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Further guidance with a Spinner

after testing out examples given here and here, I thought I would be able to add a score-point if the user selected the correct drop-down item. (I'm making a simple quiz app that toasts the final score).
Obviously this is too advanced for me, but I really don't want to give up and wondered if anyone might have any idea as to what I'm doing wrong please?
Here is how I have it set out in the MainActivity.java, with my failed attempts of implementing a way of checking the selected item stripped out:
First I set out the questions:
package com.example.android.arabic;
import android.content.Intent;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.os.Bundle;
import android.util.Log;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
import com.example.android.arabic.Nature.Nature;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements OnItemSelectedListener{
int arabicScore = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// add emoji Q1
TextView q1 = findViewById(R.id.Q1_question);
q1.setText(Nature.HONEY_BEE);
// add emoji A2_option1
TextView qa2Option1 = findViewById(R.id.A2_option1);
qa2Option1.setText(Nature.GOAT);
// add emoji A2_option2
TextView qa2Option2 = findViewById(R.id.A2_option2);
qa2Option2.setText(Nature.BIRD);
// add emoji A2_option3
TextView qa2Option3 = findViewById(R.id.A2_option3);
qa2Option3.setText(Nature.HORSE);
//Q3 audio
Button q3Sound = this.findViewById(R.id.Q3_sound);
final MediaPlayer q3 = MediaPlayer.create(this, R.raw.camel);
q3Sound.setOnClickListener(new OnClickListener() {
public void onClick(View v) { q3.start();
}
});
// add emoji Q4_question
TextView q4 = findViewById(R.id.Q4_question);
q4.setText(Nature.ANT);
// Start of spinner Q4
Spinner a4 = findViewById(R.id.A4);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence>adapter = ArrayAdapter.createFromResource(this,
R.array.a4_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
a4.setAdapter(adapter);
a4.setOnItemSelectedListener(this);
//Q5 audio
Button q5Sound = this.findViewById(R.id.Q5_sound);
final MediaPlayer q5 = MediaPlayer.create(this, R.raw.cow_bird);
q5Sound.setOnClickListener(new OnClickListener() {
public void onClick(View v) { q5.start();
}
});
//A5
// add emoji A5_option1
TextView qa5Option1 = findViewById(R.id.A5_option1);
qa5Option1.setText(Nature.COW);
// add emoji A5_option2
TextView qa5Option2 = findViewById(R.id.A5_option2);
qa5Option2.setText(Nature.PIG);
// add emoji A5_option3
TextView qa5Option3 = findViewById(R.id.A5_option3);
qa5Option3.setText(Nature.SNAKE);
// add emoji A5_option4
TextView qa5Option4 = findViewById(R.id.A5_option4);
qa5Option4.setText(Nature.BIRD);
}
//Display Result
public void results(View view){
// Check point for Q1
EditText a1EditText = findViewById(R.id.A1);
String a1Entry = a1EditText.getText().toString();
if (a1Entry.contains("نحلة")) {
arabicScore = arabicScore + 1;
}
// Check point for Q2
RadioButton a2Radio = findViewById(R.id.A2_option2);
boolean isa2RadioChecked = a2Radio.isChecked();
if (isa2RadioChecked){
arabicScore = arabicScore + 1;
}
// Check point for Q3
EditText a3EditText = findViewById(R.id.A3);
String a3Entry = a3EditText.getText().toString();
if (a3Entry.contains("جمل")) {
arabicScore = arabicScore + 1;
}
// Check point for Q4
Toast resultToast = Toast.makeText(this, "You got " + arabicScore + " of 7 questions right.", Toast.LENGTH_LONG);
resultToast.show();
}
Preview of layout
}
Thank you very much for your advice in advance! I've been stuck on this for months! :'D

Java- hot to have just 1 button to toggle back and forth instead of two buttons?

I have 1 button for changing an image and a text.
I wanted to make that same button so that if I click AGAIN, it would change back to the original image and the text. However, 'TextView' and 'ImageView' in Java code would tell me, I have already defined. Therefore, I guess I can't re-define them within 1 button.
I ended up creating 2 buttons: 1 to change and 2nd one to return back. How can I just have one button to change and return images and text? HELP!
package com.example.android.cookies;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* Called when the cookie should be eaten.
*/
public void eatCookie(View view) {
// TODO: Find a reference to the ImageView in the layout. Change the image.
ImageView imageView = (ImageView)
findViewById(R.id.android_cookie_image_view);
imageView.setImageResource(R.drawable.after_cookie);
// TODO: Find a reference to the TextView in the layout. Change the text.
TextView textView = (TextView) findViewById(R.id.status_text_view);
textView.setText("Im so full");
}
public void returnCookie(View view) {
ImageView imageView = (ImageView)
findViewById(R.id.android_cookie_image_view);
imageView.setImageResource(R.drawable.before_cookie);
TextView textView = (TextView) findViewById(R.id.status_text_view);
textView.setText("I'm so hungry");
}
}
]2

I have written a well maintained code for you. You can save current state.
I don't recommend boolean. Because if you take int you can save more states in future, whereas in boolean you can save only two states- true or false.
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends Activity {
ImageView imageView;
TextView textView;
Button button;
final int STATE_HUNGRY = 1;
final int STATE_FULL = 2;
int currentState = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.android_cookie_image_view);
textView = (TextView) findViewById(R.id.status_text_view);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
switch (currentState) {
case STATE_FULL:
returnCookie();
break;
case STATE_HUNGRY:
eatCookie();
break;
default: // used when there is no state available
eatCookie();
}
}
});
}
public void eatCookie() {
currentState = STATE_FULL;
imageView.setImageResource(R.drawable.after_cookie);
textView.setText("Im so full");
}
public void returnCookie() {
currentState = STATE_HUNGRY;
imageView.setImageResource(R.drawable.before_cookie);
textView.setText("I'm so hungry");
}
}

Have you tried using a static variable to keep track of the currently displayed image? Static means it will maintain its state between function calls. Then toggle it each time the function is called. The initial declaration will only be called once.
static Boolean eaten = false;

My app will only output "false", not the code I want

I used samples from similar code to make this, unfortunately I'm not to sure what I did wrong.
The purpose of this app is to output text entered in a field to a TextView, where I changed the color, when a button is pressed.
package edu.wmich.project3
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class Main extends Activity {
String txtResult;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button text =(Button) findViewById(R.id.btnColor0);
final TextView result = ((TextView) findViewById(R.id.txtResult));
text.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
txtResult= getText(R.id.txtField0).toString();
result.setText(txtResult);
}
});
}
}

txtResult = (findViewById(R.id.txtField0)).toString();
will solve...
the problem is that you're using the method getText() from the Activity which has nothing to do with the TextField you're dealing with.
...what is the type of view of R.id.txtField0? I guess with this you can take it from here.

dynamic array of LinearLayout

This is a simpler version of something I'm working on. When the add button is pressed, what is supposed to happen is, a LinearLayout is created and a CheckBox is also created with the text within the EditText box. The CheckBox is then placed into the newly created LinearLayout, and the newly created LinearLayout, placed in the already existing LinearLayout(named layout). I know it seems unnecessary to create a new LinearLayout but in the main program, its really important. My problem is, when I run the code, the app 'force closes' so I want to know what it is that I'm doing wrong or if there is a better approach I can take to achieve the result I need.
package co.cc.*******.toDo;
import co.cc.*******.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class ToDoMainActivity extends Activity implements View.OnClickListener{
/** Called when the activity is first created. */
Button bAdd,bremove;
EditText et;
// CheckBox cbNew;
LinearLayout layout;//main layout
ArrayList<CheckBox> cbNew;//dynamic array of checkBoxes
ArrayList<LinearLayout> cbLayout;//dynamic array of LinearLayouts
int index = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initialize();
bAdd.setOnClickListener(this);
bremove.setOnClickListener(this);
}//end method onCreate
void initialize(){
bAdd = (Button)findViewById(R.id.bAdd);
bremove = (Button)findViewById(R.id.bremove);
et = (EditText)findViewById(R.id.et);
layout = (LinearLayout)findViewById(R.id.layout);
cbNew = new ArrayList<CheckBox>();
}//end method initialize
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.bAdd:
cbLayout.add(index, new LinearLayout(this));//create new layout to store cb
cbNew.add(index, new CheckBox(this));//create new checkbox
cbNew.get(index).setText(et.getText().toString()+ index);//set text to text in editText box
cbLayout.get(index).addView(cbNew.get(index));//add checkbox to newly created layout
layout.addView(cbLayout.get(index));//add newly created layout to already existing layout
index ++;
break;
}//end switch
//layout.removeView(cbNew.get(index));
}//end method onClick
}//end class ToDoMainActivity

Android scrollview not displaying strings

The following class is intended to display a set of strings contained in an xml file. Within the onCreate method, an array of strings is pulled from a resource file. These strings are a set of corny jokes that are added to an ArrayList of Joke objects (m_arrJokeList), constructed from the strings.
The addJoke method, called within the onCreate method, is intended to display these jokes in a scroll view as text. However, none of this seems to work on either my device or emulator, so something is definitely wrong with the code. I'd like to know how I can fix this as well on some tips on how to work with these views.
Here is the code, not fully implemented.
package edu.calpoly.android.lab2;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
public class SimpleJokeList extends Activity {
// Contains the list Jokes the Activity will present to the user
protected ArrayList<Joke> m_arrJokeList;
// LinearLayout used for maintaining a list of Views that each display Jokes
protected LinearLayout m_vwJokeLayout;
// EditText used for entering text for a new Joke to be added to m_arrJokeList.
protected EditText m_vwJokeEditText;
// Button used for creating and adding a new Joke to m_arrJokeList using the
// text entered in m_vwJokeEditText.
protected Button m_vwJokeButton;
// Background Color values used for alternating between light and dark rows
// of Jokes.
protected int m_nDarkColor;
protected int m_nLightColor;
#Override
public void onCreate(Bundle savedInstance) {
super.onCreate(savedInstance);
initLayout();
Resources localRsrc;
localRsrc = this.getResources();
ArrayList<Joke> jokeList = new ArrayList<Joke>();
String[] jokeStrings = localRsrc.getStringArray(R.array.jokeList);
int size = jokeStrings.length;
Joke tempJoke = new Joke();
for(int i=0;i < size;i++)
{
tempJoke.setJoke(jokeStrings[i]);
jokeList.add(tempJoke);
addJoke(tempJoke);
}
}
// Method used to encapsulate the code that initializes and sets the Layout
// for this Activity.
protected void initLayout() {
// TODO
//LinearLayout rootLayout;
m_arrJokeList = new ArrayList<Joke>();
m_vwJokeLayout = new LinearLayout(this); // why pass "this"
m_vwJokeLayout.setOrientation(LinearLayout.VERTICAL);
ScrollView extendedView = new ScrollView(this.getApplicationContext());
extendedView.addView(m_vwJokeLayout);
setContentView(extendedView);
}
// Method used to encapsulate the code that initializes and sets the Event
// Listeners which will respond to requests to "Add" a new Joke to the list.
protected void initAddJokeListeners() {
// TODO
}
// Method used for encapsulating the logic necessary to properly initialize
// a new joke, add it to m_arrJokeList, and display it on screen.
// #param strJoke
// A string containing the text of the Joke to add.
protected void addJoke(Joke jk) {
m_arrJokeList.add(jk);
TextView textJoke = new TextView(this);
textJoke.setText(jk.getJoke());
m_vwJokeLayout.addView(textJoke);
}
}

put
Joke tempJoke = new Joke();
in for loop
for(int i=0;i < size;i++)
{
Joke tempJoke = new Joke();
tempJoke.setJoke(jokeStrings[i]);
jokeList.add(tempJoke);
addJoke(tempJoke);
}
then try it. and let me know what happen.