How to create a a expandable view in android?

Question

I want to expand the view on clicking the + button and this + sign changes to - when the view expanded.Again when i click the - button the view should be shrink. Inside the view i have some TextView field.Please anyone suggest me.I am new to android.

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score 0 · Answer 1 · edited Jun 28 '17 at 10:48

0

You can visible or gone particular layout on button click event at runtime like below code:

findViewById(R.id.yourButtonId).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mainView.setVisibility(View.GONE);
            }
        });

edited Jun 28 '17 at 10:48

Shreeya Chhatrala

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answered Jun 28 '17 at 10:30

Vishal Vaishnav

3,346
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57

But this is not as i expected. – Rishikesh Rahi Jun 28 '17 at 12:26
Then what do you want to expect? – Vishal Vaishnav Jun 28 '17 at 12:36

score 0 · Accepted Answer · answered Jun 28 '17 at 10:37

This answer solves the question.

public class ExpandableTextView extends TextView implements OnClickListener
{   
private static final int MAX_LINES = 5;
private int currentMaxLines = Integer.MAX_VALUE;

public ExpandableTextView(Context context)
{
    super(context);
    setOnClickListener(this);
}
public ExpandableTextView(Context context, AttributeSet attrs, int defStyle)
{
    super(context, attrs, defStyle);
    setOnClickListener(this);
}

public ExpandableTextView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    setOnClickListener(this);
}

@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter)
{
    /* If text longer than MAX_LINES set DrawableBottom - I'm using '...' icon */
    post(new Runnable()
    {
        public void run()
        {
            if (getLineCount()>MAX_LINES)
                setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, R.drawable.icon_more_text);
            else
                setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);

            setMaxLines(MAX_LINES);             
        }
    });
}


@Override
public void setMaxLines(int maxLines)
{
    currentMaxLines = maxLines;
    super.setMaxLines(maxLines);
}

/* Custom method because standard getMaxLines() requires API > 16 */
public int getMyMaxLines()
{
    return currentMaxLines;
}

@Override
public void onClick(View v)
{
    /* Toggle between expanded collapsed states */
    if (getMyMaxLines() == Integer.MAX_VALUE)
        setMaxLines(MAX_LINES);
    else
        setMaxLines(Integer.MAX_VALUE);
}

}

How to create a a expandable view in android?

2 Answers2