mapView不推荐使用方法getZoomControls？
我正在尝试将默认缩放控件显示在google mapView上。 我在看这段代码。 但是不推荐使用getZoomControls（）。
我正在尝试使用setBuiltInZoomControls，但是我遇到了错误;
当我调试时，例外是;
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 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 第18行是mapView.setBuiltInZoomControls（true）;
我的地图显示在一个标签中，我在我的主要课程中这样做（它处理标签 – 每个都是他们自己的课程的内容）;
Intent i = new Intent(this,MapTabView.class); TabHost.TabSpec spec; spec = getTabHost().newTabSpec("tab1"); spec.setContent(i); spec.setIndicator("Map"); getTabHost().addTab(spec);
这是我的代码：
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
我刚刚意识到这和我在这里遇到的错误相同： Android无法启动活动，错误膨胀类？ 。
这应该足以实现你想要的。
mapView = (MapView) findViewById(R.id.historymapview); mapView.setBuiltInZoomControls(true);
然后，您不需要将ZoomControls显式放在XML中，也不需要在Java代码中引用它