Monday, January 19, 2015

Android HashTag Detection Sample

This post about how to detect hashtag text and linkfy.

like Instagram, twitter ,  google+ and facebook tags.

Check the below example.

Screen Shot






Source Code

package com.vj.hashtags;

import java.util.ArrayList;
import java.util.regex.Pattern;

import com.vj.hashtags.R;

import android.app.Activity;
import android.os.Bundle;
import android.text.util.Linkify;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

//public static variable for demo purpose
//we'll use this ArrayList in other activity
public static ArrayList<String> tagList=new ArrayList<String>();
private ArrayAdapter<String> adapter;
private ListView tagListView;
private EditText tagEditText;
private Button addButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialize variables
tagListView = (ListView)findViewById(R.id.tagListView);
tagEditText = (EditText)findViewById(R.id.tagEditText);
addButton = (Button)findViewById(R.id.addButton);

//Extend an ArrayAdapter so that we can make 
//our TextView HashTag compatible 
adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,
tagList){
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView hashView;
if (convertView == null) {
hashView = new TextView(MainActivity.this);
} else 
hashView = (TextView) convertView;
//Get the message from list and set as text
String message = tagList.get(position);
hashView.setText(message);
//Pattern to find if there's a hash tag in the message
//i.e. any word starting with a # and containing letter or numbers or _
Pattern tagMatcher = Pattern.compile("[#]+[A-Za-z0-9-_]+\\b");
//Scheme for Linkify, when a word matched tagMatcher pattern,
//that word is appended to this URL and used as content URI
        String newActivityURL = "content://com.vj.hashtags.tagdetailsactivity/";
       
        //Attach Linkify to TextView
        Linkify.addLinks(hashView, tagMatcher, newActivityURL);
return hashView;
}
};
//assign custom adapter to messages listview
tagListView.setAdapter(adapter);

//Add text from EditText to our messages list on button click
addButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String message = tagEditText.getText().toString();
if(message.trim()!="")
{
tagList.add(0,"#"+message);
adapter.notifyDataSetChanged();
tagEditText.setText("");
}
}
});
}

@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;
}


}




Tag details Activity

package com.vj.hashtags;


import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;

import android.widget.TextView;

public class TagDetailsActivity extends Activity {
TextView selectedTag;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       
        selectedTag = new TextView(this);
        //Get the content URI
        Uri uri = getIntent().getData();
        //strip off hashtag from the URI
        String tag=uri.toString().split("/")[3];
        
        selectedTag.setText("Selected hash tag :" +tag);
        
        setContentView(selectedTag);
}

}


Manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.vj.hashtags"
    android:versionCode="1"
    android:versionName="1.0" >

    <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" >
<provider
            android:name="com.vj.hashtags.TagProvider"
            android:authorities="com.vj.hashtags.tagdetailsactivity" />
        <activity
            android:name="com.vj.hashtags.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>
        <activity android:name="com.vj.hashtags.TagDetailsActivity"
            android:label = "@string/app_name">
            <intent-filter >
            <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.item/vnd.cc.tag" />
               </intent-filter> 
        </activity>
    </application>

</manifest>








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