Intent Explicit & Implicit

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="activity_horizontal_margin">10dp</dimen>
    <dimen name="activity_vertical_margin">10dp</dimen>
</resources>

<?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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Siapa Kamu?"></TextView>

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tv_1"
        android:layout_alignParentStart="true"
        android:layout_marginTop="20dp"
        android:text="Saya"></TextView>

    <EditText
        android:id="@+id/et_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@id/tv_name"
        android:layout_alignBottom="@id/tv_name"
        android:layout_alignParentEnd="true"
        android:layout_marginLeft="10dp"
        android:layout_toEndOf="@id/tv_name"
        android:ems="10"
        android:inputType="textPersonName"></EditText>

    <Button
        android:id="@+id/btn_send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_name"
        android:layout_marginTop="20dp"
        android:text="Kirim"></Button>

    <Button
        android:id="@+id/btn_browser"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn_send"
        android:text="Open Browser"></Button>

    <Button
        android:id="@+id/btn_darurat"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn_browser"
        android:text="Nomor Darurat"></Button>

</RelativeLayout>

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".Activity2">

    <TextView
        android:id="@+id/tv_hello"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="12dp"
        android:text="TextView"
        android:textSize="20sp"
        android:textStyle="bold"></TextView>

    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv_hello"
        android:layout_alignStart="@id/tv_hello"
        android:text="Ini Activity Kedua"></TextView>


</RelativeLayout>

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText et_name;
    Button btnSend, btnBrowser, btnDarurat;

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

        et_name = (EditText) findViewById( R.id.et_name );
        btnSend = (Button) findViewById( R.id.btn_send );
        btnBrowser = (Button) findViewById( R.id.btn_browser );
        btnDarurat = (Button) findViewById( R.id.btn_darurat );

        btnSend.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent( MainActivity.this, Activity2.class );
                i.putExtra( Activity2.KEY_NAME, et_name.getText().toString() );
                startActivity( i );
            }
        } );

        btnBrowser.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CallIntent( v );
            }
        } );

        btnDarurat.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CallIntent( v );
            }
        } );

    }

    public void CallIntent(View v) {
        Intent intent = null;
        switch (v.getId()) {
            case R.id.btn_browser:
                //Akan membuka Browser
                String url = "https://tootorial.tech.blog/";
                Intent browser = new Intent( Intent.ACTION_VIEW );
                browser.setData( Uri.parse( url ) );
                startActivity( browser );
                break;
            case R.id.btn_darurat:
                //Akan Melakukan Panggilan Kenomer darurat
                String nomor = "12345";
                Intent call = new Intent( Intent.ACTION_DIAL );
                call.setData(Uri.fromParts( "tel", nomor, null ));
                startActivity( call );
                break;
            default:
                break;
        }
    }
}

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class Activity2 extends AppCompatActivity {

    TextView txtHello;
    private String nama;
    public static String KEY_NAME = "nama";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_2 );

        txtHello = (TextView) findViewById( R.id.tv_hello );

        nama = getIntent().getStringExtra( KEY_NAME );
        txtHello.setText("Hello " + nama + " !" );

    }
}