DatabaseDemo - Example

1. Create a project : DatabaseDemo
2. Do some changes in activity_main.xml
3. Create EditText and Button
<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="com.example.databasedemo.MainActivity" >

    <EditText
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="Enter Name" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/load"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="126dp"
        android:layout_marginRight="34dp"
        android:text="Load Data" />

    <Button
        android:id="@+id/save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/load"
        android:layout_alignBottom="@+id/load"
        android:layout_alignLeft="@+id/email"
        android:text="Save Data" />

    <EditText
        android:id="@+id/email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/load"
        android:layout_below="@+id/name"
        android:layout_marginTop="44dp"
        android:ems="10"
        android:hint="Enter email id" />

</RelativeLayout>

4. Add these EditText and Button description in MainActivity.java class
package com.example.databasedemo;

import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
   
    EditText name, email;
    Button save, load;
    DataHandler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        name = (EditText) findViewById(R.id.name);
        email = (EditText) findViewById(R.id.email);
        save = (Button) findViewById(R.id.save);
        load = (Button) findViewById(R.id.load);
       
        save.setOnClickListener(new OnClickListener() {
           
            @Override
            public void onClick(View v) {
                String getName = name.getText().toString();
                String getEmail = email.getText().toString();
               
                handler = new DataHandler(getBaseContext());
                handler.open();
                long id = handler.insertData(getName, getEmail);
                Toast.makeText(getBaseContext(), "Data inserted", Toast.LENGTH_LONG).show();
                handler.close();
            }
        });
       
        load.setOnClickListener(new OnClickListener() {
           
            @Override
            public void onClick(View v) {
                String getName, getEmail;
                getName = "";
                getEmail = "";
               
                handler = new DataHandler(getBaseContext());
                handler.open();
                Cursor C = handler.returnData();
                if(C.moveToFirst()){
                    do{
                        getName = C.getString(0);
                        getEmail = C.getString(1);
                   
                    } while(C.moveToNext());
                }
                handler.close();
                Toast.makeText(getBaseContext(), "Name: " + getName + " and Email: " + getEmail, Toast.LENGTH_LONG).show();
            }
        });
    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

5. Create another java class DataHandler.java as required to handle the data
package com.example.databasedemo;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DataHandler {
    public static final String NAME = "name";
    public static final String EMAIL = "email";
    public static final String TABLE_NAME = "mytable";
    public static final String DATA_BASE_NAME = "mydatabase";
    public static final int DATABASE_VERSION = 1;
    public static final String CREATE_TABLE = "create table mytable (name text not null, email text not null)";
   
    DataBaseHelper dbhelper;
    Context context;
    SQLiteDatabase db;
   
    public DataHandler (Context context){
        this.context = context;
        dbhelper = new DataBaseHelper(context);
    }
    private static class DataBaseHelper extends SQLiteOpenHelper{

        public DataBaseHelper(Context context) {
            super(context, DATA_BASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            try {
                db.execSQL(CREATE_TABLE);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
       
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS mytable");
            onCreate(db);
           
        }
       
    }
   
    public DataHandler open(){
        db = dbhelper.getWritableDatabase();
        return this;
    }
    public void close(){
        dbhelper.close();
    }
   
    public long insertData(String name, String email){
        ContentValues content = new ContentValues();
        content.put(NAME, name);
        content.put(EMAIL, email);
        return db.insertOrThrow(TABLE_NAME, null, content);
    }
   
    public Cursor returnData(){
        return db.query(TABLE_NAME, new String[] {NAME, EMAIL}, null, null, null, null, null);
    }
   
}

Read more...

Android: SeekBar Example

1. Create Project named SeekBarExample
2. Create main.xml
<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" >

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_margin="10dp"
        android:progressDrawable="@drawable/styled_progress"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:thumb="@drawable/thumbler_small"
         android:indeterminate="false" />

</RelativeLayout>

3. Create drawable folder in res
4. Create styled_progress in drawable folder
<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+android:id/SecondaryProgress"
        android:drawable="@drawable/progress_cyan"/>
    <item
        android:id="@+android:id/progress"
        android:drawable="@drawable/progress_red"/>

</layer-list>

5. Create MainActivity.java
package com.example.seekbarexample;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity {
    SeekBar mybar;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mybar = (SeekBar) findViewById(R.id.seekBar1);
       
        mybar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
           
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
               
                //add here your implementation
            }
           
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

                //add here your implementation
            }
           
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {

                //add here your implementation
            }
        });
    }


}

Read more...

Android Sliding Navigation Drawer – Example

Create Layout

activity_main.xml

<android.support.v4.widget.DrawerLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/drawer_layout"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <FrameLayout

        android:id="@+id/content_frame"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

    <ListView android:id="@+id/left_drawer"

        android:layout_width="240dp"

        android:layout_height="match_parent"

        android:layout_gravity="start"

        android:choiceMode="singleChoice"

        android:divider="@android:color/transparent"

        android:dividerHeight="0dp"

        android:background="#fff"/>

</android.support.v4.widget.DrawerLayout>

 menu_detail_fragment.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:gravity="center"

    android:background="#5ba4e5"

    android:layout_height="match_parent">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="40px"

        android:textColor="#ffffff"

        android:layout_gravity="center"

        android:id="@+id/detail"/>

</LinearLayout>

 MainActivity.java

public class MainActivity extends Activity {

       String[] menu;

       DrawerLayout dLayout;

       ListView dList;

       ArrayAdapter<String> adapter;

  @Override

  protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

        menu = new String[]{"Home","Android","Windows","Linux","Raspberry Pi","WordPress","Videos","Contact Us"};

          dLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

          dList = (ListView) findViewById(R.id.left_drawer);

          adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,menu);

          dList.setAdapter(adapter);

      dList.setSelector(android.R.color.holo_blue_dark);

          dList.setOnItemClickListener(new OnItemClickListener(){

        @Override

        public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {

          dLayout.closeDrawers();

          Bundle args = new Bundle();

          args.putString("Menu", menu[position]);

          Fragment detail = new DetailFragment();

          detail.setArguments(args);

            FragmentManager fragmentManager = getFragmentManager();

          fragmentManager.beginTransaction().replace(R.id.content_frame, detail).commit();

        }

          });

  }

}

DetailFragment.java

public class DetailFragment extends Fragment {

    TextView text;

    @Override

    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle args) {

        View view = inflater.inflate(R.layout.menu_detail_fragment, container, false);

        String menu = getArguments().getString("Menu");

        text= (TextView) view.findViewById(R.id.detail);

        text.setText(menu);

        return view;

    }

}

 

Read more...

Android Custom ListView with Images and Text – Example

Create Layout:

activity_main.xml

<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" >

    <ListView

       android:id="@+id/list"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

    </ListView>

</RelativeLayout>

 

list_single.xml

<?xml version="1.0" encoding="utf-8"?>

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <TableRow>

        <ImageView

            android:id="@+id/img"

            android:layout_width="50dp"

            android:layout_height="50dp"/>

        <TextView

            android:id="@+id/txt"

            android:layout_width="wrap_content"

            android:layout_height="50dp" />

</TableRow>

</TableLayout>

 

Create Activity:

CustomList.java

public class CustomList extends ArrayAdapter<String>{
    private final Activity context;
    private final String[] web;
    private final Integer[] imageId;
    public CustomList(Activity context,
            String[] web, Integer[] imageId) {
        super(context, R.layout.list_single, web);
        this.context = context;
        this.web = web;
        this.imageId = imageId;
    }
    @Override
    public View getView(int position, View view, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View rowView= inflater.inflate(R.layout.list_single, null, true);
        TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
        txtTitle.setText(web[position]);
        imageView.setImageResource(imageId[position]);
        return rowView;
    }
}

MainActivity.java

public class MainActivity extends Activity {

  ListView list;

  String[] web = {

    "Google Plus",

      "Twitter",

      "Windows",

      "Bing",

      "Itunes",

      "Wordpress",

      "Drupal"

  } ;

  Integer[] imageId = {

      R.drawable.image1,

      R.drawable.image2,

      R.drawable.image3,

      R.drawable.image4,

      R.drawable.image5,

      R.drawable.image6,

      R.drawable.image7

  };

  @Override

  protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    CustomList adapter = new

        CustomList(MainActivity.this, web, imageId);

    list=(ListView)findViewById(R.id.list);

        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override

                public void onItemClick(AdapterView<?> parent, View view,

                                        int position, long id) {

                    Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();

                }

            });

  }

}

 

 

Read more...

Android Custom GridView with Images and Text – Example

Create Layout:

activity_main.xml

<LinearLayout 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"

    tools:context=".MainActivity" >

    <GridView

         android:numColumns="auto_fit"

         android:gravity="center"

         android:columnWidth="100dp"

         android:stretchMode="columnWidth"

         android:layout_width="fill_parent"

         android:layout_height="fill_parent"

         android:id="@+id/grid"

         />

</LinearLayout>

 

grid_single.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:padding="5dp" >

    <ImageView

        android:id="@+id/grid_image"

        android:layout_width="50dp"

        android:layout_height="50dp">

    </ImageView>

    <TextView

        android:id="@+id/grid_text"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="15dp"

        android:textSize="9sp" >

    </TextView>

</LinearLayout>

 

Create Activity:

CustomGrid.java

public class CustomGrid extends BaseAdapter{

    private Context mContext;

    private final String[] web;

    private final int[] Imageid;

      public CustomGrid(Context c,String[] web,int[] Imageid ) {

          mContext = c;

          this.Imageid = Imageid;

          this.web = web;

      }

    @Override

    public int getCount() {

      // TODO Auto-generated method stub

      return web.length;

    }

    @Override

    public Object getItem(int position) {

      // TODO Auto-generated method stub

      return null;

    }

    @Override

    public long getItemId(int position) {

      // TODO Auto-generated method stub

      return 0;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

      // TODO Auto-generated method stub

      View grid;

      LayoutInflater inflater = (LayoutInflater) mContext

        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

          if (convertView == null) {

            grid = new View(mContext);

        grid = inflater.inflate(R.layout.grid_single, null);

            TextView textView = (TextView) grid.findViewById(R.id.grid_text);

            ImageView imageView = (ImageView)grid.findViewById(R.id.grid_image);

            textView.setText(web[position]);

            imageView.setImageResource(Imageid[position]);

          } else {

            grid = (View) convertView;

          }

      return grid;

    }

}

 

MainActivity.java

public class MainActivity extends Activity {

  GridView grid;

  String[] web = {"Google","Github","Instagram","Facebook","Flickr","Pinterest",

      "Quora","Twitter","Vimeo","WordPress","Youtube","Stumbleupon","SoundCloud",

      "Reddit","Blogger"} ;

  int[] imageId = {R.drawable.image1,R.drawable.image2,R.drawable.image3,

      R.drawable.image4,R.drawable.image5,R.drawable.image6,R.drawable.image7,

      R.drawable.image8,R.drawable.image9,R.drawable.image10,R.drawable.image11,

      R.drawable.image12,R.drawable.image13,R.drawable.image14,R.drawable.image15};

  @Override

  protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    CustomGrid adapter = new CustomGrid(MainActivity.this, web, imageId);

    grid=(GridView)findViewById(R.id.grid);

        grid.setAdapter(adapter);

        grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override

                public void onItemClick(AdapterView<?> parent, View view,

                                        int position, long id) {

                    Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();

                }

            });

  }

}

 

 

 

 

 

 

 

Read more...

Example of DragEvent

Create new project named "DragEvent"

main.xml

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="2"
    android:columnWidth="300dp"
    android:orientation="vertical"
    android:rowCount="2"
    android:stretchMode="columnWidth" >

    <LinearLayout
        android:id="@+id/topleft"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="0"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/topright"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="1"
        android:layout_row="0"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomleft"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="0"
        android:layout_row="1"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/bottomright"
        android:layout_width="160dp"
        android:layout_height="200dp"
        android:layout_column="1"
        android:layout_row="1"
        android:background="@drawable/shape" >

        <ImageView
            android:id="@+id/myimage4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:src="@drawable/ic_launcher" />
    </LinearLayout> 

</GridLayout> 

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.myimage1).setOnTouchListener(new MyTouchListener());
        findViewById(R.id.myimage2).setOnTouchListener(new MyTouchListener());
        findViewById(R.id.myimage3).setOnTouchListener(new MyTouchListener());
        findViewById(R.id.myimage4).setOnTouchListener(new MyTouchListener());
        findViewById(R.id.topleft).setOnDragListener(new MyDragListener());
        findViewById(R.id.topright).setOnDragListener(new MyDragListener());
        findViewById(R.id.bottomleft).setOnDragListener(new MyDragListener());
        findViewById(R.id.bottomright).setOnDragListener(new MyDragListener());

      }

      private final class MyTouchListener implements OnTouchListener {
        public boolean onTouch(View view, MotionEvent motionEvent) {
          if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
            ClipData data = ClipData.newPlainText("", "");
            DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
            view.startDrag(data, shadowBuilder, view, 0);
            view.setVisibility(View.INVISIBLE);
            return true;
          } else {
            return false;
          }
        }
      }

      class MyDragListener implements OnDragListener {
        Drawable enterShape = getResources().getDrawable(R.drawable.shape_droptarget);
        Drawable normalShape = getResources().getDrawable(R.drawable.shape);

        @Override
        public boolean onDrag(View v, DragEvent event) {
          int action = event.getAction();
          switch (event.getAction()) {
          case DragEvent.ACTION_DRAG_STARTED:
            // do nothing
            break;
          case DragEvent.ACTION_DRAG_ENTERED:
            v.setBackgroundDrawable(enterShape);
            break;
          case DragEvent.ACTION_DRAG_EXITED:
            v.setBackgroundDrawable(normalShape);
            break;
          case DragEvent.ACTION_DROP:
            // Dropped, reassign View to ViewGroup
            View view = (View) event.getLocalState();
            ViewGroup owner = (ViewGroup) view.getParent();
            owner.removeView(view);
            LinearLayout container = (LinearLayout) v;
            container.addView(view);
            view.setVisibility(View.VISIBLE);
            break;
          case DragEvent.ACTION_DRAG_ENDED:
            v.setBackgroundDrawable(normalShape);
           
            default:
            break;
          }
          return true;
        }
      }
    }

Read more...

Animate TextView in Android Application

Create a new Project "AnimatedTextSample"

main.xml

Add a button to create animation text:

<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"
    tools:context="com.example.animatetextview.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="22dp"
        android:text="Animate" />

</RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      
        Button btn = (Button) findViewById(R.id.button1);
        final TextView textView = (TextView) findViewById(R.id.textView1);
      
        btn.setOnClickListener(new OnClickListener() {
          
            @Override
            public void onClick(View v) {
                textView.setText("Welcome to Android!");
                textView.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.slide_in_left));
            }
        });
    }

Read more...

“Counter” application demo

Create main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello"

        android:textSize="30dp"

        android:gravity="center"

        android:layout_gravity="center"/>

    <Button

        android:id="@+id/Add"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="30dp"

        android:text="Add"

        android:layout_gravity="center"/>

    <Button

        android:id="@+id/button2"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Substract"

        android:layout_marginTop="50dp"

        android:layout_gravity="center_horizontal"/>

</LinearLayout>

Create Main.java

package com.example.FirstProject;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class FirstProjectActivity extends Activity {

       int counter;

       Button add,sub;

       TextView display;

      

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              // TODO Auto-generated method stub

              super.onCreate(savedInstanceState);

              setContentView(R.layout.main);

      

        counter=0;

        add=(Button)findViewById(R.id.Add);

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

        display=(TextView)findViewById(R.string.hello);

      

        add.setOnClickListener(new OnClickListener() {

                           // TODO Auto-generated method stub

                           counter++;

                           display.setText("Total is: " + counter);

                     }

              });

        sub.setOnClickListener(new OnClickListener() {              

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                           counter--;

                           display.setText("Total is: " + counter);

                     }

              });

    }

   

}

Android Maiifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.prince.FirstProject"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name" >

        <activity

            android:label="@string/app_name"

            android:name=".FirstProjectActivity" >

            <intent-filter >

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Read more...