Relève le défi !
Réserve toi 1h aujourd’hui (ou demain si tu lis cet article tard le soir 🙂 ) pour développer un convertisseur de monnaie. Je t’explique tout dans la vidéo juste en dessous !
Ressources :
- Créer un Spinner (liste déroulante) : https://developpezvosappsandroid.com/utiliser-doc-android-spinner
- Un article où on utilise les EditText : https://developpezvosappsandroid.com/comment-creer-formulaire-login
La solution que je propose
Le layout (main_activity.xml) :
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:gravity="center"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Space
android:layout_width="20dp"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:id="@+id/edittext1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Valeur 1"
android:inputType="numberDecimal" />
<Space
android:layout_width="20dp"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/edittext2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Valeur 2"
android:inputType="numberDecimal" />
</LinearLayout>
</LinearLayout>
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Le fichier strings.xml :
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<resources>
<string name="app_name">ConversionMonnaie</string>
<string-array name="monnaies_array">
<item>Euro</item>
<item>Dollar</item>
<item>Livre Sterling</item>
<item>Peso mexicain</item>
</string-array>
<!-- Taux pour convertir 1€ en la monnaie -->
<string-array name="monnaies_taux_array">
<item>1</item>
<item>1.17</item>
<item>0.89</item>
<item>21.97</item>
</string-array>
</resources>
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Le fichier Java (MainActivity.java) :
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import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
public class MainActivity extends AppCompatActivity {
Spinner spinner1;
Spinner spinner2;
EditText editText1;
EditText editText2;
boolean updateEditText = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner1 = findViewById(R.id.spinner1);
spinner2 = findViewById(R.id.spinner2);
editText1 = findViewById(R.id.edittext1);
editText2 = findViewById(R.id.edittext2);
//Initialisation des Spinners
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.monnaies_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter);
spinner2.setAdapter(adapter);
spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
updateConversion(editText1.getText().toString(), editText2, spinner1, spinner2);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
updateConversion(editText1.getText().toString(), editText2, spinner1, spinner2);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
//Initialisation des EditText
editText1.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
updateConversion(s.toString(), editText2, spinner1, spinner2);
}
});
editText2.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
updateConversion(s.toString(), editText1, spinner2, spinner1);
}
});
}
public void updateConversion(String valeurDepart, EditText editTextArrive, Spinner spinnerDepart, Spinner spinnerArrivee){
if (updateEditText)
return;
int monnaieDepartPos = spinnerDepart.getSelectedItemPosition();
int monnaieArriveePos = spinnerArrivee.getSelectedItemPosition();
double valeurDepartD = 0;
try {
valeurDepartD = Double.parseDouble(valeurDepart);
} catch (Exception e){
return;
}
double valeurConvertie = conversion(monnaieDepartPos, monnaieArriveePos, valeurDepartD);
valeurConvertie = Math.round(valeurConvertie * 100) / (double) 100;
updateEditText = true;
editTextArrive.setText(valeurConvertie + "");
updateEditText = false;
}
public double conversion(int monnaieDepartPos, int monnaieArriveePos, double valeurDepart){
String[] tauxArray = getResources().getStringArray(R.array.monnaies_taux_array);
double taux1 = Double.parseDouble(tauxArray[monnaieDepartPos]);
double taux2 = Double.parseDouble(tauxArray[monnaieArriveePos]);
double valeurEuro = valeurDepart * (1/taux1);
double valeurArrivee = valeurEuro * taux2;
return valeurArrivee;
}
}
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