2
我試圖讓默認縮放控件顯示在谷歌mapView上。 我正在查看this的代碼。但getZoomControls()已棄用。mapView不推薦使用的方法getZoomControls?
我想使用setBuiltInZoomControls代替,但我得到錯誤;
當我調試時,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 <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
第18行是mapView.setBuiltInZoomControls(true);我的地圖顯示在一個選項卡中,我喜歡這個在我的主類(它處理選項卡 - 每個內容都是他們自己的類)。
Intent i = new Intent(this,MapTabView.class);
TabHost.TabSpec spec;
spec = getTabHost().newTabSpec("tab1");
spec.setContent(i);
spec.setIndicator("Map");
getTabHost().addTab(spec);
這裏是我的代碼:
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>
我剛剛意識到這是同樣的錯誤作爲一個我到達這裏:Android unable to start activity, error inflating class?。
這給了我18行NullPointerException異常,這是mapView.setBuiltInZoomControls(真) ; 我會用詳細信息編輯問題 – Ephemeros 2012-02-12 16:15:24
嘗試重新調整findViewById(R.layout.maptabview);在您的XML與findViewById(R.layout.mapview); (在XML中設置的實際ID) – znat 2012-02-12 16:30:43
'無法解析或不是字段'我認爲R.layout存儲了佈局文件引用(即主要和任何附加),而不是它們中的元素? – Ephemeros 2012-02-12 16:53:49