Incident of capping Up (setDisplayHomeAsUpEnabled) in fragment

[morde]

The fragment code:

public class sovety_Fragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_sovety, null);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        // 28 строка
        getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
    }

    return v;
}

}

Erroneous transition:

01-06 18:43:31.668 9656-9656/com.whitestar.topcar E/AndroidRuntime: FATAL EXCEPTION: main

java.lang.NullPointerException

at com.whitestar.topcar.sovety_Fragment.onCreateView(sovety_Fragment.java:28)

at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)

at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)

at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)

at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)

at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)

at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)

at android.os.Handler.handleCallback(Handler.java:615)

at android.os.Handler.dispatchMessage(Handler.java:92)

at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:4745)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

at dalvik.system.NativeStart.main(Native Method)

activate code:

package com.whitestar.topcar;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v7.app.ActionBarActivity;

import android.support.v7.widget.Toolbar;

import android.view.View;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.Button;

import android.widget.ExpandableListView;
public class MainActivity extends ActionBarActivity implements ExpandableListView.OnChildClickListener, View.OnClickListener {

private static FragmentManager mManager;

Button button1;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

setSupportActionBar(toolbar);
    button1 = (Button) findViewById(R.id.button1);
    mManager = getSupportFragmentManager();

   /* FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });*/

   // button1.setOnClickListener(this);
        button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Fragment fragment = null;


                mManager.findFragmentById(R.id.fragmentContainer);
                if (fragment == null) {
                    fragment = new sovety_Fragment();
                    mManager.beginTransaction()
                            .add(R.id.fragmentContainer, fragment)
                            .replace(R.id.fragmentContainer, fragment)
                            .addToBackStack(null)
                            .commit();
                }}


});
}



public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

    return false;
}

@Override
public void onClick(View v) {

}

}

[zymir]

You use the sappport lib, so you need to getSupportActionBar instead of getActionBar.