HLessJon Tutorials

package com.mycompany.twoactivities;

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.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    //**20** because we need to use variables in more then on place declare them.
    //**20** Define input fields
    EditText editTextFirstName,editTextLastName;


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

        //**21** add get intent  from ActivityTwo.java
        //**21**  use the already existing TextView to display our message
        TextView display = (TextView) findViewById(R.id.primary);
        //**21** used printHere as the Intent variable
        Intent printHere = getIntent();
        //**21** put in the string object we passed assign to a string variable

        String name= printHere.getStringExtra("myReturnMessage");
        //**21** display the text if there is something there.
        //**21** if you dont use this if statement will still work but it just
        //**21** shows an ugly null message "Primary report: null "
        if(name != null){
        display.setText("Primary report: " + name);}


        editTextFirstName = (EditText) findViewById(R.id.editTextFirstName);
        editTextLastName = (EditText) findViewById(R.id.editTextLastName);
//**20**  buttonOne is only used here, so only declared here as a Button.
        Button buttonOne = (Button) findViewById(R.id.button1);
        // **20** assign buttonOne a listener
        buttonOne.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /***20** the manifest-file of our application and will display an
                Activity if it finds one with the same class. ie ActivityTwo.class**20** */
                Intent intent = new Intent(getApplicationContext(),ActivityTwo.class);
                //**20** "fname" and "lname" must be used again in ActivityTwo so remember them.
                //**20** Extract String objects with names fname and lname
                intent.putExtra("fname", editTextFirstName.getText().toString());
                intent.putExtra("lname", editTextLastName.getText().toString());

                /***20** the putExtra method is used it adds a key-value pair to the object.
                First parameter is key(name), the second - value.**20** */
//**20** we then send Intent using the startActivity method
                startActivity(intent);



            }
        });
    }
//    **19** Replaced this code with the new code
 /*   **19** buttonOne.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
//                notice ActivityTwo is what we want to start
                Intent intent = new Intent(getApplicationContext(),ActivityTwo.class);
//                use startActivity() to start the new activity described by the intent
                startActivity(intent);

            }}**19** */
   }