Java Andorid Program to Demonstrate a Match Filter

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Here is source code of the Program demonstrate a Match Filter in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

To add additional conditions to Regular Expression pattern matches, implement acceptMatch method in a Match Filter. When a potential match is found, acceptMatch method is triggered, with the match start and end index (along with the full text being searched) passed in as parameters.
To simply when a match corresponding to a defined pattern is found in the corresponding sentence the acceptMatch method is triggered which specifies which word are to convert into a hyperlink.

Main Activity

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package com.example.matchfilter;
 
import java.util.regex.Pattern;
 
import android.os.Bundle;
import android.app.Activity;
import android.text.util.Linkify;
import android.text.util.Linkify.MatchFilter;
import android.view.Menu;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        MatchFilter myMatchFilter = new MatchFilter() {
            @Override
            public boolean acceptMatch(CharSequence cs, int start, int end) {
                return ((start == 0 || cs.charAt(start - 1) == '!') && !(cs
                        .charAt(start) == 'p'));
            }
        };
 
        TextView myCustomLink2 = (TextView) findViewById(R.id.textview1);
        Pattern pattern2 = Pattern.compile("[a-zA-Z]+");
        myCustomLink2
                .setText("press one of these words to search it on google:"
                        + " !Google !Linkify !Sanfoundry");
        Linkify.addLinks(myCustomLink2, pattern2,
                "http://www.google.ie/search?q=", myMatchFilter, null);
 
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

Xml

Remember to add permission to acess internet by specifying so in the Andorid Manifest.

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AndoridManifest.xml

 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.matchfilter"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-permission android:name="android.permission.INTERNET" />
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.matchfilter.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

Activity_Main.xml

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<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=".MainActivity" >
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        android:id="@+id/textview1" />
 
</RelativeLayout>

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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