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Android Android Lists and Adapters (2015) Standard ListViews Using a Default Adapter

Posted by Jarrett Perkins
Jarrett Perkins
2,902 Points

setListAdapter(adapter) not working

My project is able to build and run on my device, except when I click on the 7 DAY button, the screen goes blank white when it should display the array of Strings daysOfTheWeek. My code is:

package com.teamtreehouse.stormy;

import android.app.ListActivity; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.ArrayAdapter; import android.widget.ListView;

public class DailyForecastActivity extends ListActivity {

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

    String[] daysOfTheWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, daysOfTheWeek);
    setListAdapter(adapter);
}

}

2 Answers

David Axelrod
David Axelrod
36,073 Points
David Axelrod
David Axelrod
36,073 Points

I had the same error. make sure the code is within the onCreate method. There should be two curly braces after setListAdapter

Liam Peters
Liam Peters
8,792 Points
Liam Peters
Liam Peters
8,792 Points

Does your R.layout.activity_daily_forecast contain a listview with the ID "@android:id/list"?

ListActivity by default has a layout. You using setContentView(...); overrides this and it will look inside this layout for something with the id @android:id/list

Jarrett Perkins
Jarrett Perkins
2,902 Points

Yes, my XML file does have a ListView with the id @android:id/list. Here is my XML code:

<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: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="com.teamtreehouse.stormy.DailyForecastActivity" android:background="@drawable/bg_gradient" android:id="@android:id/empty">

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@android:id/list"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/no_daily_forecast_data"
    android:id="@android:id/empty"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"
    android:textColor="#ffffffff"/>

</RelativeLayout>

Liam Peters
Liam Peters
8,792 Points

Your top level element (it's cut off, but I assume it's a relative layout) has the id "@android:id/empty" and so does the text view. I can only assume that's causing some issues.