Log for Understanding Android Application Basics - 1

res = resource

AVD = Android Virtual Device

using default create project

=============================

package com.example.firstapp;

import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.util.Log;
import android.view.View;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static final String ACTIVITY_TAG="LogDemo";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //TextView textValue = (TextView) findViewById(R.id.textViewTest1);
        //textValue.getTex


        // Log.i("Create Android", "Test");

        // String stringValue = textValue.getText().toString();
        //int originalValue= Integer.parseInt(stringValue);
        //int newValue = MyWorker.doubleTheValue(originalValue);
        //int newValue = 10;
        //textValue.  .setText("ABC");

        FloatingActionButton fab = findViewById(R.id.fab);

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                TextView textValue = findViewById(R.id.textview_first);
                String stringValue = textValue.getText().toString();
                int originalValue= 1;
                if (stringValue != ""){
                    originalValue = Integer.parseInt(stringValue);
                }

                int newValue = MyWorker.doubleTheValue(originalValue);
                textValue.setText(Integer.toString(newValue));

                Snackbar.make(view, "Change value from " +  originalValue +  " to " + newValue , Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

      /*  fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Change value " +  " to " , Snackbar.LENGTH_LONG)
                        .setAction("Action", null).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.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);
    }
}

https://app.pluralsight.com/library/courses/android-application-basics-understanding/table-of-contents