无法找到类com.google.android.gms.maps.SupportMapFragment

赋料扬雄敌，诗看子建亲。这篇文章主要讲述无法找到类com.google.android.gms.maps.SupportMapFragment相关的知识，希望能为你提供帮助。
所以我正在开发一款使用Google Maps v2 API来显示地图叠加层的应用。我知道之前已经问过这个问题，但我已经尝试了一切。我正在使用未植根且安装了Google Play服务的Nexus 5设备测试我的应用。
LogCat显示以下内容：

09-14 20:18:27.646: E/dalvikvm(10951): Could not find class 'com.google.android.gms.maps.SupportMapFragment', referenced from method com.bryansworld.algonquinreview.MainActivity.setUpMapInitial 09-14 20:18:27.686: E/AndroidRuntime(10951): FATAL EXCEPTION: main 09-14 20:18:27.686: E/AndroidRuntime(10951): Process: com.bryansworld.algonquinreview, PID: 10951 09-14 20:18:27.686: E/AndroidRuntime(10951): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bryansworld.algonquinreview/com.bryansworld.algonquinreview.MainActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread.access$800(ActivityThread.java:135) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.os.Handler.dispatchMessage(Handler.java:102) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.os.Looper.loop(Looper.java:136) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread.main(ActivityThread.java:5001) 09-14 20:18:27.686: E/AndroidRuntime(10951):at java.lang.reflect.Method.invokeNative(Native Method) 09-14 20:18:27.686: E/AndroidRuntime(10951):at java.lang.reflect.Method.invoke(Method.java:515) 09-14 20:18:27.686: E/AndroidRuntime(10951):at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 09-14 20:18:27.686: E/AndroidRuntime(10951):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 09-14 20:18:27.686: E/AndroidRuntime(10951):at dalvik.system.NativeStart.main(Native Method) 09-14 20:18:27.686: E/AndroidRuntime(10951): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 09-14 20:18:27.686: E/AndroidRuntime(10951):at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Activity.setContentView(Activity.java:1929) 09-14 20:18:27.686: E/AndroidRuntime(10951):at com.bryansworld.algonquinreview.MainActivity.onCreate(MainActivity.java:33) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Activity.performCreate(Activity.java:5231) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 09-14 20:18:27.686: E/AndroidRuntime(10951):... 11 more 09-14 20:18:27.686: E/AndroidRuntime(10951): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.SupportMapFragment: make sure class name exists, is public, and has an empty constructor that is public 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Fragment.instantiate(Fragment.java:597) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Fragment.instantiate(Fragment.java:561) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Activity.onCreateView(Activity.java:4778) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689) 09-14 20:18:27.686: E/AndroidRuntime(10951):... 21 more 09-14 20:18:27.686: E/AndroidRuntime(10951): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.maps.SupportMapFragment" on path: DexPathList[[zip file "/data/app/com.bryansworld.algonquinreview-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.bryansworld.algonquinreview-1, /vendor/lib, /system/lib]] 09-14 20:18:27.686: E/AndroidRuntime(10951):at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 09-14 20:18:27.686: E/AndroidRuntime(10951):at java.lang.ClassLoader.loadClass(ClassLoader.java:497) 09-14 20:18:27.686: E/AndroidRuntime(10951):at java.lang.ClassLoader.loadClass(ClassLoader.java:457) 09-14 20:18:27.686: E/AndroidRuntime(10951):at android.app.Fragment.instantiate(Fragment.java:583) 09-14 20:18:27.686: E/AndroidRuntime(10951):... 24 more

基本上，它说它找不到类com.google.android.gms.maps.SupportMapFragment。虽然我确信我在主项目中引用了Google Play服务。
【无法找到类com.google.android.gms.maps.SupportMapFragment】下图显示我在项目中引用了Google Play服务：
另外，这是我的ApplicationManifest.xml：

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.bryansworld.algonquinreview" android:versionCode="1" android:versionName="1.0" > < uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" /> < !-- Permissions for operation--> < permission android:name="com.bryansworld.algonquinreview.permission.MAPS_RECEIVE" android:protectionLevel="signature"/> < uses-permission android:name="com.bryansworld.algonquinreview.package.permission.MAPS_RECEIVE"/> < uses-permission android:name="android.permission.INTERNET" /> < 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" /> < !-- Required OpenGL ES 2.0. for Maps V2 --> < 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=".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> < !-- Google API Key --> < meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="https://www.songbingjia.com/android/KEY_GOES_HERE" /> < meta-data android:name="com.google.android.gms.version" android:value="https://www.songbingjia.com/android/@integer/google_play_services_version" /> < /application> < /manifest>

最后，这是我的MainActivity.java（到目前为止，它已经从Google API演示中复制）：

package com.bryansworld.algonquinreview; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.TileOverlay; import com.google.android.gms.maps.model.TileOverlayOptions; import com.google.android.gms.maps.model.TileProvider; import com.google.android.gms.maps.model.UrlTileProvider; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.CheckBox; import java.net.MalformedURLException; import java.net.URL; import java.util.Locale; public class MainActivity extends FragmentActivity { //The Algonquin Map URL private static final String ALGONQUIN_URL_FORMAT = "http://www.muscedere.ca/algonquin_map/%d/%d/%d.png"; //Map Elements private GoogleMap mMap; private TileOverlay mTiles; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setUpMapInitial(); }@Override protected void onResume() { super.onResume(); setUpMapInitial(); }private void setUpMapInitial(){ //Check to ensure map isn't already set up. if (mMap == null) { // Try to obtain the map from the SupportMapFragment. mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) .getMap(); //Now, we see if we are successful. if (mMap != null) { setUpMap(); } } }private void setUpMap() { mMap.setMapType(GoogleMap.MAP_TYPE_NONE); TileProvider tileProvider = new UrlTileProvider(256, 256) { @Override public synchronized URL getTileUrl(int x, int y, int zoom) { // The moon tile coordinate system is reversed.This is not normal. int reversedY = (1 < < zoom) - y - 1; String s = String.format(Locale.US, ALGONQUIN_URL_FORMAT, zoom, x, reversedY); URL url = null; try { url = new URL(s); } catch (MalformedURLException e) { throw new AssertionError(e); } return url; } }; mTiles = mMap.addTileOverlay(new TileOverlayOptions().tileProvider(tileProvider)); }public void setFadeIn(View v) { if (mTiles == null) { return; } mTiles.setFadeIn(((CheckBox) v).isChecked()); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }

如果有人有任何想法，那就太好了！现在很困惑。
答案

我没有看到你提到添加Android支持库android-support-v4.jar。您需要确保Eclipse正确包含它才能使com.google.android.gms.maps.SupportMapFragment工作：
另一个潜在问题是您的应用中的播放服务库与您的nexus 5设备上的播放服务版本不匹配。如果您从SDK管理器下载了最新的库，则其版本可能高于设备上的库。我猜你的设备上的播放服务版本是5.0.89，你可以查看设备Settings -> Apps -> Downloaded -> Google Play Services。如果是这种情况，请尝试使用旧版本的库。

另一答案你有没有尝试过这个建议：Unable instantiate android.gms.maps.MapFragment？