V1
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eb6c30f3cd
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c62b6123d5
@ -8,79 +8,159 @@ import androidx.appcompat.app.AppCompatActivity;
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import androidx.databinding.BaseObservable;
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import androidx.databinding.Bindable;
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public class FractionCalculator extends BaseObservable{
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import java.security.InvalidParameterException;
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public class FractionCalculator extends BaseObservable{
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// Debugging stuff
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private static final String TAG = FractionCalculator.class.getName();
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private String denomLeft;
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private String enumLeft;
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private String denomRight;
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private String enumRight;
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private String denomResult;
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private String enumResult;
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public enum ARTIH {ADD, SUBTRACT, MULTIPLICATE, DIVIDE};
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private ARTIH arithMethod;
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private String centerSign;
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private int denomLeft;
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private int enumLeft;
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private int denomRight;
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private int enumRight;
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private int denomResult;
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private int enumResult;
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public FractionCalculator(){
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Log.d(TAG, "new FractionCalculator created");
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}
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/// #### GETTER AND SETTER ####
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// Calculate the result
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// https://de.wikibooks.org/wiki/C%2B%2B-Programmierung/_Br%C3%BCche
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public void calculateResult(){
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if(denomLeft == 0 || denomRight == 0){
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Log.e(TAG, "Denominator cannot be 0");
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} else {
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switch (arithMethod) {
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case ADD:
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denomResult = getLCM(denomLeft, denomRight);
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enumResult = enumLeft * (denomResult / denomLeft) + enumRight * (denomResult / denomRight);
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break;
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case SUBTRACT:
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denomResult = getLCM(denomLeft, denomRight);
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enumResult = enumLeft * (denomResult / denomLeft) - enumRight * (denomResult / denomRight);
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break;
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case MULTIPLICATE:
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denomResult = denomLeft * denomRight;
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enumResult = enumLeft * enumRight;
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break;
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case DIVIDE:
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enumResult = enumLeft * denomRight;
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denomResult = denomLeft * enumRight;
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break;
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}
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// update the result variables
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notifyPropertyChanged(BR.denomResult);
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notifyPropertyChanged(BR.enumResult);
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}
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}
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// ####### HELPER METHODS #######
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// calculate greatest common divisor (Euclidean algorithm)
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private int getGCD(int a, int b){
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if(b==0){
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return a;
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} else {
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return getGCD(b,a % b);
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}
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}
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// calculate least common multiple
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private int getLCM(int a, int b){
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return (a*b)/getGCD(a,b);
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}
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// ####### END HELPER METHODS #######
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/// ####### GETTER AND SETTER #######
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public void setArithMethod(ARTIH arithMethod) {
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this.arithMethod = arithMethod;
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switch(arithMethod){
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case ADD:
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centerSign = "+";
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break;
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case SUBTRACT:
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centerSign = "-";
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break;
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case MULTIPLICATE:
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centerSign = "*";
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break;
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case DIVIDE:
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centerSign = "/";
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break;
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}
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// Update the sign in the middle of the screen
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notifyPropertyChanged(BR.centerSign);
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}
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@Bindable
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public String getDenomLeft() {
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public int getDenomLeft() {
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return denomLeft;
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}
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public void setDenomLeft(String denomLeft) {
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public void setDenomLeft(int denomLeft) {
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this.denomLeft = denomLeft;
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notifyPropertyChanged(BR.denomLeft);
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}
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@Bindable
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public String getEnumLeft() {
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public int getEnumLeft() {
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return enumLeft;
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}
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public void setEnumLeft(String enumLeft) {
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public void setEnumLeft(int enumLeft) {
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this.enumLeft = enumLeft;
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notifyPropertyChanged(BR.enumLeft);
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}
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@Bindable
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public String getDenomRight() {
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public int getDenomRight() {
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return denomRight;
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}
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public void setDenomRight(String denomRight) {
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public void setDenomRight(int denomRight) {
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this.denomRight = denomRight;
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notifyPropertyChanged(BR.denomRight);
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}
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@Bindable
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public String getEnumRight() {
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public int getEnumRight() {
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return enumRight;
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}
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public void setEnumRight(String enumRight) {
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public void setEnumRight(int enumRight) {
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this.enumRight = enumRight;
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notifyPropertyChanged(BR.enumRight);
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}
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@Bindable
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public String getDenomResult() {
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public int getDenomResult() {
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return denomResult;
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}
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public void setDenomResult(String denomResult) {
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public void setDenomResult(int denomResult) {
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this.denomResult = denomResult;
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notifyPropertyChanged(BR.denomResult);
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}
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@Bindable
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public String getEnumResult() {
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public int getEnumResult() {
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return enumResult;
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}
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public void setEnumResult(String enumResult) {
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public void setEnumResult(int enumResult) {
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this.enumResult = enumResult;
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notifyPropertyChanged(BR.enumResult);
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}
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@Bindable
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public String getCenterSign() {
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return centerSign;
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}
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/// ####### END GETTER AND SETTER #######
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}
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@ -1,5 +1,6 @@
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package io.n0x.android.java_mot_testing;
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import android.annotation.SuppressLint;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.View;
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@ -16,6 +17,8 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
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// Local calculator instance
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private FractionCalculator calc;
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private int test;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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@ -23,8 +26,8 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
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calc = new FractionCalculator();
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// set a value for testing
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calc.setEnumResult("0");
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calc.setDenomResult("0");
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calc.setEnumResult(0);
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calc.setDenomResult(0);
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// Bind instance of FractionCalculator to view
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Ex9DataBindingBinding binding = DataBindingUtil.setContentView(this, R.layout.ex9_data_binding);
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@ -32,21 +35,34 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
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// Button Listeners
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findViewById(R.id.button_add).setOnClickListener(this);
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findViewById(R.id.button_sub).setOnClickListener(this);
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findViewById(R.id.button_mult).setOnClickListener(this);
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findViewById(R.id.button_div).setOnClickListener(this);
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findViewById(R.id.button_calc).setOnClickListener(this);
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// Log create action
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Log.d(TAG, "MainActivity started");
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}
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@SuppressLint("NonConstantResourceId")
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@Override
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public void onClick(View v) {
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if (v.getId() == R.id.button_add) {
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// works (without using bindings)
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TextView textView = findViewById(R.id.txt_enum_result);
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textView.setText("1234");
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// work with DataBinding
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calc.setDenomLeft("123123123");
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switch(v.getId()){
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case R.id.button_add:
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calc.setArithMethod(FractionCalculator.ARTIH.ADD);
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break;
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case R.id.button_sub:
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calc.setArithMethod(FractionCalculator.ARTIH.SUBTRACT);
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break;
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case R.id.button_mult:
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calc.setArithMethod(FractionCalculator.ARTIH.MULTIPLICATE);
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break;
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case R.id.button_div:
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calc.setArithMethod(FractionCalculator.ARTIH.DIVIDE);
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break;
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case R.id.button_calc:
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calc.calculateResult();
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break;
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}
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}
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}
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@ -15,131 +15,148 @@
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<Button
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android:id="@+id/button_add"
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android:layout_width="wrap_content"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginStart="8dp"
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android:layout_marginTop="152dp"
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android:layout_marginEnd="8dp"
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android:text="+"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintEnd_toStartOf="@+id/button_sub"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/button_sub"
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android:layout_width="wrap_content"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginTop="152dp"
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android:layout_marginEnd="8dp"
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android:text="-"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/button_add" />
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app:layout_constraintEnd_toStartOf="@+id/button_mult"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/button_mult"
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android:layout_width="wrap_content"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginTop="152dp"
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android:layout_marginEnd="8dp"
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android:text="*"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/button_sub" />
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app:layout_constraintEnd_toStartOf="@+id/button_div"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/button_div"
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android:layout_width="wrap_content"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginTop="152dp"
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android:layout_marginEnd="8dp"
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android:text="/"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintHorizontal_bias="0.501"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/button_mult" />
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<TextView
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android:id="@+id/txt_equals"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="60dp"
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android:text="="
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android:textSize="34sp"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintHorizontal_bias="0.181"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/button_div" />
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app:layout_constraintTop_toTopOf="parent" />
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<TextView
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android:id="@+id/txt_enum_result"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="64dp"
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android:text="@{calc.enumResult}"
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android:layout_marginTop="16dp"
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android:text="@{String.valueOf(calc.enumResult)}"
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android:textAlignment="center"
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android:textSize="34sp"
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app:layout_constraintBottom_toTopOf="@+id/txt_denom_result"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/button_div" />
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app:layout_constraintTop_toBottomOf="@+id/button_mult" />
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<TextView
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android:id="@+id/txt_denom_result"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="3dp"
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android:layout_marginBottom="412dp"
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android:text="@{calc.denomResult}"
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android:text="@{String.valueOf(calc.denomResult)}"
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android:textAlignment="center"
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android:textSize="34sp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintHorizontal_bias="0.501"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/txt_enum_result" />
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<EditText
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android:text="@{calc.enumRight}"
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android:id="@+id/enumRight"
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android:layout_width="140dp"
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android:layout_height="50dp"
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android:layout_marginTop="32dp"
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android:layout_marginTop="16dp"
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android:layout_marginEnd="16dp"
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android:ems="10"
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android:gravity="center_horizontal"
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android:hint="Zähler"
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android:inputType="numberSigned"
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android:text="@={`` + calc.enumRight}"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toEndOf="@+id/button_add"
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app:layout_constraintTop_toTopOf="parent" />
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<EditText
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android:text="@{calc.enumRight}"
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android:id="@+id/enumLeft"
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android:layout_width="140dp"
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android:layout_height="50dp"
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android:layout_marginTop="32dp"
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android:layout_marginStart="16dp"
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android:layout_marginTop="16dp"
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android:ems="10"
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android:gravity="center_horizontal"
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android:hint="Zähler"
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android:inputType="numberSigned"
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app:layout_constraintEnd_toStartOf="@+id/button_add"
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android:text="@={`` + calc.enumLeft}"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<EditText
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android:text="@{calc.denomLeft}"
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android:id="@+id/denomLeft"
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android:layout_width="140dp"
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android:layout_height="50dp"
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android:layout_marginTop="32dp"
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android:layout_marginStart="16dp"
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android:layout_marginTop="16dp"
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android:ems="10"
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android:gravity="center_horizontal"
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android:hint="Nenner"
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android:inputType="number"
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app:layout_constraintEnd_toStartOf="@+id/button_mult"
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android:text="@={`` + calc.denomLeft}"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@+id/enumLeft" />
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<EditText
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android:text="@{calc.denomRight}"
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android:id="@+id/denomRight"
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android:layout_width="140dp"
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android:layout_height="50dp"
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android:layout_marginTop="32dp"
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android:layout_marginTop="16dp"
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android:layout_marginEnd="16dp"
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android:ems="10"
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android:gravity="center_horizontal"
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android:hint="Nenner"
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android:inputType="number"
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android:text="@={`` + calc.denomRight}"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toEndOf="@+id/button_mult"
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app:layout_constraintTop_toBottomOf="@+id/enumRight" />
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<Button
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android:id="@+id/button_calc"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginStart="8dp"
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android:layout_marginTop="236dp"
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android:text="="
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<TextView
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android:id="@+id/centerSign"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:gravity="center"
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android:text="@{calc.centerSign}"
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android:textAlignment="center"
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android:textSize="60sp"
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app:layout_constraintBottom_toTopOf="@+id/button_mult"
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app:layout_constraintEnd_toStartOf="@+id/enumRight"
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app:layout_constraintStart_toEndOf="@+id/enumLeft"
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app:layout_constraintTop_toTopOf="parent" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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</layout>
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