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Define own method






activity_main.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    tools:context="com.example.malik.blog.MainActivity">

    <Button
        android:id="@+id/buttonOne"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button One" />

    <Button
        android:id="@+id/buttonTwo"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button Two" />

    <Button
        android:id="@+id/buttonThree"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button Three" />

    <Button
        android:id="@+id/buttonFour"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button Four" />


</LinearLayout>




MainActivity.java


package com.example.malik.blog;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    Button one, two, three, four;

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

        myMethod();
    }

    public void myMethod() {
        one = (Button) findViewById(R.id.buttonOne);
        two = (Button) findViewById(R.id.buttonTwo);
        three = (Button) findViewById(R.id.buttonThree);
        four = (Button) findViewById(R.id.buttonFour);

        one.setOnClickListener(this);
        two.setOnClickListener(this);
        three.setOnClickListener(this);
        four.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.buttonOne:
                Toast.makeText(getApplicationContext(), "Button One", Toast.LENGTH_LONG).show();
                break;

            case R.id.buttonTwo:
                Toast.makeText(getApplicationContext(), "Button Two", Toast.LENGTH_LONG).show();
                break;

            case R.id.buttonThree:
                Toast.makeText(getApplicationContext(), "Button Three", Toast.LENGTH_LONG).show();
                break;

            case R.id.buttonFour:
                Toast.makeText(getApplicationContext(), "Button Four", Toast.LENGTH_LONG).show();
                break;
        }
    }
}



AndroidManifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.malik.blog">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>



build.gradle


apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.example.malik.blog"
        minSdkVersion 18
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}


dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}


User Help

If you want any source code or any other help just contact me at malik_himani@ymail.com. Your requirement's code will be uploaded in blog soon.