21:03:06.880: E/AndroidRuntime(857): Process: com.example.mapexample, PID: 857
06-10 21:03:06.880: E/AndroidRuntime(857): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mapexample/com.example.mapexample.MainActivity}: android.view.InflateException: Binary XML file line #13: Error inflating class fragment
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread.access$800(ActivityThread.java:138)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.os.Handler.dispatchMessage(Handler.java:102)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.os.Looper.loop(Looper.java:136)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread.main(ActivityThread.java:5026)
06-10 21:03:06.880: E/AndroidRuntime(857):  at java.lang.reflect.Method.invokeNative(Native Method)
06-10 21:03:06.880: E/AndroidRuntime(857):  at java.lang.reflect.Method.invoke(Method.java:515)
06-10 21:03:06.880: E/AndroidRuntime(857):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
06-10 21:03:06.880: E/AndroidRuntime(857):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
06-10 21:03:06.880: E/AndroidRuntime(857):  at dalvik.system.NativeStart.main(Native Method)
06-10 21:03:06.880: E/AndroidRuntime(857): Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class fragment
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
06-10 21:03:06.880: E/AndroidRuntime(857):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:309)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Activity.setContentView(Activity.java:1930)
06-10 21:03:06.880: E/AndroidRuntime(857):  at com.example.mapexample.MainActivity.onCreate(MainActivity.java:15)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Activity.performCreate(Activity.java:5242)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
06-10 21:03:06.880: E/AndroidRuntime(857):  ... 11 more
06-10 21:03:06.880: E/AndroidRuntime(857): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Fragment.instantiate(Fragment.java:597)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Fragment.instantiate(Fragment.java:561)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Activity.onCreateView(Activity.java:4788)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
06-10 21:03:06.880: E/AndroidRuntime(857):  ... 21 more
06-10 21:03:06.880: E/AndroidRuntime(857): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.maps.MapFragment" on path: DexPathList[[zip file "/data/app/com.example.mapexample-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.mapexample-1, /system/lib]]
06-10 21:03:06.880: E/AndroidRuntime(857):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
06-10 21:03:06.880: E/AndroidRuntime(857):  at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
06-10 21:03:06.880: E/AndroidRuntime(857):  at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
06-10 21:03:06.880: E/AndroidRuntime(857):  at android.app.Fragment.instantiate(Fragment.java:583)
06-10 21:03:06.880: E/AndroidRuntime(857):  ... 24 more

Answer 1

ClassNotFoundException，所以大多数时候你都错过了添加库依赖项。在将Google Play服务用于您的项目之前，需要先设置它们。通过以下链接查找详细信息：

https://developers.google.com/android/guides/setup

根据此处的官方文档https://developers.google.com/maps/documentation/android/start，所需的最低sdk版本为12.请尝试将minSdkVersion值增加到12。

Answer 2

您的代码似乎很好。您可以尝试这种方式，这在官方文档中提到，

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

    setUpMapIfNeeded()

}

private void setUpMapIfNeeded() {
    MapFragment mapFragment = (MapFragment) getFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(MainActivity.this);
}

@Override
    public void onMapReady(final GoogleMap googleMap) {

        // map has been loaded
    }

确保您的类实现 OnMapReadyCallback

Android谷歌地图v2停止

2 个答案: