java.lang.ClassCastException:fragment cannot be cast to android.support.v4.app.Fragment
Solution 1
Changing the import from android.app.Fragment
to android.support.v4.app.Fragment
helped me solve this. Thanks!
Solution 2
Change your import import android.app.Fragment;
to import android.support.v4.app.Fragment;
into TruckStatus
Solution 3
import android.support.v4.app.Fragment;
Before you do this Right click project->properties->buildpath->java build path -> libraries .. then click on add external jars
the go to
user\android-sdks\extras\android\support\v4
and select android-support-v4.jar
Jishin
Updated on May 29, 2020Comments
-
Jishin almost 4 years
I am trying to implement Tab Navigation, I have a Container Activity that extends Fragment Activity, and this Activity creates a TabView using an ActionBar. The app will try to create three tabs and add them to the ActionBar, and I want to change the fragment depending on the TabSelection..But occured an error
07-04 12:17:33.534: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: com.freight.fragments.TruckStatus cannot be cast to android.support.v4.app.Fragment
.TruckActivity.java
package com.freight.activities; import java.util.Locale; import com.clacion.freightexchange.R; import com.clacion.freightexchange.R.drawable; import com.clacion.freightexchange.R.id; import com.clacion.freightexchange.R.layout; import com.clacion.freightexchange.R.menu; import com.clacion.freightexchange.R.string; import com.freight.fragments.TruckStatus; import android.app.ActionBar; import android.app.FragmentTransaction; import android.os.Bundle; 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.app.NavUtils; import android.support.v4.view.ViewPager; import android.view.Gravity; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class TruckActivity extends FragmentActivity implements ActionBar.TabListener { /** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link android.support.v4.app.FragmentStatePagerAdapter}. */ SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_truck); // Set up the action bar. final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // Create the adapter that will return a fragment for each of the three // primary sections of the app. mSectionsPagerAdapter = new SectionsPagerAdapter( getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); // When swiping between different sections, select the corresponding // tab. We can also use ActionBar.Tab#select() to do this if we have // a reference to the Tab. mViewPager .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { // Create a tab with text corresponding to the page title defined by // the adapter. Also specify this Activity object, which implements // the TabListener interface, as the callback (listener) for when // this tab is selected. actionBar.addTab(actionBar.newTab() .setText(mSectionsPagerAdapter.getPageTitle(i)) .setIcon(R.drawable.item_menu_config) .setTabListener(this)); } actionBar.setSelectedNavigationItem(0); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.truck, menu); return true; } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a DummySectionFragment (defined as a static inner class // below) with the page number as its lone argument. Fragment fragment = new DummySectionFragment(); Bundle args = new Bundle(); args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1); fragment.setArguments(args); return fragment; } @Override public int getCount() { // Show 3 total pages. return 3; } @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return getString(R.string.title_menu_truck1).toUpperCase(l); case 1: return getString(R.string.title_menu_truck2).toUpperCase(l); case 2: return getString(R.string.title_menu_truck3).toUpperCase(l); } return null; } } /** * A dummy fragment representing a section of the app, but that simply * displays dummy text. */ public static class DummySectionFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ public static final String ARG_SECTION_NUMBER = "section_number"; public DummySectionFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_truck_dummy, container, false); // TextView dummyTextView = (TextView) rootView // .findViewById(R.id.section_label); // dummyTextView.setText(Integer.toString(getArguments().getInt( // ARG_SECTION_NUMBER))); int pos=getArguments().getInt(ARG_SECTION_NUMBER); if(pos==1){ // dummyTextView.setText("Selected Truck"); }else if(pos==2){ // dummyTextView.setText("Selected Tripsheet"); }else if(pos==3){ // dummyTextView.setText("Selected Alerts"); } return rootView; } } }
fragment_truck_dummy.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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:background="#000" tools:context=".TruckActivity$DummySectionFragment" > <!-- <TextView android:id="@+id/section_label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFF" /> --> <fragment android:id="@+id/sub_frag" android:layout_width="match_parent" android:layout_height="match_parent" class="com.freight.fragments.TruckStatus" /> </RelativeLayout>
TruckStatus.java
package com.freight.fragments; import com.clacion.freightexchange.R; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class TruckStatus extends Fragment { @Override public void onActivityCreated(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onActivityCreated(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View v =inflater.inflate(R.layout.truck_status_fragment, container, false); return v; } }
My LogCat
07-04 12:17:33.534: E/AndroidRuntime(795): FATAL EXCEPTION: main 07-04 12:17:33.534: E/AndroidRuntime(795): android.view.InflateException: Binary XML file line #17: Error inflating class fragment 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 07-04 12:17:33.534: E/AndroidRuntime(795): at com.freight.activities.TruckActivity$DummySectionFragment.onCreateView(TruckActivity.java:177) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.view.ViewPager.populate(ViewPager.java:1064) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.view.ViewPager.populate(ViewPager.java:911) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.View.measure(View.java:15518) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.View.measure(View.java:15518) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.View.measure(View.java:15518) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-04 12:17:33.534: E/AndroidRuntime(795): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.View.measure(View.java:15518) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.Choreographer.doFrame(Choreographer.java:532) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.os.Handler.handleCallback(Handler.java:725) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.os.Handler.dispatchMessage(Handler.java:92) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.os.Looper.loop(Looper.java:137) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.app.ActivityThread.main(ActivityThread.java:5041) 07-04 12:17:33.534: E/AndroidRuntime(795): at java.lang.reflect.Method.invokeNative(Native Method) 07-04 12:17:33.534: E/AndroidRuntime(795): at java.lang.reflect.Method.invoke(Method.java:511) 07-04 12:17:33.534: E/AndroidRuntime(795): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 07-04 12:17:33.534: E/AndroidRuntime(795): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 07-04 12:17:33.534: E/AndroidRuntime(795): at dalvik.system.NativeStart.main(Native Method) 07-04 12:17:33.534: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: com.freight.fragments.TruckStatus cannot be cast to android.support.v4.app.Fragment 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.Fragment.instantiate(Fragment.java:394) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.Fragment.instantiate(Fragment.java:369) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272) 07-04 12:17:33.534: E/AndroidRuntime(795): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676) 07-04 12:17:33.534: E/AndroidRuntime(795): ... 43 more
Am using Android 4.2.2 APIs 17..Does anybody have any idea about it?