Android Fragment Error - android

I have a very basic application in which I am trying to create ListFragment on the MainActivity.
I keep on getting the following runtime error:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.proto1.listfragment/com.proto1.listfragment.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
I have two classes.
The first is MainActivity.java as shown below:
package com.proto1.listfragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
public class MainActivity extends FragmentActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
The second is the class relating to the listfragment SectionsList as shown below:
package com.proto1.listfragment;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
public class SectionsList extends ListFragment {
//Create an array to hold the sections
String sections [] = new String []{
"Starters", "Mains", "Sides", "Desserts", "Drinks"
};
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
//Create array adapter to store list of menu sections
ArrayAdapter<String> adapter = new ArrayAdapter<String>(inflater.getContext(), android.R.layout.simple_list_item_1,sections);
//Set list adapter of fragment
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
}
I then have one XML layout file called activity_main as shown below:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:orientation = "horizontal"
android:layout_height="fill_parent" >
<fragment
android:name = "com.proto1.listfragment.MainActivity"
android:id="#+id/sectionFrag"
android:layout_width = "wrap_content"
android:layout_height = "fill_parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world"
tools:context=".MainActivity" />
I am unable to see why this error is being generated. Can someone please shed some light on the issue? Many thanks!

A FragmentActivity is not a Fragment in itself. But rather, it is a way to easily interact with Fragments. The Fragment you call in your xml should be SectionList.

Edit following into your activity_main xml file
<fragment
android:name = "com.proto1.listfragment.SectionList"
android:id="#+id/sectionFrag"
android:layout_width = "wrap_content"
android:layout_height = "fill_parent"/>

Related

How to show empty text in list fragment?

I am using Google Place API to find nearest places. I am displaying map and list on two tabs. I have made two fragments. In one i am showing map and in second one i am using list. I have used an editext box on actionbar. When i am running my app it is crashing and giving nullpointer exception at setListAdapter.
It is my ListFragment file
import android.support.v4.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.aquib.android.place.Place;
import com.aquib.android.place.PlaceAdapter;
import com.aquib.android.place.R;
import java.util.List;
/**
* Created by dell on 2/9/2015.
*/
public class ListItemFragment extends ListFragment{
private PlaceAdapter adapter;
List<Place> placeList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_list, null);
TextView emptyTextView = (TextView) view.findViewById(android.R.id.empty);
emptyTextView.setTextSize(10);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
adapter = new PlaceAdapter(getActivity(), placeList);
setListAdapter(adapter);
}
}
and my fragment_list.xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#android:id/list" />
<TextView android:id="#id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:text="No data"/>
</LinearLayout>
When i will give input in edittext box and call place api and then parse json data. I have written Place class and then add place object in list. so please someone tell me that how to display empty text. app is showing exception in arrayadapter.getCount() method.
Your placeList is never initialized.
Moreover, in onCreateView(), you should probably create your view like this:
View view = inflater.inflate(R.layout.fragment_list, container, false);

Open an activity from a fragment (crashes)

I've been trying to open an activity from a fragment using the OnClick element in a TableRow but when I run the application it closes when trying to open the activity.
This is the Java code file:
package com.hello.turidf;
import com.hello.turidf.R;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TabsIndexM001Help extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.m_001_help, container, false);
return rootView;
}
public void open_m001_map(View view) {
Intent openmap = new Intent(getActivity(),M001MapActivity.class);
startActivity(openmap);
}
}
This is the XML code file (fragment):
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
.......>
<TableLayout
.......>
<TabelRow
android:onClick="open_m001_map"
....>
........
</TableRow>
</TableLayout>
</ScrollBiew>
In 'M001MapActivity' activity has not yet been modified, has the code created by default.
android:onClick execute the method passed like parameter in Activity and not in Fragment. If you want execute this method in fragment, remove this line and set OnClickListener programatically on fragment.

How to Change a size of fragment?

Pretty new to android development, I need to know how I can change the size of my ListView in my fragment pragmatically to cover the entire screen? match_parent, fill_parent didn't work.
I have hard coded values of 500dp
Here is my fragment
<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"
tools:context=".MainActivity">
<ListView
android:id="#android:id/list"
android:layout_width="500dp"
android:layout_height="500dp"
android:divider="#null"
android:dividerHeight="0dp"
android:layout_marginTop="0dp">
</ListView>
</RelativeLayout>
and here is JAVA my fragment code:
import android.app.ListFragment;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import java.util.List;
public class MyFragment extends ListFragment {
List<data> flowers = new datadata().getdatas();
public MyFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dataArrayAdapter adapter = new dataArrayAdapter(getActivity(),
R.layout.data_listitem,
flowers);
setListAdapter(adapter);
}
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.my_fragment, container, false);
return rootView;
}
}
here is my main Activity class
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/myContainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbarStyle="insideOverlay"
android:scrollbars="none"
android:fadeScrollbars="true"
android:fitsSystemWindows="true"
android:layout_gravity="top"
>
</ScrollView >
and this is my main activity java code:
package mshirvan.example.com.netplex;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.content.Intent;
import android.media.Image;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import android.view.View.OnClickListener;
import data.row1;
public class MainActivity extends Activity {
public static float screenx = 0;
public static float screeny = 0;
public static int screenpixelx = 0;
public static int screenpixely = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ScreenUtility utility = new ScreenUtility(this);
screenx = utility.getWidth();
screeny = utility.getHeight();
screenpixelx = utility.getPixelWidth();
screenpixely = utility.getPixelHeight();
MyFragment frag = new MyFragment();
getFragmentManager().beginTransaction()
.add(R.id.myContainer, frag)
.commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.action_settings) {
ScreenUtility utility = new ScreenUtility(this);
String output = "Width: " + utility.getWidth() + ", " +
"Height: " + utility.getHeight();
return true;
}
return super.onOptionsItemSelected(item);
}
}
Add the following to your fragment RelativeLayout. This should be as follows:
android:layout_width="match_parent"
android:layout_height="500dp"
For example the map layout fragment should be as follows :
<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="500dp"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity"
>
<com.google.android.gms.maps.MapView
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
Then add this fragment layout in the main layout.
put these in your listview too:
android:layout_width="match_parent"
android:layout_height="match_parent"
or you can change the layoutparameters to match_parent in yout fragment
that contains the listview.
you have to set the fragment container height to match parent not ListView. in your case ,ListView will fill it's parent height. ListView's parent is RelativeLayout and the RelativeLayout height is matchParent that means , RelativeLayout will also fill it's container and it's container is your fragment place holder that defined in your activity's layout file. you have to set that container's height to matchParent.
I think the problem is that you are trying to add fragment to ScrollView. use FrameLayout with android:layout_height=match_parent for fragment's container and if you have to add multiple fragments, then define multiple FrameLayouts in your activity's layout or add them dynamically.

No output from fragments in android.

Using fragments for the first time. As fragment in itself an activity, going by the documentation, I think I've written it correctly in the manifest.xml.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/example_fragment"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment class="com.test.methods.ExampleFragment"
android:id="#+id/list"
android:layout_weight="1"
android:layout_width="0px"
android:layout_height="match_parent" />
<FrameLayout android:id="#+id/details" android:layout_weight="1"
android:layout_width="0px"
android:layout_height="match_parent" />
</LinearLayout>
My fragment:
package com.test.methods;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import com.crumbin.main.R;
public class ExampleFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.id.list,
Shakespeare.TITLES));
return inflater.inflate(R.layout.example_fragment, container, false);
}
}
My Activity:
package com.test.methods;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
public class DemoUserActivity extends FragmentActivity{
protected void OnCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
if (savedInstanceState == null)
{
ExampleFragment details = new ExampleFragment();
details.setArguments(getIntent().getExtras());
getSupportFragmentManager().beginTransaction().add(
android.R.id.content,details).commit();
}
}
}
My intent:
intent = new Intent().setClass(this, DemoUserActivity.class);
spec = tabHost.newTabSpec("list").setIndicator("FragmentTest",
res.getDrawable(R.drawable.icon_list_tab))
.setContent(intent);
tabHost.addTab(spec);
I get no output out of this. I tried debugging but it is not even reaching my activity file.
No Activity is different thing, and Fragment is different, you can use these to create your application moduler, and replace one with another with minimum efforts, but can not use as a replacement of other, if You want to use a fragment, you need to declare an activity, in that activity you need to add your fragment, individual fragment without Activity can not be used.

Difficulties with basic fragment layout

I'm trying to get my head around fragments in order to have my apps prepped for ICS.
I have the following files to just get the most basic fragment app you can have. It should have this when launched: One Fragment Layout with a text view "Fragment 1" and next to it another Fragment Layout with "Fragment2".
My package name is com.mwerner.fragments
My files are:
FragmentsActivity.java
ExamplesFragment.java
ExamplesFragment2.java
examples_fragment.xml
examples_fragment2.xml
main.xml
The code for FragmentsActivity.java is:
package com.mwerner.fragments;
import android.app.Activity;
import android.os.Bundle;
public class FragmentsActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
ExamplesFragment.java
package com.mwerner.fragments;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ExamplesFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.examples_fragment, container, false);
}
}
ExamplesFragment2.java
package com.mwerner.fragments;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ExamplesFragment2 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.examples_fragment2, container, false);
}
}
The examples_fragment.xml files just have a linear layout with a textview in it...
Here is the code for the main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<fragment
class="com.mwerner.fragments$ExamplesFragment"
android:id="#+id/list"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="fill_parent"
/>
<fragment
class="com.mwerner.fragments$ExamplesFragment2"
android:id="#+id/viewer"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="fill_parent" />
</LinearLayout>
The app crashes on startup with the error
11-07 18:12:12.519: E/AndroidRuntime(696): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mwerner.fragments/com.mwerner.fragments.FragmentsActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
Can you please tell me what is wrong here? I pretty much copied / pasted the code from the google developers page for fragments.
You defined the path to your fragments incorrectly in your layout xml. Correct the class attributes. Try this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<fragment
class="com.mwerner.fragments.ExamplesFragment"
android:id="#+id/list"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="fill_parent"
/>
<fragment
class="com.mwerner.fragments.ExamplesFragment2"
android:id="#+id/viewer"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="fill_parent" />
</LinearLayout>
Try extending FragmentActivity
public class FragmentsActivity extends FragmentActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
When I was writing my first program on Fragments using I incurred same error. Instead of extending "Activity" extend "FragmentActivity" in your launcher activity.

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