You can check my blog post on ExpandableTexTView:
The idea is, initially the TextView will show a small portion of a long text and when it is clicked, it will show the rest of the text.
So here is the code that how I solved it.
package com.rokonoid.widget;
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;
/**
* User: Bazlur Rahman Rokon
* Date: 9/7/13 - 3:33 AM
*/
public class ExpandableTextView extends TextView {
private static final int DEFAULT_TRIM_LENGTH = 200;
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, 0, trimLength + 1).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;
}
}
And add the following line in your attr.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="ExpandableTextView">
<attr name="trimLength" format="integer"/>
</declare-styleable>
</resources>
Put the following in your main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.rokonoid.widget.ExpandableTextView
android:id="@+id/lorem_ipsum"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
And test your activity
package com.rokonoid.widget;
import android.app.Activity;
import android.os.Bundle;
public class MyActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
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);
}
}
Reference: Android – Expandable TextView