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>
