How to add string at the bottom of a ScrollView

Question

I would like to know how to add new strings at the bottom of a ScrollView every time I press a button.

For example at the beginning there is sentence1, press button, then sentence2 is under sentence1, press button, sentence3 is under sentence2, etc

I know how to make a scrollView and I have an array of strings to display:

final int[] sentences = new int[]{
        R.String.sentence1, 
        R.String.sentence1, 
        R.String.sentence2, 
        R.String.sentence3, 
        R.String.sentence4
};

And I know how to make them appear one after another when a button is pressed (kind off replacing the previous one, like a TextSwitch but without the animation) :

if(nextSentenceId < sentences.length) {
   officeOBSDialog.setText(sentences[nextSentenceId]);
   ++nextSentenceId;
}

Do you have any idea how I could manage to do that or what could I use? It occured to me that I could use like a layout inflator but I don't know how to put that to practice and where to put it. Thanks in advance

Answer 1

I recommend you to use ListView or RecyclerView. https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView

However, if you consistently want to use ScrollView cause your screen UI is simple. You can simply wrap a LinearLayout with vertical orientation by a ScrollView.

activity.xml

<ScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fillViewport="true">

    <LinearLayout
        android:id="@+id/lnContainer"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <!-- your button declaration -->

    </LinearLayout>
</ScrollView>

In your activity java file, add new row programmatically by:

private int position=0;
final int[] sentences = new int[]{
    R.String.sentence1, 
    R.String.sentence1, 
    R.String.sentence2, 
    R.String.sentence3, 
    R.String.sentence4
};

//inside onCreate() method
yourButton.setOnClickListener(new View.OnClickListener(){
     public void onClick(View view){
         TextView textView = new TextView(YourActivityClass.this);
         textView.setText(sentences[position++]);
         ((LinearLayout)findViewById(R.id.lnContainer)).addView(textView);
     }
});