Stupid Android

MainActivity.java

package com.example.sengx.intentdemo;

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

public class MainActivity extends Activity implements View.OnClickListener {

    Button btnNext;
    Button btnDial;
    EditText edtDialNum;
    TextView tvResult;

    // 1. ສ້າງໂຕ request code
    public static final int REQUEST_CODE = 1;

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

        btnNext = (Button) findViewById(R.id.btnNext);
        btnNext.setOnClickListener(this);

        btnDial = (Button) findViewById(R.id.btnDial);
        btnDial.setOnClickListener(this);

        edtDialNum = (EditText) findViewById(R.id.edtDialNum);

        tvResult = (TextView) findViewById(R.id.tvResult);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
//            case(R.layout.activity_second):
            // 4. ກວດຄືນໂຕ request code ແມ່ນໂຕດຽວກັນບໍ່
            case REQUEST_CODE:
                // 5. ເອົາໂຕນີ້ອອກຈຶ່ວໄດ້, ສົງໄສ resultCode ບໍ່ກົງກັນ
//                if(resultCode == Activity.RESULT_OK){
                    String resultValue = data.getStringExtra("resultAnimal");
                    tvResult.setText(resultValue);
//                }
                break;
            default:
                break;
        }
    }

    @Override
    public void onClick(View v) {
        int WidgetID = v.getId();
        switch(WidgetID){
            case R.id.btnNext:
                Intent intent = new Intent(getApplicationContext(),SecondActivity.class);
                startActivity(intent);
                break;
            case R.id.btnDial:
                String number = edtDialNum.getText().toString().trim();
                Intent call = new Intent(getApplicationContext(), SecondActivity.class);
                call.putExtra("message", number);
//                startActivity(call);
                // 2. ໃຊ້ startActivityForResult ແທນມ ໃສ່ REQUEST ເຂົ້າໄປນຳ
                startActivityForResult(call, REQUEST_CODE);


//                String tel = edtDialNum.getText().toString().trim();
//                Intent intentDial = new Intent(Intent.ACTION_DIAL);
//                intentDial.setData(Uri.parse("tel:"+tel));
//                startActivity(intentDial);
                break;
        }
    }
}

SecondActivity.java

package com.example.sengx.intentdemo;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class SecondActivity extends Activity implements View.OnClickListener {

    Button btnBack;
    RadioGroup rdgAnimal;
    RadioButton rdAnimal;

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

        btnBack = (Button) findViewById(R.id.btnBack);
        btnBack.setOnClickListener(this);

        rdgAnimal = (RadioGroup)findViewById(R.id.rdgAnimal);

        Bundle bundle = getIntent().getExtras();
        Toast.makeText(this, bundle.getString("message").toString(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onClick(View v) {
        int WidgetID = v.getId();

        switch (WidgetID){
            case R.id.btnBack:
                int selectedId = rdgAnimal.getCheckedRadioButtonId();
                rdAnimal = (RadioButton) findViewById(selectedId);
                Toast.makeText(this, rdAnimal.getText().toString(), Toast.LENGTH_SHORT).show();
                Intent resultIntent = new Intent();
                resultIntent.putExtra("resultAnimal", rdAnimal.getText().toString());
//                setResult(Activity.RESULT_OK, resultIntent);
                // 3. setResult ພ້ອມໃສ່ request code ກັບຄືນ
                setResult(MainActivity.REQUEST_CODE, resultIntent);

                finish();
                break;
            default:
                break;
        }
    }
}