Button Demo

Activity_main.java
===================


package com.example.mca.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

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

        btn_ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(), "OK Clicked", Toast.LENGTH_SHORT).show();
            }
        });


        ImageButton btn_img = (ImageButton) findViewById(R.id.btn_img);

        btn_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "Image Clicked", Toast.LENGTH_SHORT).show();
            }
        });

        final CheckBox btn_check = (CheckBox) findViewById(R.id.btn_check);

        btn_check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view)
            {
                if(btn_check.isChecked())
                    btn_check.setText("Unchecked Me");
                else
                    btn_check.setText("Checked Me");
            }
        });

        final TextView tv = (TextView) findViewById(R.id.textmsg);

        final RadioGroup group = (RadioGroup) findViewById(R.id.group);
        group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkedid) {
                RadioButton rb = (RadioButton) findViewById(checkedid);
                if(rb!=null)
                    tv.setText(rb.getText()+" is selected");
            }
        });

        Button btn_clear = (Button) findViewById(R.id.btn_clear);
        btn_clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                group.clearCheck();
                tv.setText("Choose an option");
            }
        });


        Button btn_click = (Button) findViewById(R.id.btn_click);
        btn_click.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(), "You Clicked", Toast.LENGTH_SHORT).show();
            }
        });
    }
}



===================
app\src\main\res\layout.xml
===================
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/activity_main"
    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.mca.myapplication.MainActivity">


    <Button
        android:text="OK"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:id="@+id/btn_ok" />

    <ToggleButton
        android:text="ToggleButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/btn_ok"
        android:layout_alignParentEnd="true"
        android:id="@+id/btn_toggle" />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@mipmap/ic_launcher"
        android:id="@+id/btn_img"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <CheckBox
        android:text="Checked Me"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_img"
        android:layout_alignParentStart="true"
        android:layout_marginTop="38dp"
        android:id="@+id/btn_check" />

    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentStart="true"
        android:id="@+id/group">

        <RadioButton
            android:text="Option 1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btn_check"
            android:layout_alignStart="@+id/btn_check"
            android:id="@+id/rdb1"
            android:layout_weight="1" />

        <RadioButton
            android:text="Option 2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btn_check"
            android:layout_alignEnd="@+id/chk_btn"
            android:id="@+id/rdb2"
            android:layout_weight="1" />

        <RadioButton
            android:text="Option 3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btn_check"
            android:layout_alignParentStart="true"
            android:id="@+id/rdb3"
            android:layout_weight="1" />

        <RadioButton
            android:text="Option 4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/chk_btn"
            android:layout_alignParentStart="true"

            android:id="@+id/rdb4"
            android:layout_weight="1" />
    </RadioGroup>

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_check"
        android:layout_alignParentEnd="true"
        android:id="@+id/textmsg" />

    <Button
        android:text="Clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textmsg"
        android:layout_alignParentEnd="true"
        android:id="@+id/btn_clear" />

    <Button
        android:text="Click me"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignStart="@+id/btn_img"
        android:id="@+id/btn_click" />


</RelativeLayout>