package com.example.expandtextviewdemo;

import android.content.Context;

import android.content.res.TypedArray;

import android.text.SpannableStringBuilder;

import android.util.AttributeSet;

import android.view.View;

import android.widget.TextView;

public class ExpandableTextView extends TextView {

    private static final int DEFAULT_TRIM_LENGTH = ;

    private static final String ELLIPSIS = ".....";

    private CharSequence originalText;

    private CharSequence trimmedText;

    private BufferType bufferType;

    private boolean trim = true;

    private int trimLength;

    public ExpandableTextView(Context context) {

        this(context, null);

    }

    public ExpandableTextView(Context context, AttributeSet attrs) {

        super(context, attrs);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ExpandableTextView);

        this.trimLength = typedArray.getInt(R.styleable.ExpandableTextView_trimLength, DEFAULT_TRIM_LENGTH);

        typedArray.recycle();

        setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                trim = !trim;

                setText();

                requestFocusFromTouch();

            }

        });

    }

    private void setText() {

        super.setText(getDisplayableText(), bufferType);

    }

    private CharSequence getDisplayableText() {

        return trim ? trimmedText : originalText;

    }

    @Override

    public void setText(CharSequence text, BufferType type) {

        originalText = text;

        trimmedText = getTrimmedText(text);

        bufferType = type;

        setText();

    }

    private CharSequence getTrimmedText(CharSequence text) {

        if (originalText != null && originalText.length() > trimLength) {

            return new SpannableStringBuilder(originalText, , trimLength + ).append(ELLIPSIS);

        } else {

            return originalText;

        }

    }

    public CharSequence getOriginalText() {

        return originalText;

    }

    public void setTrimLength(int trimLength) {

        this.trimLength = trimLength;

        trimmedText = getTrimmedText(originalText);

        setText();

    }

    public int getTrimLength() {

        return trimLength;

    }

}

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="ExpandableTextView">

        <attr name="trimLength" format="integer" />

    </declare-styleable>

</resources>

<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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".ExpandableTextActivity" >

    <com.example.expandtextviewdemo.ExpandableTextView

        android:id="@+id/lorem_ipsum"

        android:textSize="20sp"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content" />

</RelativeLayout>

package com.example.expandtextviewdemo;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class ExpandableTextActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_expandable_text);

        String yourText = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "

                + "Ut volutpat interdum interdum. Nulla laoreet lacus diam, vitae "

                + "sodales sapien commodo faucibus. Vestibulum et feugiat enim. Donec "

                + "semper mi et euismod tempor. Sed sodales eleifend mi id varius. Nam "

                + "et ornare enim, sit amet gravida sapien. Quisque gravida et enim vel "

                + "volutpat. Vivamus egestas ut felis a blandit. Vivamus fringilla "

                + "dignissim mollis. Maecenas imperdiet interdum hendrerit. Aliquam"

                + " dictum hendrerit ultrices. Ut vitae vestibulum dolor. Donec auctor ante"

                + " eget libero molestie porta. Nam tempor fringilla ultricies. Nam sem "

                + "lectus, feugiat eget ullamcorper vitae, ornare et sem. Fusce dapibus ipsum"

                + " sed laoreet suscipit. ";

        ExpandableTextView expandableTextView = (ExpandableTextView) findViewById(R.id.lorem_ipsum);

        expandableTextView.setText(yourText);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.expandable_text, menu);

        return true;

    }

}