Hi Friends,

This blog will help you to expand TextView if textview has more than given line. Suppose you want visible only four line first time in TextView while your message length is greater than four line. In this case, you can give an another option button or textview ShowMore. After clicking on this button or textview your TextView will expand and will show complete message string.

Step-1 XML file

<TextView
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:id="@+id/text_msg"
    android:textColor="#000000"
    android:textSize="25dp"/>
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/text_show_more"
    android:textColor="#000000"
    android:gravity="right"
    android:layout_marginTop="8dp"
    android:text="Show More"
    android:textSize="25dp"/>

Step-2 Create an activity
 

public class ExpandTextView extends AppCompatActivity {
    private boolean isExpanded;
    private TextView mMessageTextView,mShowMoreTextView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.text_demo);

        mMessageTextView=(TextView)findViewById(R.id.text_msg);
        mShowMoreTextView=(TextView)findViewById(R.id.text_show_more);
        mMessageTextView.setText("Test line 1"+"Test line 2"+"Test line 3"+"Test line 4 "+"Test line 5 "+"Test line 6 "+
        "Test line 7 "+"Test line 8");

        mMessageTextView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (!isExpanded) {
                    if (mMessageTextView.getLineCount() > 2) {
                        isExpanded = false;
                        mShowMoreTextView.setVisibility(View.VISIBLE);
                        mMessageTextView.setMaxLines(2);
                    } else {
                        isExpanded = false;
                    }
                }
            }
        });

        mShowMoreTextView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (!isExpanded) {
                    isExpanded = true;
                    mMessageTextView.setMaxLines(800);
                    mShowMoreTextView.setText("Show Less");
                } else {
                    isExpanded = false;
                    mMessageTextView.setMaxLines(4);
                    mShowMoreTextView.setText("Show More");
                }
            }
        });

    }
}