How to add Toolbar In android Programming

Hello Friend's

now in android programming all is want advance technology like martial design  so i want to share how to add tool in activity ..

Main . xml

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

<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.kogta.androidadvance.MainActivity">


    <include        

android:id="@+id/app_bar"  

      layout="@layout/app_bar"/>

    <TextView       

 android:layout_below="@+id/app_bar"  

      android:layout_width="wrap_content"      

  android:layout_height="wrap_content"      

  android:text="Hello World!" />
</RelativeLayout>

create app_bar.xml file

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar 
xmlns:android="http://schemas.android.com/apk/res/android"  
  android:layout_width="match_parent"   
 android:layout_height="wrap_content"   
 android:background="#CCC">

</android.support.v7.widget.Toolbar>




java file

package com.example.kogta.androidadvance;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;


    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar=(Toolbar) findViewById(R.id.app_bar);
        setSupportActionBar(toolbar);
    }

    @Override    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.   
     getMenuInflater().inflate(R.menu.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();

        //noinspection SimplifiableIfStatement      
  if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Convert Centimeter to inches In android programming .

Hello Friend's . would i like to share today how to we can convert centimeter to inches in android programming .
first thing design part so first create new android studio project then go to main. xml class

and just copy that code

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

<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.kogta.imagesave.MainActivity">

    <TextView        

android:layout_width="wrap_content"   

     android:layout_height="wrap_content"  

      android:textAppearance="?android:attr/textAppearanceMedium"  

      android:text="Centimeter"       

 android:id="@+id/textView"       

 android:layout_alignParentTop="true"       

 android:layout_alignParentLeft="true"       

 android:layout_alignParentStart="true"       

 android:layout_marginTop="48dp" />

    <EditText       

 android:layout_width="wrap_content"     

   android:layout_height="wrap_content"     

   android:inputType="number"      

  android:ems="10"        

android:id="@+id/editText"   

     android:layout_alignBottom="@+id/textView"  

      android:layout_toRightOf="@+id/textView"  

      android:layout_toEndOf="@+id/textView"      

  android:layout_marginLeft="40dp"   

     android:layout_marginStart="40dp" />

    <TextView       

 android:layout_width="wrap_content"      

  android:layout_height="wrap_content"     

   android:textAppearance="?android:attr/textAppearanceMedium"    

    android:text=" Inches"        android:id="@+id/textView2"   

     android:layout_below="@+id/textView"       

 android:layout_alignParentLeft="true"   

     android:layout_alignParentStart="true"  

      android:layout_marginTop="40dp" />

    <EditText        

android:layout_width="wrap_content"   

     android:layout_height="wrap_content"  

      android:inputType="number"       

 android:ems="10"       

 android:id="@+id/editText2"   

     android:layout_alignBottom="@+id/textView2"

        android:layout_alignLeft="@+id/editText"    

    android:layout_alignStart="@+id/editText" />

    <Button

        android:layout_width="wrap_content" 

       android:layout_height="wrap_content"      

  android:text="Convert "       

 android:id="@+id/button"        

android:layout_centerVertical="true"      

  android:layout_centerHorizontal="true" />

</RelativeLayout>

then java code .------------->>>>>>>>>

package com.example.kogta.imagesave;


import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;



public class MainActivity extends AppCompatActivity {

//ImageView image;    @Override    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

//image=(ImageView)findViewById(R.id.image);

        final EditText editTextcenti=(EditText)findViewById(R.id.editText);

        final EditText editTextinch=(EditText)findViewById(R.id.editText2);

        Button button=(Button)findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {

            @Override            public void onClick(View v) {

                double centimeter=Double.valueOf( editTextcenti.getText().toString());

                double inches= centimeter * 0.393700787;

                editTextinch.setText(String.valueOf(inches));

            }
});



}

    }












the App is Done .Its so simple so just try it your self 

Android Bluetooth Printing with Actual Printer Device Example

 import android.app.Activity;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.bluetooth.BluetoothSocket;

import android.content.Intent;

import android.os.Bundle;

import android.os.Handler;

import android.view.View;

import android.widget.TextView;

import android.widget.EditText;

import android.widget.Button;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Set;

import java.util.UUID;

public class MainActivity extends Activity {

}

/ will show the statuses like bluetooth open, close or data sent

TextView myLabel;

// will enable user to enter any text to be printed

EditText myTextbox;

// android built in classes for bluetooth operations

BluetoothAdapter mBluetoothAdapter;

BluetoothSocket mmSocket;

BluetoothDevice mmDevice;

// needed for communication to bluetooth device / network

OutputStream mmOutputStream;

InputStream mmInputStream;

Thread workerThread;

byte[] readBuffer;

int readBufferPosition;

volatile boolean stopWorker;




@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    try {

        // more codes will be here

    }catch(Exception e) {

        e.printStackTrace();

    }

}







/ we are going to have three buttons for specific functions

Button openButton = (Button) findViewById(R.id.open);

Button sendButton = (Button) findViewById(R.id.send);

Button closeButton = (Button) findViewById(R.id.close);

// text label and input box

myLabel = (TextView) findViewById(R.id.label);

myTextbox = (EditText) findViewById(R.id.entry);




// open bluetooth connection

openButton.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {

        try {

            findBT();

            openBT();

        } catch (IOException ex) {

            ex.printStackTrace();

        }

    }

});




this will find a bluetooth printer device

void findBT() {

    try {

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        if(mBluetoothAdapter == null) {

            myLabel.setText("No bluetooth adapter available");

        }

        if(!mBluetoothAdapter.isEnabled()) {

            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

            startActivityForResult(enableBluetooth, 0);

        }

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

        if(pairedDevices.size() > 0) {

            for (BluetoothDevice device : pairedDevices) {

                 

                // RPP300 is the name of the bluetooth printer device

                // we got this name from the list of paired devices

                if (device.getName().equals("RPP300")) {

                    mmDevice = device;

                    break;

                }

            }

        }

        myLabel.setText("Bluetooth device found.");

    }catch(Exception e){

        e.printStackTrace();

    }

}