What Is "Android.R.Layout.Simple_List_Item_1"

What is android.R.layout.simple_list_item_1?

Zakaria, that is a reference to an built-in XML layout document that is part of the Android OS, rather than one of your own XML layouts.

Here is a further list of layouts that you can use:
http://developer.android.com/reference/android/R.layout.html

(Updated link thanks @Estel: https://github.com/android/platform_frameworks_base/tree/master/core/res/res/layout )

You can actually view the code for the layouts.

what is android.R.layout.simple_list_item_1?

android.R.layout contains all of the publicly available layouts that the Android OS uses to display various items. android.R.layout.simple_list_item_1 is, as it's named, just a simple layout to display a snippet of text. It saves you from having to write simple layouts when using adapters and also affords you the native look and theme of the system in your application with minimal effort.

I have included the source from the GitHub mirror of the android.git.kernel.org repo

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:gravity="center_vertical"
    android:paddingLeft="6dip"
    android:minHeight="?android:attr/listPreferredItemHeight"
/>

What is difference between android.R.layout.simple_list_item_1 and android.R.layout.simple_list_item_2

The difference is the following. simple_list_item_1 contains only a TextView, whereas simple_list_item_2 has two inside a subclass of RelativeLayout. These are both taken from Jelly Bean.

simple_list_item_1

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceListItemSmall"
    android:gravity="center_vertical"
    android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
    android:paddingRight="?android:attr/listPreferredItemPaddingRight"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
/>

simple_list_item_2

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2006 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:mode="twoLine"
>

    <TextView android:id="@android:id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
    android:layout_marginLeft="?android:attr/listPreferredItemPaddingLeft"
    android:layout_marginTop="8dip"
        android:textAppearance="?android:attr/textAppearanceListItem"
    />

    <TextView android:id="@android:id/text2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@android:id/text1"
    android:layout_alignLeft="@android:id/text1"
        android:textAppearance="?android:attr/textAppearanceSmall"
    />

</TwoLineListItem>

According to the docs for ArrayAdapter:

By default this class expects that the provided resource id references
a single TextView.

So by default, an ArrayAdapter doesn't automatically fill in multiple TextView instances. You can, however, override the getView() method and fill in the two TextViews that appear in R.layout.simple_list_item_2

Android Studio can't find R.layout.simple_list_item_1, or any other default layout IDs

to use android predefined layouts, colors etc. You should use

android.R.layout.simple_list_item_1

probably you try to reach your own resources. Check your imports and you should see your R file.

Is there a way to change android.R.layout.simple_list_item_1, to my custom layout?

Use CTRL + Left click on android.R.layout.simple_list_item_1 to open it.


Copy the contents to your own XML layout file, and edit it as your wish.


Change

android.R.layout.simple_list_item_1

To

R.layout.your_layout

android.R.layout.simple_list_item_1 - TextColor is white - Android

It is so might be you are using a Dark theme so the text is white

• Solution1

Change the theme to Theme.Light

<style name="LightThemeSelector" parent="android:Theme.Light">
...
</style>

• Solution2

Just add the textColor to the textView

    <?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:textColor="#000000"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:textAppearance="?android:attr/textAppearanceListItemSmall" />

this style of coding in android? android.R.layout.simple_list_item_1

There's probably a line just below it that looks like

listView.setAdapter(adapter);

android.R.layout.simple_list_item_1 is a simple provided list item layout.

to define your own Adapter I would extend BaseAdapter - you'll have to implement a number of methods - getView being one of them. getView is where you define your list item layouts.

class SomeAdapter extends BaseAdapter {
    // implement me
    ...
} 

once you've done that, you can use it via

SomeAdapter adapter = new SomeAdapter();
listView.setAdapter(adapter);
// or, in your case
setListAdapter(adapter);

simple_list_item_1 can not be resolved or not a field

Change

aa=new ArrayAdapter<String>(this, R.layout.simple_list_item_1,items);

to

aa=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items);

It's currently trying to take the value of layout.simple_list_item_1 from your app's R class.

How to change simple_list_item_1 to modify list_item?

you can create a custom list view with 3 text view

now custom_list_view layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/name"
        android:text="@string/name"
        android:textSize="20sp"
        android:layout_marginTop="19dp"
        android:layout_alignParentTop="true"
        android:layout_toLeftOf="@+id/price"
        android:layout_toStartOf="@+id/price"
        android:layout_marginRight="30dp"
        android:layout_marginEnd="30dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/price"
        android:text="Price"
        android:textSize="20sp"
        android:layout_alignBaseline="@+id/name"
        android:layout_alignBottom="@+id/name"
        android:layout_centerHorizontal="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/stock"
        android:text="Stock"
        android:textSize="20sp"
        android:layout_alignBaseline="@+id/price"
        android:layout_alignBottom="@+id/price"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginRight="81dp"
        android:layout_marginEnd="81dp"/>
    </RelativeLayout>

Create List View in layout , i created in mainactivity layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.pro.salman.customlistview.MainActivity">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/list_item"/>

</RelativeLayout>

Custom List View Class

public class CustomListView extends BaseAdapter {


    private ArrayList<HashMap<String,String>> list;
    private LayoutInflater mLayoutInflater;
    private Context mContext;

    public CustomListView(ArrayList<HashMap<String,String>> list,Context c) {
        this.list = list;
        this.mContext = c;
        mLayoutInflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {


        View view = mLayoutInflater.inflate(R.layout.custom_list_view,parent,false);
        Holder h = new Holder();

            // set id's
        h.name = (TextView)(view.findViewById(R.id.name));
        h.price = (TextView)(view.findViewById(R.id.price));
        h.stock = (TextView)(view.findViewById(R.id.stock));

        HashMap<String,String> hashMap = new HashMap<>();
        hashMap = list.get(position);

        h.name.setText(hashMap.get("nameKey"));
        h.price.setText(hashMap.get("priceKey"));
        h.stock.setText(hashMap.get("stockKey"));


        return view;
    }


    private class Holder
    {
        TextView name;
        TextView price;
        TextView stock;
    }
}

And Now in mainactivity class

public class MainActivity extends AppCompatActivity {

private ListView mListView;
private ArrayList<HashMap<String,String>> mArrayList;




@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mArrayList = new ArrayList<HashMap<String, String>>();

    for(int i =0;i<20;i++)
    {
        HashMap<String,String> mHashMap = new HashMap<>();
        mHashMap.put("nameKey","name "+String.valueOf(i));
        mHashMap.put("priceKey","price "+String.valueOf(i));
        mHashMap.put("stockKey","stock "+String.valueOf(i));

        mArrayList.add(mHashMap);
    }


    mListView = (ListView)(findViewById(R.id.list_item));

    CustomListView customListView = new CustomListView(mArrayList,this);
    mListView.setAdapter(customListView);

}
}

Result

---

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