Android rating bar

import android.os.Bundle;

import android.app.Activity;

import android.view.View.OnClickListener;

import android.view.*;

import android.widget.Button; 

import android.widget.RatingBar; 

import android.widget.Toast; 

public class MainActivity extends Activity {

RatingBar r1;

Button b1;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              addListenerOnButtonClick(); 

       }

        public void addListenerOnButtonClick(){ 

               r1=(RatingBar)findViewById(R.id.ratingBar1); 

               b1=(Button)findViewById(R.id.button1); 

               //Performing action on Button Click 

               b1.setOnClickListener(new OnClickListener(){ 

        

                   @Override 

                   public void onClick(View arg0) { 

                       //Getting the rating and displaying it on the toast 

                       String rating=String.valueOf(r1.getRating()); 

                       Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show(); 

                   } 

                    

               }); 

           } 

} 

Android spinner

import android.view.View;

import android.widget.*;

import android.widget.AdapterView.OnItemSelectedListener;

public class MainActivity extends Activity implements OnItemSelectedListener{

Spinner s1;

String[] country = { "India", "USA", "China", "Japan", "Other",  }; 

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        s1=(Spinner)findViewById(R.id.spinner1);

                        s1.setOnItemSelectedListener(this);

//Creating the ArrayAdapter instance having the country list 

ArrayAdapter<String> aa = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,country); 

        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

   //Setting the ArrayAdapter data on the Spinner 

        s1.setAdapter(aa); 

}

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        String item = parent.getItemAtPosition(position).toString();

        Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

    }

public void onNothingSelected(AdapterView<?> arg0)

   {

   }

}

Android check box

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.*;

public class MainActivity extends Activity {

CheckBox c1,c2,c3;

Button b1;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        c1=(CheckBox) findViewById(R.id.checkBox1);

                        c2=(CheckBox) findViewById(R.id.checkBox2);

                        c3=(CheckBox) findViewById(R.id.checkBox3);

                        b1=(Button) findViewById(R.id.button1);

                        b1.setOnClickListener(L1);

            }

public OnClickListener L1=new OnClickListener()

    {

    public void onClick(View v)    {

            String h1="",h2="",h3="",h4;

            if(v==b1) {

                  if(c1.isChecked()==true)

                         h1=c1.getText().toString();

                  if(c2.isChecked()==true)

                         h2=c2.getText().toString();

                  if(c3.isChecked()==true)

                         h3=c3.getText().toString();

                    h4=h1 +" "+h2 +" "+h3;

                   Toast.makeText(getBaseContext(),h4,Toast.LENGTH_LONG).show();

            }

    }

    }; }

android Radio Button

import android.widget.*; 

import android.view.*;

import android.view.View.OnClickListener;

public class MainActivity extends Activity {

RadioButton r1,r2;

RadioGroup rg;

Button b1;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        r1=(RadioButton) findViewById(R.id.radio0);

                        r2=(RadioButton) findViewById(R.id.radio1);

                         rg=(RadioGroup) findViewById(R.id.radioGroup1);

                         b1=(Button) findViewById(R.id.button1);

                         b1.setOnClickListener(L1);

            }

public OnClickListener L1=new OnClickListener()

    {

    public void onClick(View v)

    {

            if(v==b1)

            {

                   if(r1.isChecked()==true)

                        Toast.makeText(getBaseContext(),r1.getText(),Toast.LENGTH_LONG).show();

                   if(r2.isChecked()==true)

                        Toast.makeText(getBaseContext(),r2.getText(),Toast.LENGTH_LONG).show();

            }

        }

    };

}

Calculator

import android.widget.*;

import android.view.*;

import android.view.View.OnClickListener;

public class MainActivity extends Activity {

EditText t1,t2,t3;

Button b1,b2,b3,b4,b5,b6;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        t1=(EditText) findViewById(R.id.editText1);

                        t2=(EditText) findViewById(R.id.editText2);

                        t3=(EditText) findViewById(R.id.editText3);

                        b1=(Button) findViewById(R.id.button1);

                        b2=(Button) findViewById(R.id.button2);

                        b3=(Button) findViewById(R.id.button3);

                        b4=(Button) findViewById(R.id.button4);

                        b5=(Button) findViewById(R.id.button5);

                        b6=(Button) findViewById(R.id.button6);

                        b1.setOnClickListener(s1);

                        b2.setOnClickListener(s1);

                        b3.setOnClickListener(s1);

                        b4.setOnClickListener(s1);

                        b5.setOnClickListener(s1);

                        b6.setOnClickListener(s1);     }

public OnClickListener s1=new OnClickListener()

            {

               public void onClick(View v){

                           if(v==b1){

                           int x=Integer.parseInt(t1.getText().toString());

                           int y=Integer.parseInt(t2.getText().toString());

                           int z=x+y;

                           t3.setText(String.valueOf(z));

                          }

                           if(v==b2){

                                       int x=Integer.parseInt(t1.getText().toString());

                                       int y=Integer.parseInt(t2.getText().toString());

                                       int z=x-y;

                                       t3.setText(String.valueOf(z));

                                      }

                           if(v==b3){

                                       int x=Integer.parseInt(t1.getText().toString());

                                       int y=Integer.parseInt(t2.getText().toString());

                                       int z=x*y;

                                       t3.setText(String.valueOf(z));

                                      }

                           if(v==b4){

                                       int x=Integer.parseInt(t1.getText().toString());

                                       int y=Integer.parseInt(t2.getText().toString());

                                       int z=x/y;

                                       t3.setText(String.valueOf(z));

                                      }

                           if(v==b5){

                                       int x=Integer.parseInt(t1.getText().toString());

                                       int y=Integer.parseInt(t2.getText().toString());

                                       int z=x%y;

                                       t3.setText(String.valueOf(z));

                                      }

                           if(v==b6){

                                       t1.setText("");

                                       t2.setText("");

                                       t3.setText("");

                                      }

               }

             };

}

simple interest calculations

import android.widget.*;

import android.view.*;

import android.view.View.OnClickListener;

public class MainActivity extends Activity {

Button b1;

EditText t1,t2,t3,t4;

      @Override

      protected void onCreate(Bundle savedInstanceState) {

                  super.onCreate(savedInstanceState);

                  setContentView(R.layout.activity_main);

                  t1=(EditText) findViewById(R.id.editText1);

                  t2=(EditText) findViewById(R.id.editText2);

                  t3=(EditText) findViewById(R.id.editText3);

                  t4=(EditText) findViewById(R.id.editText4);

                  b1=(Button) findViewById(R.id.button1);

                  b1.setOnClickListener(s1);

      }

      public OnClickListener s1=new OnClickListener()

      {

         public void onClick(View v){

                     if(v==b1){

                     float p=Float.parseFloat(t1.getText().toString());

                     float n=Float.parseFloat(t2.getText().toString());

                     float r=Float.parseFloat(t3.getText().toString());

                     float si=p*n*r/100;

                     t4.setText(String.valueOf(si));

                    }

         }};}