所以我有两个片段并且正在使用视图寻呼机，因此我可以使用选项卡式滑动视图。选项卡和滑动工作正常，直到我开始添加地图。有什么建议可以帮助摆脱错误吗？
这是我的代码：
MainActivity：
package com.nathan.trackrun;
//Import Libraries
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
//Create main class
public class MainActivity extends FragmentActivity implements TabListener {
//Declare ViewPager and ActionBar variables
ViewPager viewPager;
ActionBar actionBar;
public static FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
//Initialise ViewPager
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
//Listen for changes in screen
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
actionBar.setSelectedNavigationItem(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
//Setup ActionBar (the bar that holds the Tabs on it)
actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//Create new tab called tabMap
ActionBar.Tab tabMap = actionBar.newTab();
//Set tab text to 'Map'
tabMap.setText("Map");
tabMap.setTabListener(this);
//Create new tab called tabStats
ActionBar.Tab tabStats = actionBar.newTab();
//Set tab text to 'Stats'
tabStats.setText("Stats");
tabStats.setTabListener(this);
//Add the new tabs to the ActionBar
actionBar.addTab(tabMap);
actionBar.addTab(tabStats);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
class MyAdapter extends FragmentPagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
Fragment fragment = null;
if(arg0==0){
fragment = new FragmentMap();
}
if(arg0==1){
fragment = new FragmentStats();
}
return fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 2;
}
}
地图片段：
package com.nathan.trackrun;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
/**
* A simple {@link android.support.v4.app.Fragment} subclass.
*
*/
public class FragmentMap extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
public FragmentMap() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_map, container,
false);
mMapView = (MapView) v.findViewById(R.id.location_map);
mMapView.onCreate(savedInstanceState);
mMapView.onResume();// needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
googleMap = mMapView.getMap();
// latitude and longitude
double latitude = 17.385044;
double longitude = 78.486671;
// create marker
MarkerOptions marker = new MarkerOptions().position(
new LatLng(latitude, longitude)).title("Hello Maps");
// Changing marker icon
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
// adding marker
googleMap.addMarker(marker);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(17.385044, 78.486671)).zoom(12).build();
googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
// Perform any camera updates here
return v;
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
}
主要活动XML：
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nathan.trackrun.MainActivity"
tools:ignore="MergeRootFrame" />
片段XML：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nathan.trackrun.FragmentMap"
android:background="#000000" >
<fragment
android:id="@+id/location_map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</FrameLayout>
logcat的：
11-15 06:39:46.894: D/dalvikvm(2459): GC_FOR_ALLOC freed 69K, 5% free 2904K/3028K, paused 1ms, total 3ms
11-15 06:39:46.894: I/dalvikvm-heap(2459): Grow heap (frag case) to 3.495MB for 635808-byte allocation
11-15 06:39:46.914: D/dalvikvm(2459): GC_FOR_ALLOC freed 2K, 4% free 3523K/3652K, paused 11ms, total 11ms
11-15 06:39:47.004: I/u(2459): Making Creator dynamically
11-15 06:39:47.004: I/Google Maps Android API(2459): Google Play services client version: 4452000
11-15 06:39:47.004: I/Google Maps Android API(2459): Google Play services package version: 4452036
11-15 06:39:47.044: D/dalvikvm(2459): GC_FOR_ALLOC freed 306K, 9% free 3731K/4092K, paused 23ms, total 23ms
11-15 06:39:47.074: I/fpp(2459): Making Creator dynamically
11-15 06:39:47.074: I/Google Maps Android API(2459): Google Play services client version: 4452000
11-15 06:39:47.094: D/dalvikvm(2459): GC_FOR_ALLOC freed 329K, 9% free 3916K/4300K, paused 12ms, total 13ms
11-15 06:39:47.104: D/dalvikvm(2459): GC_FOR_ALLOC freed 216K, 7% free 4140K/4412K, paused 2ms, total 2ms
11-15 06:39:47.104: I/dalvikvm-heap(2459): Grow heap (frag case) to 4.702MB for 635808-byte allocation
11-15 06:39:47.124: D/dalvikvm(2459): GC_FOR_ALLOC freed <1K, 6% free 4761K/5036K, paused 12ms, total 12ms
11-15 06:39:47.144: D/AndroidRuntime(2459): Shutting down VM
11-15 06:39:47.144: W/dalvikvm(2459): threadid=1: thread exiting with uncaught exception (group=0xb2d18b20)
11-15 06:39:47.144: E/AndroidRuntime(2459): FATAL EXCEPTION: main
11-15 06:39:47.144: E/AndroidRuntime(2459): Process: com.nathan.trackrun, PID: 2459
11-15 06:39:47.144: E/AndroidRuntime(2459): java.lang.ClassCastException: android.support.v4.app.NoSaveStateFrameLayout cannot be cast to com.google.android.gms.maps.MapView
11-15 06:39:47.144: E/AndroidRuntime(2459): at com.nathan.trackrun.FragmentMap.onCreateView(FragmentMap.java:38)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:478)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.View.measure(View.java:16497)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.View.measure(View.java:16497)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
11-15 06:39:47.144: E/AndroidRuntime(2459): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.View.measure(View.java:16497)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
11-15 06:39:47.144: E/AndroidRuntime(2459): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.View.measure(View.java:16497)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.Choreographer.doFrame(Choreographer.java:544)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.os.Handler.handleCallback(Handler.java:733)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.os.Handler.dispatchMessage(Handler.java:95)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.os.Looper.loop(Looper.java:136)
11-15 06:39:47.144: E/AndroidRuntime(2459): at android.app.ActivityThread.main(ActivityThread.java:5017)
11-15 06:39:47.144: E/AndroidRuntime(2459): at java.lang.reflect.Method.invokeNative(Native Method)
11-15 06:39:47.144: E/AndroidRuntime(2459): at java.lang.reflect.Method.invoke(Method.java:515)
11-15 06:39:47.144: E/AndroidRuntime(2459): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
11-15 06:39:47.144: E/AndroidRuntime(2459): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
11-15 06:39:47.144: E/AndroidRuntime(2459): at dalvik.system.NativeStart.main(Native Method)
11-15 06:39:51.164: I/Process(2459): Sending signal. PID: 2459 SIG: 9
答案 0 :(得分：0)
您的代码似乎是从this answer复制的。
但是你跳过了这一部分：
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.gms.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
这样做了：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nathan.trackrun.FragmentMap"
android:background="#000000" >
<fragment
android:id="@+id/location_map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</FrameLayout>
使用MapView代替片段。