mapView устаревший метод getZoomControls?

Question

Я пытаюсь получить элементы управления увеличением по умолчанию для отображения на карте google. Я смотрел this код. Но getZoomControls() устарел.

Вместо этого я пытаюсь использовать setBuiltInZoomControls, но получаю ошибки;

Когда я отлаживаю исключение;

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.maptab2/com.test.maptab2.MapTabView}: java.lang.NullPointerException 


02-05 09:49:21.239: W/dalvikvm(357): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
02-05 09:49:22.616: E/AndroidRuntime(357): FATAL EXCEPTION: main 
02-05 09:49:22.616: E/AndroidRuntime(357): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: android.view.InflateException: Binary XML file line #24: Error inflating class <unknown> 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.os.Looper.loop(Looper.java:123) 
02-05 09:49:22.616: E/AndroidRuntime(357): at android.app.ActivityThread.main(ActivityThread.java:4627) 
02-05 09:49:22.616: E/AndroidRuntime(357): at java.lang.reflect.Method.invokeNative(Native Method) 
02-05 09:49:22.616: E/AndroidRuntime(357): at java.lang.reflect.Method.invoke(Method.java:521) 
02-05 09:49:22.616: E/AndroidRuntime(357): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
02-05 09:49:22.616: E/AndroidRuntime(357): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
02-05 09:49:22.616: E/AndroidRuntime(357): at dalvik.system.NativeStart.main(Native Method) 
02-05 09:49:22.616: E/AndroidRuntime(357): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.mapintab/com.test.mapintab.MapInTabActivit 

Строка 18 - mapView.setBuiltInZoomControls (true);

Моя карта отображается на вкладке, в которой я делаю это в своем основном классе (который касается вкладок - содержимое каждого из них является их собственными классами);

Intent i = new Intent(this,MapTabView.class); 

TabHost.TabSpec spec; 

spec = getTabHost().newTabSpec("tab1"); 
spec.setContent(i); 
spec.setIndicator("Map"); 
getTabHost().addTab(spec); 

Вот мой код:

MapTabView.java

package com.test.maptab2; 

import android.os.Bundle; 
import android.view.View; 
import android.widget.ZoomControls; 

import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 

public class MapTabView extends MapActivity { 

    MapView mapView; 

    @Override 
    public void onCreate (Bundle icicle){ 
     super.onCreate(icicle); 
     setContentView(R.layout.maptabview); 

     mapView = (MapView) findViewById(R.layout.maptabview); 
      mapView.setBuiltInZoomControls(true); 

    } 

    @Override 
    public boolean isRouteDisplayed(){ 
     return false; 
    } 

} 

maptabview.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/maptablayout" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 

    <!-- Actual map --> 
    <com.google.android.maps.MapView android:id="@+id/mapview" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:clickable="true" 
     android:apiKey="0HRMcD5o6WrBVhmwbWpeyeavZ67PXWOvJeeCx2g"/> 

</RelativeLayout> 

Я просто понял, что это та же ошибка, как один я прибытие сюда: Android unable to start activity, error inflating class?.

Answer 1

Этого должно быть достаточно для достижения желаемого.

mapView = (MapView) findViewById(R.id.historymapview); 
    mapView.setBuiltInZoomControls(true); 

Тогда вам не нужно явно размещать ZoomControls в XML, ни ссылаться на него в вашем Java коде