android.text.TextUtils and android.text.Html

This example demonstrate how HTML encode/decode using android.text.TextUtils and android.text.Html.

HTML encode/decode

package com.example.androidtextutils;

import android.os.Bundle;
import android.app.Activity;
import android.text.Html;
import android.text.Spanned;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

 EditText textSrc;
 TextView textDest1, textDest2, textDest3, textDest4, textDest5;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  textSrc = (EditText)findViewById(R.id.textsrc);
  textDest1 = (TextView)findViewById(R.id.textdest1);
  textDest2 = (TextView)findViewById(R.id.textdest2);
  textDest3 = (TextView)findViewById(R.id.textdest3);
  textDest4 = (TextView)findViewById(R.id.textdest4);
  textDest5 = (TextView)findViewById(R.id.textdest5);

  Button buttonConvert = (Button)findViewById(R.id.convert);
  buttonConvert.setOnClickListener(buttonConvertOnClickListener);
 }
 
 View.OnClickListener buttonConvertOnClickListener =
  new View.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    String src = (String) textSrc.getText().toString();
    String t_htmlEncode = TextUtils.htmlEncode(src);
    textDest1.setText(t_htmlEncode);
    Spanned t_htmlEncode_fromHtml = Html.fromHtml(t_htmlEncode);
    textDest2.setText(t_htmlEncode_fromHtml);
    
    Spanned t_fromHtml = Html.fromHtml(src);
    textDest3.setText(t_fromHtml);
    String t_fromHtml_toHtml = Html.toHtml(t_fromHtml);
    textDest4.setText(t_fromHtml_toHtml);
    
    String t_escapeHtml = Html.escapeHtml(src); //API 16
    textDest5.setText(t_escapeHtml);
   }};
 

}

<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com" />

    <EditText
        android:id="@+id/textsrc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button 
        android:id="@+id/convert"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Html-encode the string" />
    <TextView
        android:text="--- TextUtils.htmlEncode(src) ---"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textdest1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:text="--- Html.fromHtml(TextUtils.htmlEncode(src)) ---"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textdest2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:text="--- Html.fromHtml(src) ---"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textdest3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:text="--- Html.toHtml(Html.fromHtml(src)) ---"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textdest4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:text="--- Html.escapeHtml(src) ---"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textdest5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>