DDM 2022-11-29

<?xml version="1.0" encoding="utf-8"?>
<!-- activity_a2.xml -->
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".A2">

    <EditText
        android:gravity="center_horizontal"
        android:hint="yyyy-mm-dd"
        android:id="@+id/idEtResult"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/idBtnConfirm"
        android:text="@string/strBtnConfirm"
        app:layout_constraintTop_toBottomOf="@id/idEtResult"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        app:layout_constraintTop_toBottomOf="@id/idBtnConfirm"
        android:id="@+id/idBtnCancel"
        android:text="@string/strBtnCancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</androidx.constraintlayout.widget.ConstraintLayout>

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

<?xml version="1.0" encoding="utf-8"?>
<!-- activity_main.xml -->
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <LinearLayout
        android:orientation="horizontal"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:gravity="center_horizontal"
            android:text="@string/strTvResult"
            android:id="@+id/idTvResult"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <Button
            android:id="@+id/idBtnGetResult"
            android:text="@string/strBtnGetResult"
            android:layout_weight="2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

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


<!-- strings.xml -->
<resources>
    <string name="app_name">SAFR</string>
    <string name="strBtnGetResult">get result</string>
    <string name="strTvResult">result will appear here</string>
    <string name="strBtnConfirm">confirm result</string>
    <string name="strBtnCancel">cancel result</string>
</resources>

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

//MainActivity.java
package com.joythis.android.safr;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public final static int
    CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY = 4321;

    public final static String KEY_RESPONSE = "KEY_REPONSE";

    Activity mA;
    TextView mTvResult;
    Button mBtnGetResult;

    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch(v.getId()){
                case R.id.idBtnGetResult:
                    actionGetResult_retro();
                    break;
            }//switch
        }//onClick
    };//mClickHandler

    void actionGetResult_retro(){
        Intent goA2 = new Intent(
            MainActivity.this,
            A2.class
        );
        //startActivity(goA2);
        //1 - old SAFR
        startActivityForResult(
            goA2,
            CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY
        );
    }//actionGetResult_retro

    //2 - old SAFR
    /*
    este método será AUTOMATICAMENTE chamado pelo
    sistema Android, quando uma Activity qualquer
    tenha uma resposta para esta Activity em que
    estamos
     */
    @Override
    protected void onActivityResult(
        int requestCode, // para diferenciar entre pedidos
        int resultCode, // OK ou CANCELLED
        @Nullable Intent data // poderá haver dados na resposta
    )
    {
        super.onActivityResult(requestCode, resultCode, data);

        boolean bShouldIRespond = requestCode ==
            CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY;
        if(bShouldIRespond){
            boolean bConfirmed = resultCode == this.RESULT_OK;
            boolean bCanceled = resultCode == this.RESULT_CANCELED;
            if (bConfirmed){
                // TODO : coisas a fazer com os dados respondidos
                if(data!=null) { // há dados?
                    // se sim, aceder por chaves
                    String theResponse =
                            data.getStringExtra(KEY_RESPONSE);

                    mTvResult.setText(theResponse);
                }
            }
            else{
                mTvResult.setText("result canceled");
            }
        }//if
    }

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

        init();
    }//onCreate

    void init(){
        //1 - assocs
        mA = this;
        mTvResult = findViewById(R.id.idTvResult);
        mBtnGetResult = findViewById(R.id.idBtnGetResult);

        //2 - behaviors
        mBtnGetResult.setOnClickListener(mClickHandler);
    }//init
}//MainActivity

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

//A2.java
package com.joythis.android.safr;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class A2 extends AppCompatActivity {
    Activity mA;
    EditText mEtResult;
    Button mBtnConfirm, mBtnCancel;

    View.OnClickListener mClickHandler=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch(v.getId()){
                case R.id.idBtnConfirm:
                    actionConfirm();
                    break;
                case R.id.idBtnCancel:
                    actionCancel();
                    break;
            }//switch
        }
    };//mClickHandler

    void actionConfirm(){
        String theData =
            mEtResult.getText().toString().trim();

        Intent toTransportTheResult = new Intent();

        toTransportTheResult.putExtra(
            MainActivity.KEY_RESPONSE,
            theData
        );

        this.setResult(
            RESULT_OK,
            toTransportTheResult
        );
        finish();
    }//actionConfirm


    void actionCancel(){
        this.setResult(RESULT_CANCELED);
        finish();
    }//actionCancel

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_a2);
        init();
    }//onCreate

    void init(){
        //1 - assocs
        mA = this;
        mEtResult = findViewById(R.id.idEtResult);
        mBtnConfirm = findViewById(R.id.idBtnConfirm);
        mBtnCancel = findViewById(R.id.idBtnCancel);

        //2 - behaviors
        mBtnConfirm.setOnClickListener(mClickHandler);
        mBtnCancel.setOnClickListener(mClickHandler);
    }
}//A2


******


//MainActivity.java
package com.joythis.android.safr;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContract;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityOptionsCompat;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public final static int
    CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY = 4321;

    public final static String KEY_RESPONSE = "KEY_REPONSE";

    Activity mA;
    TextView mTvResult;
    Button mBtnGetResult;

    // modern SAFR start
    //1
    ActivityResultContract safrContract = new
            ActivityResultContracts.StartActivityForResult();

    //2
    ActivityResultCallback<ActivityResult> safrCallback =
        new ActivityResultCallback<ActivityResult>() {
        @Override
        public void onActivityResult(ActivityResult result) {
            if(result!=null){
                boolean bCanceled = result.getResultCode()==RESULT_CANCELED;
                boolean bConfirm = result.getResultCode()==RESULT_OK;
                if(bConfirm){
                    Intent theData = result.getData();
                    if(theData!=null){
                        String theResult =
                            theData.getStringExtra(KEY_RESPONSE);

                        mTvResult.setText(theResult);
                    }//if
                }//if bConfirm
                if(bCanceled){
                    mTvResult.setText("result canceled");
                }
            }//if
        }//onActivityResult
    };//safrCallback

    //3
    ActivityResultLauncher<Intent> safrLauncher = registerForActivityResult(
        safrContract,
        safrCallback
    );
    // modern SAFR end


    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch(v.getId()){
                case R.id.idBtnGetResult:
                    //actionGetResult_retro();
                    actionGetResult_modern();
                    break;
            }//switch
        }//onClick
    };//mClickHandler

    void actionGetResult_retro(){
        Intent goA2 = new Intent(
            MainActivity.this,
            A2.class
        );
        //startActivity(goA2);
        //1 - old SAFR
        startActivityForResult(
            goA2,
            CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY
        );
    }//actionGetResult_retro

    void actionGetResult_modern(){
        Intent goA2 = new Intent(
                MainActivity.this,
                A2.class
        );
        // TODO
    }//actionGetResult_modern

    //2 - old SAFR
    /*
    este método será AUTOMATICAMENTE chamado pelo
    sistema Android, quando uma Activity qualquer
    tenha uma resposta para esta Activity em que
    estamos
     */
    @Override
    protected void onActivityResult(
        int requestCode, // para diferenciar entre pedidos
        int resultCode, // OK ou CANCELLED
        @Nullable Intent data // poderá haver dados na resposta
    )
    {
        super.onActivityResult(requestCode, resultCode, data);

        boolean bShouldIRespond = requestCode ==
            CALL_THIS_NUMBER_WHEN_RESULT_FROM_A2_IS_READY;
        if(bShouldIRespond){
            boolean bConfirmed = resultCode == this.RESULT_OK;
            boolean bCanceled = resultCode == this.RESULT_CANCELED;
            if (bConfirmed){
                // TODO : coisas a fazer com os dados respondidos
                if(data!=null) { // há dados?
                    // se sim, aceder por chaves
                    String theResponse =
                            data.getStringExtra(KEY_RESPONSE);

                    mTvResult.setText(theResponse);
                }
            }
            else{
                mTvResult.setText("result canceled");
            }
        }//if
    }

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

        init();
    }//onCreate

    void init(){
        //1 - assocs
        mA = this;
        mTvResult = findViewById(R.id.idTvResult);
        mBtnGetResult = findViewById(R.id.idBtnGetResult);

        //2 - behaviors
        mBtnGetResult.setOnClickListener(mClickHandler);
    }//init
}//MainActivity
*********************************
<?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">

    <LinearLayout
        android:id="@+id/idLlLabels"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:gravity="center_horizontal"
            android:text="@string/strTVDate1"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <TextView
            android:gravity="center_horizontal"
            android:text="@string/strTVDate2"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:layout_below="@id/idLlLabels"
        android:id="@+id/idLlDates"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <LinearLayout
            android:orientation="horizontal"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <EditText
                android:id="@+id/idEtDate1"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
            <Button
                android:id="@+id/idBtnPickDate1"
                android:text="@string/strBtnPickDate1"
                android:layout_weight="2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
        <LinearLayout
            android:orientation="horizontal"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <EditText
                android:layout_weight="1"
                android:id="@+id/idEtDate2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
            <Button
                android:layout_weight="2"
                android:id="@+id/idBtnPickDate2"
                android:text="@string/strBtnPickDate2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
    </LinearLayout>

    <Button
        android:layout_below="@id/idLlDates"
        android:id="@+id/idBtnComputeDistance"
        android:text="@string/strBtnComputeDistance"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <ListView
        android:layout_below="@id/idBtnComputeDistance"
        android:id="@+id/idLvDistances"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

*********

<?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">

    <LinearLayout
        android:id="@+id/idLlLabels"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_weight="1"
            android:text="@string/strTvYear"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <TextView
            android:layout_weight="1"
            android:text="@string/strTvMonth"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <TextView
            android:layout_weight="1"
            android:text="@string/strTvDay"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/idLlInputs"
        android:layout_below="@id/idLlLabels"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <NumberPicker
            android:layout_weight="1"
            android:id="@+id/idNpYear"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <NumberPicker
            android:layout_weight="1"
            android:id="@+id/idNpMonth"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <NumberPicker
            android:layout_weight="1"
            android:id="@+id/idNpDay"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</RelativeLayout>