How to close a windows by call finish() in Fragment in android?

I created a Tabbed Activaity using Android Studio 1.2.2 wizard, I hope to close this window when I click the button btnClose, I write the code rootView.getContext().finish(); , but it's wrong, and PlaceholderFragmentOld.this.finish(); is wrong too.

How can I do? Thanks!

package; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import; import android.widget.Button; import; import info.dodata.messagecleanup.R; import bll.PublicParFun; import info.dodata.messagecleanup.R; public class PlaceholderFragmentOld extends Fragment { private AdView adView; public PlaceholderFragmentOld() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.cleanup_delete_fragment_old, container, false); adView=(AdView) rootView.findViewById(; PublicParFun.SetAD(adView); SetButtons(rootView); return rootView; } private void SetButtons(final View rootView){ rootView.findViewById( View.OnClickListener() { @Override public void onClick(View v) { rootView.getContext().finish(); } }); } }

package ui; import java.util.Locale; import; import; import; import; import; import; import android.os.Bundle; import; 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; import info.dodata.messagecleanup.R; import; import; import; import; public class CleanupDelete extends ActionBarActivity implements ActionBar.TabListener { SectionsPagerAdapter mSectionsPagerAdapter; ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.cleanup_delete); final ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); mViewPager = (ViewPager) findViewById(; mViewPager.setAdapter(mSectionsPagerAdapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { actionBar.addTab( actionBar.newTab() .setText(mSectionsPagerAdapter.getPageTitle(i)) .setTabListener(this)); } } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { Fragment fragment; switch(position){ case 0: fragment = new PlaceholderFragmentOld(); break; case 1: fragment = new PlaceholderFragmentReduce(); break; case 2: fragment = new PlaceholderFragmentTrim(); break; case 3: fragment = new PlaceholderFragmentPerson(); break; default: throw new IllegalArgumentException("Invalid section number"); } return fragment; } @Override public int getCount() { return 4; } @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return getString(R.string.Tab_Old); case 1: return getString(R.string.Tab_Reduce); case 2: return getString(R.string.Tab_Trim); case 3: return getString(R.string.Tab_Person); } return null; } } }


<?xml version="1.0" encoding="utf-8"?> < xmlns:android="" xmlns:tools="" android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent" />


<RelativeLayout xmlns:android="" xmlns:tools="" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/border_ui" > <LinearLayout android:id="@+id/linearLayoutMain" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:paddingTop="20dip" android:paddingLeft="10dip" android:paddingRight="10dip" android:orientation="vertical" > <TextView android:id="@+id/tVDescription" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="2dip" style="@style/myTextDesciption" android:text="This is a descript"/> </LinearLayout> <LinearLayout android:id="@+id/linearLayoutToolBar" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:gravity="center" android:orientation="horizontal" android:layout_alignParentBottom="true" android:weightSum="4" > <Button android:id="@+id/btnDelete" style="@style/myTextMedium" android:layout_width="0dip" android:layout_height="fill_parent" android:layout_gravity="center" android:layout_weight="1" android:text="@string/BtnDelete" /> <Button android:id="@+id/btnClose" style="@style/myTextMedium" android:layout_width="0dip" android:layout_height="fill_parent" android:layout_gravity="center" android:layout_weight="1" android:text="@string/BtnClose" /> </LinearLayout> </RelativeLayout>

-------------Problems Reply------------

finish() can only be called in an Activity. Given that, you do it this way:

// Somewhere in your fragment

private void finishActivity() {
if(getActivity() != null) {

And you could then call that method to finish your Activity:

// Somewhere in your click listener


IMPORTANT: There is a possibility for getActivity() to return null. This is especially dangerous when the fragment is being detached from your Activity (when using a ViewPager or when you're juggling between numerous fragments in an activity). Calling it without checking will pose your code to the threat of NullPointerException.

You may do something like this.

public void onClick(View v) {

You should use getActivity().finish();

Category:android Views:8 Time:2018-12-18
Tags: android

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