Android - 錯誤膨脹類的片段 - XML文件

Question

我收到一個錯誤，我的SupportFragment代碼。它有膨脹XML的問題。它在活動開始時崩潰。下面是我使用的Java代碼：

@Override 
protected void onCreate(Bundle load) 
{ 
    super.onCreate(load); 

    setContentView(R.layout.map); 
    mMapView = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.myMapView)).getMap(); 

    mMapscreen = findViewById(R.id.mapScreen); 
    mMapscreen.setDrawingCacheEnabled(true); 
    mUnits = new UnitsI18n(this); 
    mLoggerServiceManager = new GPSLoggerServiceManager(this); 

    final Semaphore calulatorSemaphore = new Semaphore(0); 
    Thread calulator = new Thread("OverlayCalculator") 
    { 
     @Override 
     public void run() 
     { 
      Looper.prepare(); 
      mHandler = new Handler(); 
      calulatorSemaphore.release(); 
      Looper.loop(); 
     } 
    }; 
    calulator.start(); 
    try 
    { 
    calulatorSemaphore.acquire(); 
    } 
    catch (InterruptedException e) 
    { 
    Log.e(TAG, "Failed waiting for a semaphore", e); 
    } 
    mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); 

    TextView[] speeds = { (TextView) findViewById(R.id.speedview05), (TextView) findViewById(R.id.speedview04), (TextView) findViewById(R.id.speedview03), (TextView) findViewById(R.id.speedview02), 
     (TextView) findViewById(R.id.speedview01), (TextView) findViewById(R.id.speedview00) }; 
    mSpeedtexts = speeds; 
    mLastGPSSpeedView = (TextView) findViewById(R.id.currentSpeed); 
    mLastGPSAltitudeView = (TextView) findViewById(R.id.currentAltitude); 
    mDistanceView = (TextView) findViewById(R.id.currentDistance); 

    createListeners(); 
    onRestoreInstanceState(load); 
} 

這裏是XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:id="@+id/mapScreen"> 
<fragment 
    android:id="@+id/myMapView" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    class="com.google.android.gms.maps.SupportMapFragment"/> 

這裏是logcat的輸出：

05-22 10:35:35.081: E/AndroidRuntime(3483): FATAL EXCEPTION: main 
05-22 10:35:35.081: E/AndroidRuntime(3483): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.gpstracker/com.android.epicriders.Rides.RideTracking3}: android.view.InflateException: Binary XML file line #12: Error inflating class fragment 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.os.Looper.loop(Looper.java:137) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at dalvik.system.NativeStart.main(Native Method) 
05-22 10:35:35.081: E/AndroidRuntime(3483): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class fragment 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:746) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.Activity.setContentView(Activity.java:1881) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at com.polaris.epicriders.Rides.RideTracking3.onCreate(RideTracking3.java:152) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.Activity.performCreate(Activity.java:5104) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  ... 11 more 
05-22 10:35:35.081: E/AndroidRuntime(3483): Caused by: android.support.v4.app.Fragment$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 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.support.v4.app.Fragment.instantiate(Fragment.java:401) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.support.v4.app.Fragment.instantiate(Fragment.java:369) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  ... 21 more 
05-22 10:35:35.081: E/AndroidRuntime(3483): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.maps.MapFragment" on path: /data/app/com.android.gpstracker-1.apk 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  at android.support.v4.app.Fragment.instantiate(Fragment.java:391) 
05-22 10:35:35.081: E/AndroidRuntime(3483):  ... 24 more 

我使用了錯誤的SupportMapFragment或沒有正確地膨脹它？任何幫助，將不勝感激！

Answer 1

確保您使用的是下面的import語句：

import com.google.android.gms.maps.SupportMapFragment; 

，而不是：

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

然後做100％，在佈局文件的類名是：

com.google.android.gms.maps.SupportMapFragment 

從你的logcat消息看，inflater正在試圖給一個MapFragment充氣，而不是一個SupportMapFragment。