DDM 2022-10-25

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- para uma explicação sumária da SeekBar -->
    <TextView
        android:gravity="center_horizontal"
        android:id="@+id/idTvAbout"
        android:text="@string/strTvAbout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <!-- para sinalizar a probabilidade de obter-se
    uma mensagem "positiva" (quanto + para a direita
    mais provável uma mensagem positiva)
    Para lermos o valor da SeekBar, temos que consultar
    a propriedade de "progress"
    -->
    <SeekBar
        android:layout_below="@id/idTvAbout"
        android:id="@+id/idSbProb"
        android:max="100"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/idBtnGetMsg"
        android:text="@string/strBtnGetMsg"
        android:layout_below="@id/idSbProb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</RelativeLayout>

***************************************************+

<resources>
    <string name="app_name">Motivator</string>
    <string name="strTvAbout">Slide right, for positive msgs</string>
    <string name="strBtnGetMsg">Get Message!</string>
</resources>

*****************************************************

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Motivador</string>
    <string name="strTvAbout">Puxa p/direita, para frases positivas</string>
    <string name="strBtnGetMsg">Obter Mensagem!</string>
</resources>

*****************************************************


package com.joythis.android.motivator;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    //data members
    Context mContext;

    // for correspondence with whatever relevant in the layout
    TextView mTvAbout, mTvMsgs;
    SeekBar mSbProb; // the user picked probability (of a positive message)
    Button mBtnGetMsg;

    //behavior (click) handler
    View.OnClickListener mClickHandler =
    new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch(v.getId()){
                case R.id.idBtnGetMsg:
                    displayMsg();
                    break;
            }//switch
        }//onClick
    };//mClickHandler

    void displayMsg(){
        mTvMsgs.setText("There you are.");
    }//displayMsg

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        setContentView(R.layout.rl_motivator_v1);

        init();
    }//onCreate

    void init(){
        //inits
        mContext = this;
        mTvAbout = findViewById(R.id.idTvAbout);
        mSbProb = findViewById(R.id.idSbProb);
        mBtnGetMsg = findViewById(R.id.idBtnGetMsg);
        mTvMsgs = findViewById(R.id.idTvMsgs);

        //quality control

        //set behavior
        //associate mBtnGetMsg to some behavior handler
        mBtnGetMsg.setOnClickListener(
            mClickHandler
        );
    }//init
}//class MainActivity