我有这个(见下文)活动,其中有带有选项卡的操作栏。每个选项卡都是一个片段。片段之一是通过Google Map v2片段膨胀的。
问题是我无法从膨胀的View中获取GoogleMap对象。
活动:
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.Toast;
import com.events.fragments.FragmentTab1;
import com.events.fragments.MapsFragment;
import com.events.fragments.FragmentTab3;
import com.events.activities.R;
public class MasterActivity extends FragmentActivity
{
// Declare Tab Variable
ActionBar.Tab Tab1, Tab2, Tab3;
Fragment fragmentTab1 = new FragmentTab1();
Fragment fragmentTab2 = new MapsFragment();
Fragment fragmentTab3 = new FragmentTab3();
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_master);
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create Actionbar Tabs
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set Tab Icon and Titles
Tab1 = actionBar.newTab().setText("tab1");
Tab2 = actionBar.newTab().setText("Tab2");
Tab3 = actionBar.newTab().setText("Tab3");
// Set Tab Listeners
Tab1.setTabListener(new TabListener(fragmentTab1));
Tab2.setTabListener(new TabListener(fragmentTab2));
Tab3.setTabListener(new TabListener(fragmentTab3));
// Add tabs to actionbar
actionBar.addTab(Tab1);
actionBar.addTab(Tab2);
actionBar.addTab(Tab3);
}
public class TabListener implements ActionBar.TabListener {
Fragment fragment;
public TabListener(Fragment fragment) {
// TODO Auto-generated constructor stub
this.fragment = fragment;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.replace(R.id.fragment_container, fragment);
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.remove(fragment);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
}
分段:
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Fragment;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AutoCompleteTextView;
import android.widget.Toast;
import com.events.activities.R;
import com.events.objects.PlaceAutosuggest;
import com.events.objects.PlaceObj;
import com.events.si.PlacesService;
import com.events.views.PlacesAutoSuggAdapter;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class MapsFragment extends Fragment
{
View rootView;
GoogleMap map;
AutoCompleteTextView addressInput;
ProgressDialog progressDialog;
FindMapLocationTask findMapLocationTask;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
if (rootView != null)
{
ViewGroup parent = (ViewGroup) rootView.getParent();
if (parent != null)
parent.removeView(rootView);
}
try
{
rootView = inflater.inflate(R.layout.map_frag, container, false);
}
catch (InflateException e)
{
return rootView;
}
addressInput = (AutoCompleteTextView) rootView.findViewById(R.id.map_frag_location_AutoCompleteTextView);
map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map_frag_map_fragment)).getMap();
addressInput.setAdapter(new PlacesAutoSuggAdapter(getActivity()));
addressInput.setOnItemClickListener( new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id)
{
PlaceAutosuggest place = (PlaceAutosuggest) adapterView.getItemAtPosition(position);
addressInput.setText(place.getName());
findMapLocationTask = new FindMapLocationTask();
findMapLocationTask.execute(place.getReferance());
//Toast.makeText(getActivity(), place.getReferance(), Toast.LENGTH_LONG).show();
}
});
return rootView;
}
@Override
public void onResume()
{
super.onResume();
}
}
map_frag布局的xml:
<RelativeLayout 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" >
<AutoCompleteTextView
android:id="@+id/map_frag_location_AutoCompleteTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ems="10" >
<requestFocus />
</AutoCompleteTextView>
<fragment
android:id="@+id/map_frag_map_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/map_frag_location_AutoCompleteTextView"
android:layout_alignParentLeft="true"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
现在在
MapFragment
(map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map_frag_map_fragment)).getMap();
)的片段Cannot cast from Fragment to SupportMapFragment
中。现在,我尝试将其更改为:android.app.Fragment;
到android.app.support.v4.Fragment;
,但它在MasterActivity中引起了错误。我该如何解决呢??? 最佳答案
您的主要问题是要混合来自不同库的不同类型的片段。
如果使用的是SupportMapFragment
,则不能使用android.app.Fragment
,而需要使用android.app.support.v4.Fragment
,因此无法解决此问题。如果在更改使用支持片段时遇到错误,则只需修复它们,这可能还与您混合类有关。
下一个问题是MapsFragment
必须是MapFragment
或SupportMapFragment
,而不能只是Fragment
如果您使用的是本机片段,则无需使用FragmentActivity
,而可以只使用常规的Activity
,然后使用MapFragment
总结一下,一旦您使用了一个库中的某些内容,就需要坚持使用该库,并且不能将本机片段与支持片段混合使用