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

Posted by aroshinemunasinghe
aroshinemunasinghe
5,649 Points

After emu. it shows up "There is no data to display"

After I add ArrayAdapter..

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

        String[] daysOfTheWeek = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
        // Data days of the week.
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, daysOfTheWeek); // the key thing that all of them have in commin is they contain text views that can display the string data that we have.

        setListAdapter(adapter);

    }

I can see the list but also "There is no data to display" What have I done wrong?

Kourosh Raeen
Kourosh Raeen
23,733 Points
Kourosh Raeen
Kourosh Raeen
23,733 Points

So when you click on the 7 Day button you can see the days of the week listed but you also see the message "There is no data to display.", is that right?

aroshinemunasinghe
aroshinemunasinghe
5,649 Points

@Kourosh Raeen Yes!

aroshinemunasinghe
aroshinemunasinghe
5,649 Points

So I have copy pasted and got red warning @string :smile: I removed it and its working Thank you !! :pray: :smile:

Kourosh Raeen
Kourosh Raeen
23,733 Points
Kourosh Raeen
Kourosh Raeen
23,733 Points

You're welcome! Are you saying that you removed the line: android:text="@string/no_daily_forecast_data" ? Because without it the message "There is no data to display" will not get displayed when there is not data. You probably got the red warning because the following line is missing from the strings.xml file in the values folder:

<string name="no_daily_forecast_data">There is no data to display.</string>

If you add the above line that error should go away. Or you can just put the text directly in the TextView:

 <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="There is no data to display"
        android:id="@android:id/empty"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:textColor="#ffffffff"/>

However, the better practice is to add a string resource to string.xml as I explained above.

1 Answer

Kourosh Raeen
Kourosh Raeen
23,733 Points
Kourosh Raeen
Kourosh Raeen
23,733 Points

In the TextView in activity_daily_forecast.xml, are you using the special id: android:id="@android:id/empty" ? The code should look like this:

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

    <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>