Fundamentals
Introduction
1st Android Application

OOPS Concepts
Class
Object
Abstraction
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Polymorphism
Inheritance
Message Passing
Dynamic Binding

UI Controls
TextView
Button
Toggle Button
CheckBox
Radio Button
Spinner
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Switch
EditText
AutoComplete
TextView

MultiAutoComplete
TextView

ImageView
ImageButton
Gallery
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TimePicker
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Layouts
LinearLayout
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Composite
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Transitions
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Advanced
Request Focus
View
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SurfaceView
NumberPicker
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Database
SharedPreference
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Telephone Manager
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Location Based Service
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Android Services
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Activity from a Service
Bind Activity to Service


Sample Projects
HMS
CNB
Login Screen
Camera Event
Browse Option
QR Code Events
Accelerometer Sensor
EditText from Spinner

Android Polymorphism

  1. Same Length Attributes Method Overloading
  2. Different Length Attributes Method Overloading

Note                     Download ADT Plugin Here.
Here I am using,
OS : Linux (Ubuntu 12.04)
Eclipse : Juno (Version 4.2.0)
Android API Level : 3 to 'n' as per need
Emulator API Level : It will be displayed in output image

A. Same Length Attributes Method Overloading


Step 1 : Select File -> New -> Project -> Android Application Project (or) Android Project. Fill the forms and click "Finish" button. If you have any doubt regarding create a new project Click Here.

Step 2 : Open res -> layout -> activity_main.xml (or) main.xml and add following code :

<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" >
 
    <TextView
        android:id="@+id/textView1"
        android:textSize="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="60dp"
        android:text="Polymorphism - Same Length" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:text="Get" />
 
    <TextView
        android:id="@+id/textView2"
        android:textSize="18dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="220dp"
        android:text="1" />
    
    <TextView
        android:id="@+id/textView3"
        android:textSize="18dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="270dp"
        android:text="2" />
    
    <TextView
        android:id="@+id/textView4"
        android:textSize="18dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="320dp"
        android:text="3" />
    
    <TextView
        android:id="@+id/textView5"
        android:textSize="18dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="370dp"
        android:text="4" />
 
</RelativeLayout>

Step 3 : Open src -> package -> MainActivity.java and add following code :

package balaji.polymorphism_ex1;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
	Button b;
	TextView tv1, tv2, tv3, tv4;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        b = (Button) findViewById(R.id.button1);
        
        tv1 = (TextView) findViewById(R.id.textView2);
        tv2 = (TextView) findViewById(R.id.textView3);
        tv3 = (TextView) findViewById(R.id.textView4);
        tv4 = (TextView) findViewById(R.id.textView5);
        
        b.setOnClickListener(new View.OnClickListener() {
			
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
					
			SubClass obj = new SubClass();
		
			String str1 = obj.method_overloading(10, 10);
		
			String str2 = obj.method_overloading(10, (float)10.123);
		
			String str3 = obj.method_overloading((float)10.123, 10);
		
			String str4 = obj.method_overloading((float)10.123, (float)10.123);
		
			tv1.setText(str1);
			tv2.setText(str2);
			tv3.setText(str3);
			tv4.setText(str4);
		}
	});
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

class SubClass {
	
	String method_overloading(int a, int b)
	{
		
		return "(int, int) Method Called";
	}
	
	String method_overloading(int a, float b)
	{
		
		return "(int, float) Method Called";
	}
	
	String method_overloading(float a, int b)
	{
		
		return "(float, int) Method Called";
	}
	
	String method_overloading(float a, float b)
	{
		
		return "(float, float) Method Called";
	}
}

Step 4 : Open AndroidManifest.xml and add following code :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="balaji.polymorphism_ex1"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="3"
        android:targetSdkVersion="15" />
 
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

Step 5 : Open res ->values ->strings.xml and add following code :

<resources>
 
    <string name="app_name">Polymorphism_Ex1</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
 
</resources>

Step 6 : Our output will be like this :


Output


Output









B. Different Length Attributes Method Overloading


Step 1 : Select File -> New -> Project -> Android Application Project (or) Android Project. Fill the forms and click "Finish" button. If you have any doubt regarding create a new project Click Here.

Step 2 : Open res -> layout -> activity_main.xml (or) main.xml and add following code :

<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" >
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="Polymorphism" />
 
    <TextView
        android:id="@+id/textView1"
        android:textSize="15dp"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp" />
    
    <TextView
        android:id="@+id/textView2"
        android:textSize="15dp"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="150dp" />
    
    <TextView
        android:id="@+id/textView3"
        android:textSize="15dp"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="200dp" />
    
    <TextView
        android:id="@+id/textView4"
        android:textSize="15dp"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="250dp" />
    
    <TextView
        android:id="@+id/textView5"
        android:textSize="15dp"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="300dp" />
 
</RelativeLayout>

Step 3 : Open src -> package -> MainActivity.java and add following code :

package balaji.polymorphism_ex2;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity {
	
	Button poly;
	TextView t1, t2, t3, t4, t5;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        poly = (Button) findViewById(R.id.button1);
        
        t1 = (TextView) findViewById(R.id.textView1);
        t2 = (TextView) findViewById(R.id.textView2);
        t3 = (TextView) findViewById(R.id.textView3);
        t4 = (TextView) findViewById(R.id.textView4);
        t5 = (TextView) findViewById(R.id.textView5);
        
        poly.setOnClickListener(new View.OnClickListener() {
			
		public void onClick(View v) {
			// TODO Auto-generated method stub
					
			SubClass obj = new SubClass ();
		
			t1.setText(String.valueOf(obj.display()));
		
			t2.setText(String.valueOf(obj.display(11)));
		
			t3.setText(String.valueOf(obj.display((float)15.26)));
		
			t4.setText(String.valueOf(obj.display(11, 20)));
		
			t5.setText(obj.display("Overloading"));
		}
	});
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}
 
class SubClass
{
	int display()
	{
		int a = 10;
		
		return a;		
	}
	
	int display(int temp1)
	{
		int a = 10;
		
		a = a + temp1;
		
		return a;
	}
	
	int display(int temp1, int temp2)
	{
		int c;
		
		c = temp1 + temp2;
		
		return c;
	}
	
	float display(float temp1)
	{
		float c;
		
		c = temp1 * 123 ;
		
		return c;
	}
	
	String display(String temp1)
	{
		String str = "Method ";
		
		str = str.concat(temp1);
		
		return str;
	}
}

Step 4 : Open AndroidManifest.xml and add following code :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="balaji.polymorphism_ex2"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="3"
        android:targetSdkVersion="15" />
 
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

Step 5 : Open res ->values ->strings.xml and add following code :

<resources>
 
    <string name="app_name">Polymorphism_Ex2</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
 
</resources>

Step 6 : Our output will be like this :


Output


Output









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