Summer REU Android Snippets

aaUsefulLinks

https://developer.android.com/   --> Developer Portal from Google -- Contains all documentation
https://material.io/tools/color/#!/?view.left=0&view.right=0   --> Material Colors for apps
https://material.io/    --> Design guidelines for Material Design
http://www.vogella.com/tutorials/android.html   --> Vogella Tutorials on Android
https://mindorks.com/blogs   --> Another great tutorial on Android
https://www.youtube.com/watch?v=hzrGAZnMOMQ&list=PLonJJ3BVjZW6hYgvtkaWvwAVvOFB7fkLa    --> Complete Android Tutorials --> Highly recommend --> Simplified and takes care of all the basics
https://codelabs.developers.google.com/?cat=Android   --> Android Codelabs from Google
https://www.udacity.com/courses/android   --> Android Courses on Udacity

Keep an eye out for Udacity Scholarships from Google for Android Development

People you could follow on Twitter who are involved with Android:
https://twitter.com/retomeier
https://twitter.com/RunChristinaRun
https://twitter.com/queencodemonkey
https://twitter.com/JakeWharton
https://twitter.com/AndroidDev
https://twitter.com/n8ebel
https://twitter.com/yashvprabhu
https://twitter.com/Eyal_Lezmy
https://twitter.com/KellyShuster
https://twitter.com/AdamMc331
https://twitter.com/alexjlockwood
https://twitter.com/MarkIAllison
https://twitter.com/yigitboyar

activity_answer.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    android:background="@color/backgroundColor"
    tools:context=".AnswerActivity">

    <TextView
        android:id="@+id/question_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:text="@string/question_hint"
        android:textColor="@color/fontColor"
        android:textSize="24sp"
        android:inputType="textCapSentences"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/answer_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="@string/question_hint"
        android:textColor="@color/fontColor"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/question_label" />

    <Button
        android:id="@+id/ask_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:onClick="askAgain"
        android:text="@string/ask_again"
        android:textSize="24sp"
        android:theme="@style/FlatButtonClear"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/answer_label" />
</android.support.constraint.ConstraintLayout>

activity_question.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:id="@+id/question_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/backgroundColor"
    tools:context=".QuestionActivity">

    <TextView
        android:id="@+id/welcome_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:text="@string/welcome_text"
        android:textColor="@color/fontColor"
        android:textSize="30sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.100000024" />

    <EditText
        android:id="@+id/question_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:hint="@string/question_hint"
        android:inputType="textMultiLine"
        android:textAlignment="center"
        android:textColor="@color/fontColor"
        android:textColorHint="@color/fontColor"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/welcome_text" />

    <Button
        android:id="@+id/clear_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:onClick="clearQuestion"
        android:text="@string/clear_button"
        android:textSize="24sp"
        android:theme="@style/FlatButtonClear"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/question_text" />

    <Button
        android:id="@+id/shake_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginTop="32dp"
        android:onClick="shakeEvent"
        android:text="@string/shake_button"
        android:textSize="24sp"
        android:theme="@style/FlatButtonShake"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/question_text" />
</android.support.constraint.ConstraintLayout>

AnswerActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import java.util.Random;

public class AnswerActivity extends AppCompatActivity {

    private static final String QUESTION_TEXT = "Question";
    private static final String ANSWER_TEXT = "Answer";
    private TextView questionText;
    private TextView answerText;
    private Random random;
    private String[] answers = {"It is certain",
            "It is decidedly so",
            "Without a doubt",
            "Yes definitely",
            "You may rely on it",
            "You can count on it",
            "As I see it, yes",
            "Most likely",
            "Outlook good",
            "Yes",
            "Signs point to yes",
            "Absolutely",
            "Reply hazy try again",
            "Ask again later",
            "Better not tell you now",
            "Cannot predict now",
            "Concentrate and ask again",
            "Don't count on it",
            "My reply is no",
            "My sources say no",
            "Outlook not so good",
            "Very doubtful",
            "Chances aren't good"};

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

        questionText = (TextView)findViewById(R.id.question_label);
        answerText = (TextView)findViewById(R.id.answer_label);
        random = new Random();
        Bundle myData = getIntent().getExtras();

        if (myData != null) {
            String question = myData.getString(QUESTION_TEXT);
            Log.d("Answer", "onCreate: " + question);
            if (question != null && question.length() == 0) {
                questionText.setText(getResources().getString(R.string.no_question));
                answerText.setText("????");
            } else {
                questionText.setText(question);
                int randomNumber = random.nextInt(answers.length - 1);
                answerText.setText(answers[randomNumber]);
                Animation animationFadeIn = AnimationUtils.loadAnimation(this,R.anim.fadein);
                answerText.startAnimation(animationFadeIn);
            }
        }

//        if (myData != null) {
//            String question = myData.getString(QUESTION_TEXT);
//            Log.d("Answer", "onCreate: " + question);
//            if (question != null && question.length() == 0) {
//                questionText.setText(getResources().getString(R.string.no_question));
//                answerText.setText("????");
//            } else {
//                questionText.setText(question);
//                if (savedInstanceState != null) {
//                    answerText.setText(savedInstanceState.getString(ANSWER_TEXT));
//                } else {
//                    int randomNumber = random.nextInt(answers.length - 1);
//                    answerText.setText(answers[randomNumber]);
//                }
//            }
//        }
    }

    public void askAgain(View view) {
        finish();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(ANSWER_TEXT, answerText.getText().toString());
    }
}

Array.java

private String[] answers = {"It is certain",
            "It is decidedly so",
            "Without a doubt",
            "Yes definitely",
            "You may rely on it",
            "You can count on it",
            "As I see it, yes",
            "Most likely",
            "Outlook good",
            "Yes",
            "Signs point to yes",
            "Absolutely",
            "Reply hazy try again",
            "Ask again later",
            "Better not tell you now",
            "Cannot predict now",
            "Concentrate and ask again",
            "Don't count on it",
            "My reply is no",
            "My sources say no",
            "Outlook not so good",
            "Very doubtful",
            "Chances aren't good"};

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#ffd54f</color>
    <color name="backgroundColor">#455a64</color>
    <color name="fontColor">#f5f5f5</color>
    <color name="clearColor">#4caf50</color>
    <color name="shakeColor">#42a5f5</color>
</resources>

CoreLogic.java

if (myData != null) {
  String question = myData.getString(QUESTION_TEXT);
  Log.d("Answer", "onCreate: " + question);
  if (question != null && question.length() == 0) {
    questionText.setText(getResources().getString(R.string.no_question));
    answerText.setText("????");
  } else {
    questionText.setText(question);
    int randomNumber = random.nextInt(answers.length - 1);
    answerText.setText(answers[randomNumber]);
  }
}

CoreLogicImproved.java

if (myData != null) {
  String question = myData.getString(QUESTION_TEXT);
  Log.d("Answer", "onCreate: " + question);
  if (question != null && question.length() == 0) {
    questionText.setText(getResources().getString(R.string.no_question));
    answerText.setText("????");
  } else {
    questionText.setText(question);
    if (savedInstanceState != null) {
      answerText.setText(savedInstanceState.getString(ANSWER_TEXT));
    } else {
      int randomNumber = random.nextInt(answers.length - 1);
      answerText.setText(answers[randomNumber]);
    }
  }
}

fadein.xml

<?xml version="1.0" encoding="utf-8"?>
<set android:interpolator="@android:anim/linear_interpolator" xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:duration="2000" android:fromAlpha="0.1" android:toAlpha="1.0" />
</set>

QuestionActivity.java

import android.content.Intent;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

public class QuestionActivity extends AppCompatActivity {

    private static final String QUESTION_TEXT = "Question";
    private EditText questionText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_question);
        questionText = (EditText) findViewById(R.id.question_text);
    }

    public void clearQuestion(View view) {
        if (questionText.getText() != null || questionText.getText().toString().contains(" ")) {
            questionText.setText("");
        }
    }

    public void shakeEvent(View view) {
        if (questionText.getText() != null && questionText.getText().toString().length() > 0) {
            Intent intent = new Intent(this, AnswerActivity.class);
            intent.putExtra(QUESTION_TEXT, questionText.getText().toString());
            startActivity(intent);
        }else {
            Snackbar.make(findViewById(R.id.shake_button), R.string.no_question, Snackbar.LENGTH_LONG).show();
        }
    }
}

strings.xml

<resources>
    <string name="app_name">Magic Eight Ball</string>
    <string name="welcome_text">Welcome to Eight Ball</string>
    <string name="shake_button">Shake</string>
    <string name="clear_button">Clear</string>
    <string name="question_hint">What is your question?</string>
    <string name="no_question">I cannot understand your question</string>
    <string name="ask_again">Ask Again</string>
</resources>

styles.xml

<style name="FlatButtonShake" parent="Theme.AppCompat.Light">
  <item name="android:buttonStyle">@style/Widget.AppCompat.Button.Colored</item>
  <item name="colorControlHighlight">@color/fontColor</item>
  <item name="colorAccent">@color/shakeColor</item>
</style>

<style name="FlatButtonClear" parent="Theme.AppCompat.Light">
  <item name="android:buttonStyle">@style/Widget.AppCompat.Button.Colored</item>
  <item name="colorControlHighlight">@color/fontColor</item>
  <item name="colorAccent">@color/clearColor</item>
</style>