- Forum-Beiträge: 4
26.04.2015, 19:06:58 via Website
26.04.2015 19:06:58 via Website
Hallo,
ich habe folgenden Code für einen Taschenrechner mit den Grundrechenarten erstellt. Leider finde ich den Fehler nicht,s. warum mein Buttons keine Wert in den Edittext übergeben und anzeigen. Sprich in der Simulation kann ich zwar auf die Buttons drücken aber es passiert nichts. Da ich leider Anfänger bin und ich diesen Taschenrechner für einen Informatikvortrag lauffähig machen muss, benötige ich eure Hilfe. Der Quellcode wurde mit aktuellen Android Studio geschrieben.
Vielen Dank schonmal!!!!
Eingabejava
package de yolotec taschenrechnermastya;
import android.content.DialogInterface;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class Eingabe extends ActionBarActivity {
private EditText Scr; // Eingabefeld
private float NumberBf; // speichert Eingabefeld
private String operation;
private ButtonClickListener btnClick;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_eingabe);
Scr = (EditText) findViewById(R.id.Anzeige);
int idList[] = {R.id.button0,R.id.button1,R.id.button2,R.id.button3,R.id.buttonaddieren,R.id.button6,R.id.button7,R.id.button8,
R.id.button9,R.id.buttonaddieren,R.id.button5,R.id.buttonmal,R.id.buttongeteilt,
R.id.buttonfakultät,R.id.buttonlöschen,R.id.buttonsqrt,R.id.buttonergebnis,R.id.button5
};
for (int id:idList) {
View v = findViewById(id);
v.setOnClickListener(btnClick);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_eingabe, menu);
return true;
}
public void mMath(String str){
NumberBf = Float.parseFloat(Scr.getText().toString());
operation = str;
Scr.setText("0");
}
public void getKeyboard(String str){
String ScrCurrent = Scr.getText().toString();
if (ScrCurrent.equals("0"))
ScrCurrent = "";
ScrCurrent += str;
Scr.setText(ScrCurrent);
}
public void mResult() {
float NumAf = Float.parseFloat(Scr.getText().toString());
float result = 0;
if (operation.equals("+")){
result = NumAf + NumberBf;
}
if (operation.equals("-")){
result = NumberBf - NumAf;
}
if (operation.equals("*")){
result = NumAf * NumberBf;
}
if (operation.equals("/")){
result = NumberBf / NumAf;
}
if (operation.equals("Sqrt")){
result = (float) Math.sqrt(NumberBf);
}
// if (operation.equals("n!")){
// result = NumAf n! NumberBf;
// }
Scr.setText(String.valueOf(result));
}
private class ButtonClickListener implements View.OnClickListener {
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonlöschen:
Scr.setText("0");
NumberBf = 0;
operation = "";
break;
case R.id.buttonaddieren:
mMath("+");
break;
case R.id.buttonminus:
mMath("-");
break;
case R.id.buttonmal:
mMath("*");
break;
case R.id.buttongeteilt:
mMath("/");
break;
case R.id.buttonsqrt:
mMath("Sqrt");
break;
case R.id.buttonergebnis:
mResult();
break;
default:
String numb = ((Button) v).getText().toString();
getKeyboard(numb);
break;
}
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
eingabe xml
<RelativeLayout xmlns:android="schemas.android.com/apk/res/android"
xmlns:tools="schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".Eingabe">
<Button
android:layout_width="250dp"
android:layout_height="wrap_content"
android:text="@string/ergebnis"
android:id="@+id/buttonergebnis"
android:layout_above="@+id/buttonlöschen"
android:layout_centerHorizontal="true"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/löschen"
android:id="@+id/buttonlöschen"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:clickable="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text="@string/anzeige"
android:id="@+id/Anzeige"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:gravity="center|right"
android:textSize="@dimen/abc_text_size_title_material"
android:inputType="number" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button1"
android:id="@+id/button1"
android:layout_below="@+id/Anzeige"
android:layout_marginTop="71dp"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button2"
android:id="@+id/button2"
android:layout_alignTop="@+id/button1"
android:layout_toRightOf="@+id/button1"
android:layout_toEndOf="@+id/button1"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonplus"
android:id="@+id/buttonaddieren"
android:layout_toRightOf="@+id/button3"
android:layout_above="@+id/buttonminus"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button6"
android:id="@+id/button6"
android:layout_below="@+id/button1"
android:layout_toRightOf="@+id/button5"
android:layout_toEndOf="@+id/button5"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button4"
android:id="@+id/buttonaddieren"
android:layout_below="@+id/button1"
android:layout_alignLeft="@+id/button1"
android:layout_alignStart="@+id/button1"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonminus"
android:id="@+id/buttonminus"
android:layout_toRightOf="@+id/button3"
android:layout_above="@+id/buttonmal"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button5"
android:id="@+id/button5"
android:layout_toRightOf="@+id/buttonaddieren"
android:layout_alignTop="@+id/buttonaddieren"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button3"
android:id="@+id/button3"
android:layout_toRightOf="@+id/button2"
android:layout_above="@+id/button6"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button7"
android:id="@+id/button7"
android:layout_below="@+id/buttonaddieren"
android:layout_toLeftOf="@+id/button5"
android:layout_toStartOf="@+id/button5"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button8"
android:id="@+id/button8"
android:layout_below="@+id/buttonaddieren"
android:layout_toRightOf="@+id/button7"
android:layout_toEndOf="@+id/button7"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button9"
android:id="@+id/button9"
android:layout_below="@+id/button5"
android:layout_toRightOf="@+id/button5"
android:layout_toEndOf="@+id/button5"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonmal"
android:id="@+id/buttonmal"
android:layout_alignTop="@+id/button9"
android:layout_toRightOf="@+id/button9"
android:layout_toEndOf="@+id/button9"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonsqrt"
android:id="@+id/buttonsqrt"
android:layout_below="@+id/button7"
android:layout_alignLeft="@+id/button7"
android:layout_alignStart="@+id/button7"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button0"
android:id="@+id/button0"
android:layout_below="@+id/button7"
android:layout_toRightOf="@+id/buttonsqrt"
android:layout_toEndOf="@+id/buttonsqrt"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttonfakultät"
android:id="@+id/buttonfakultät"
android:layout_below="@+id/button8"
android:layout_toRightOf="@+id/button8"
android:layout_toEndOf="@+id/button8"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/buttongeteilt"
android:id="@+id/buttongeteilt"
android:layout_below="@+id/button9"
android:layout_toRightOf="@+id/buttonfakultät"
android:layout_toEndOf="@+id/buttonfakultät"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:clickable="true" />
</RelativeLayout>
— geändert am 26.04.2015, 19:11:14
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