CODEWITHSUNDEEP
javaandroidadapter
Vlad Skurtolov
Vlad Skurtolov

Reputation: 1054

Android: Why isn't my ArrayAdapter getting populated?

For my program in Android I want to use simple ArrayAdapter, without overriding the ArraYAdapter class. The problem is that the adapter is not being showed on the activity.

    ArrayList<String> myList = generateListAndTaskText(intent);
    final ListView myListView =  (ListView) findViewById(R.id.widget_show_task_act_subtasks_listview);
    Log.d("ShowTaskAct", myList.size() + "");   //Log shows 2 items
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),
                R.layout.main_child_item_lay,R.id.main_child_item_text, myList);
    myListView.setAdapter(adapter);

Am I missing something here?

EDIT: The layout (simplified):

<android.support.constraint.ConstraintLayout 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"
android:background="@android:color/transparent">

<TextView
    android:id="@+id/widget_show_task_act_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginTop="8dp"
    android:text="Loading..."
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginStart="8dp" />

<ListView
    android:id="@+id/widget_show_task_act_subtasks_listview"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    android:layout_marginTop="0dp"
    app:layout_constraintTop_toBottomOf="@+id/widget_show_task_act_text" />

EDIT2: I forgot to tell you guys that the Activity is started from a screen widget. Thus should I use getApplicationContext() or getBaseContext() ?

Upvotes: 0

Views: 52

Answers (3)

Vlad Skurtolov
Vlad Skurtolov

Reputation: 1054

Problem solved: static height for the listview does the job.

Upvotes: 0

Juan
Juan

Reputation: 5589

You are missing the bottom constraint for the Listview, and the height is 0.

For the ListView, contraint the bottom to the bottom of parent or some other widget that is already constrained.

Upvotes: 1

vss
vss

Reputation: 1153

try like below:

ArrayAdapter<String> adapter = new ArrayAdapter<String> (getBaseContext(),
                android.R.layout.simple_dropdown_item_1line, myList);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
myListView.setAdapter(adapter);

Upvotes: 0

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