Membuat Kalkulator di Android YuK..




malam sahabat Teknokrat, apa kabar hari ini ??
di kesempatan malam ini SaungIT mau membuat Tutorial membuat kalkulator  di android,
aplikasi kalkulator yang temen-temen bisa buat sendiri di hp android temen-temen, dan mudah-mudahan akan menambah pengetahuan tentang pemograman Android temen-temen,,




pasti penasaran nih temen-temen SauingIT :D
Ok, Langsung aja ya..

1,  Buka eclipsenya masing" buat project baru ==> File new, android project pada eclipse . temen-temen..





2. Nah Udah Terbentuk Projectnya, Copykan Di ClassUtama.java nya kode berikut :
NB: jika ada error2, tmen-tmen jangan panik dulu, mungkin nama class sama nama package nya ga sama, jadi tmen-tmen tinggal ganti aja sesuai nama project nya,,



package org.gum.mycalculator;

import android.app.Activity;
import android.os.Bundle;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;

public class MyCalculatorActivity extends Activity {
    /** Called when the activity is first created. */
	private final int BUTTON_DIVIDER=4;
	private final int OPERATOR_NULL=0;
	private final int OPERATOR_PLUS=1;
	private final int OPERATOR_MINUS=2;
	private final int OPERATOR_DIVIDE=3;
	private final int OPERATOR_MULTIPLY=4;
	private final int OPERATOR_EQUAL=5;
	
    EditText editText;
    StringBuffer textBuffer;
    float recentValue;
    int operator;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textBuffer=new StringBuffer("0");
        recentValue=0;
        operator=OPERATOR_NULL;
        editText=(EditText)findViewById(R.id.result);
        editText.setText(textBuffer);
        WindowManager windowManager=(WindowManager)getSystemService(WINDOW_SERVICE);
        Display display=windowManager.getDefaultDisplay();
        Button button0,button1,button2,button3,button4,button5,button6,button7,button8,button9;
        Button buttonplus,buttonminus,buttonmultiply,buttondivide,buttonequal,buttonclear;
        button0=(Button)findViewById(R.id.button0);
        setButtonWidth(button0,display.getWidth()/BUTTON_DIVIDER);
        button1=(Button)findViewById(R.id.button1);
        setButtonWidth(button1,display.getWidth()/BUTTON_DIVIDER);
        button2=(Button)findViewById(R.id.button2);
        setButtonWidth(button2,display.getWidth()/BUTTON_DIVIDER);
        button3=(Button)findViewById(R.id.button3);
        setButtonWidth(button3,display.getWidth()/BUTTON_DIVIDER);
        button4=(Button)findViewById(R.id.button4);
        setButtonWidth(button4,display.getWidth()/BUTTON_DIVIDER);
        button5=(Button)findViewById(R.id.button5);
        setButtonWidth(button5,display.getWidth()/BUTTON_DIVIDER);
        button6=(Button)findViewById(R.id.button6);
        setButtonWidth(button6,display.getWidth()/BUTTON_DIVIDER);
        button7=(Button)findViewById(R.id.button7);
        setButtonWidth(button7,display.getWidth()/BUTTON_DIVIDER);
        button8=(Button)findViewById(R.id.button8);
        setButtonWidth(button8,display.getWidth()/BUTTON_DIVIDER);
        button9=(Button)findViewById(R.id.button9);
        setButtonWidth(button9,display.getWidth()/BUTTON_DIVIDER);
        
        buttonplus=(Button)findViewById(R.id.buttonplus);
        buttonplus.setWidth(display.getWidth()/BUTTON_DIVIDER);
        buttonminus=(Button)findViewById(R.id.buttonminus);
        buttonminus.setWidth(display.getWidth()/BUTTON_DIVIDER);
        buttonmultiply=(Button)findViewById(R.id.buttonmultiply);
        buttonmultiply.setWidth(display.getWidth()/BUTTON_DIVIDER);
        buttondivide=(Button)findViewById(R.id.buttondivide);
        buttondivide.setWidth(display.getWidth()/BUTTON_DIVIDER);
        buttonequal=(Button)findViewById(R.id.buttonequal);
        buttonequal.setWidth(display.getWidth()/BUTTON_DIVIDER);
        
        setButtonWidth((Button)findViewById(R.id.buttondot),display.getWidth()/BUTTON_DIVIDER);
        setButtonWidth((Button)findViewById(R.id.buttonclear),display.getWidth()/BUTTON_DIVIDER);
	}
    public void buttonClickHandler(View v){
    	float tempValue;
    	boolean isClear=false;
    	switch(v.getId()){
    	case R.id.button0:
    		if(!(textBuffer.length()==1&&textBuffer.toString().equalsIgnoreCase("0")))
    		textBuffer.append(0);
    		break;
    	case R.id.button1:
    		textBuffer.append(1);
    		break;
    	case R.id.button2:
    		textBuffer.append(2);
    		break;
    	case R.id.button3:
    		textBuffer.append(3);
    		break;
    	case R.id.button4:
    		textBuffer.append(4);
    		break;
    	case R.id.button5:
    		textBuffer.append(5);
    		break;
    	case R.id.button6:
    		textBuffer.append(6);
    		break;
    	case R.id.button7:
    		textBuffer.append(7);
    		break;
    	case R.id.button8:
    		textBuffer.append(8);
    		break;
    	case R.id.button9:
    		textBuffer.append(9);
    		break;
    	case R.id.buttondot:
    		textBuffer.append('.');
    		break;
    		
    	case R.id.buttonplus:
    		tempValue=Float.parseFloat(textBuffer.toString());
    		textBuffer.delete(0, textBuffer.length());
    		setTextBufferByOperator(tempValue);
    		operator=OPERATOR_PLUS;
    		isClear=true;
    		break;
    	case R.id.buttonminus:
    		tempValue=Float.parseFloat(textBuffer.toString());
    		textBuffer.delete(0, textBuffer.length());
    		setTextBufferByOperator(tempValue);
    		operator=OPERATOR_MINUS;
    		isClear=true;
    		break;
    	case R.id.buttondivide:
    		tempValue=Float.parseFloat(textBuffer.toString());
    		textBuffer.delete(0, textBuffer.length());
    		setTextBufferByOperator(tempValue);
    		operator=OPERATOR_DIVIDE;
    		isClear=true;
    		break;
    	case R.id.buttonmultiply:
    		tempValue=Float.parseFloat(textBuffer.toString());
    		textBuffer.delete(0, textBuffer.length());
    		setTextBufferByOperator(tempValue);
    		operator=OPERATOR_MULTIPLY;
    		isClear=true;
    		break;
    	case R.id.buttonequal:
    		tempValue=Float.parseFloat(textBuffer.toString());
    		textBuffer.delete(0, textBuffer.length());
    		setTextBufferByOperator(tempValue);
    		operator=OPERATOR_EQUAL;
    		isClear=true;
    		break;
    	case R.id.buttonclear:
    		textBuffer.delete(0, textBuffer.length());
    		textBuffer.append(0);
    		operator=OPERATOR_NULL;
    		recentValue=0;
    	}
    	if(textBuffer.length()>1&&textBuffer.charAt(1)!='.'&&textBuffer.charAt(0)=='0')
    		textBuffer.deleteCharAt(0);
    	
    	editText.setText(textBuffer);
    
    	if(isClear){
    		textBuffer.delete(0, textBuffer.length());
    		textBuffer.append(0);
    	}
    }
    private void setTextBufferByOperator(float value){
    	switch(operator){
    	case OPERATOR_NULL:
    		recentValue=recentValue+value;
    		break;
    	case OPERATOR_PLUS:
    		recentValue=recentValue+value;
    		break;
    	case OPERATOR_MINUS:
    		recentValue=recentValue-value;
    		break;
    	case OPERATOR_DIVIDE:
    		recentValue=recentValue/value;
    		break;
    	case OPERATOR_MULTIPLY:
    		recentValue=recentValue*value;
    		break;
    	case OPERATOR_EQUAL:
    		operator=OPERATOR_NULL;
    		break;
    	}
    	textBuffer.append(recentValue);
    	if(textBuffer.charAt(textBuffer.length()-2)=='.'&&textBuffer.charAt(textBuffer.length()-1)=='0')
    		textBuffer.delete(textBuffer.length()-2, textBuffer.length());
    }
    private void setButtonWidth(Button button,int buttonWidth){
    	button.setWidth(buttonWidth);
    }
}




3. tahap selanjutnya, pada main.xml di layout temen temen copykan Kode berikut :





<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    style="@style/layoutff"
    >
    <EditText android:id="@+id/result" 
    	style="@style/layoutfw"
    	android:enabled="false"
    	android:gravity="right"
    />
    
    <LinearLayout 
    	style="@style/layoutbuttoncontainer">
    	<Button android:id="@+id/buttonclear"
    		style="@style/layoutbutton"    
    		android:text="C"/>
    </LinearLayout>
    <LinearLayout 
    	style="@style/layoutbuttoncontainer">
    	<Button android:tag="7"
    		android:id="@+id/button7"
    		style="@style/layoutbutton"
    		android:text="7"
    		/>
    	<Button android:tag="8"
    		android:id="@+id/button8"
    		style="@style/layoutbutton"
    		android:text="8"
    		/>
    	<Button android:tag="9" 
    		android:id="@+id/button9"
    		style="@style/layoutbutton"
    		android:text="9"
    		/>
    	<Button android:id="@+id/buttondivide"
    		style="@style/layoutbutton"
    		android:text="/"/>
    </LinearLayout>
    <LinearLayout 
    	style="@style/layoutbuttoncontainer">
    	<Button android:id="@+id/button4"
    		style="@style/layoutbutton"
    		android:text="4"/>
    	<Button android:id="@+id/button5"
    		style="@style/layoutbutton"
    		android:text="5"/>
    	<Button android:id="@+id/button6"
    		style="@style/layoutbutton"
    		android:text="6"/>
    	<Button android:id="@+id/buttonmultiply"
    		style="@style/layoutbutton"
    		android:text="*"/>
    </LinearLayout>
    <LinearLayout 
    	style="@style/layoutbuttoncontainer">
    	<Button android:id="@+id/button1"
    		style="@style/layoutbutton"
    		android:text="1"/>
    	<Button android:id="@+id/button2"
    		style="@style/layoutbutton"
    		android:text="2"/>
    	<Button android:id="@+id/button3"
    		style="@style/layoutbutton"
    		android:text="3"/>
    	<Button android:id="@+id/buttonminus"
    		style="@style/layoutbutton"
    		android:text="-"/>
    </LinearLayout>
    <LinearLayout 
    	style="@style/layoutbuttoncontainer">
    	<Button android:id="@+id/button0"
    		style="@style/layoutbutton"
    		android:text="0"/>
    	<Button android:id="@+id/buttondot"
    		style="@style/layoutbutton"
    		android:text="."/>
    	<Button android:id="@+id/buttonplus"
    		style="@style/layoutbutton"
    		android:text="+"/>
    	<Button android:id="@+id/buttonequal"
    		style="@style/layoutbutton"
    		android:text="="/>
    </LinearLayout>
</LinearLayout>




Mudah kan, :D Nah klo udah terCopy semua temen-temen bisa langsung Run aplikasi nya..

dan hasilnya akan seperti gambar di bawah ini :




oke deh, selamat mencoba ya, tunggu tutorial-tutorial selanjutnya dari Saungit ..

salam Teknokrat..

11 komentar:

  1. Anonim mengatakan...:

    maantapp kakaksss salam teknokrat

  1. Diah mengatakan...:

    minta workspacenya dong. pleaseeeeeeeee

  1. abdul hadi mengatakan...:
    Komentar ini telah dihapus oleh pengarang.
  1. abdul hadi mengatakan...:

    bang.admin ane mw tanya nih cz msh newbie, tw sample bluetoothchat d eclipse kan? nah ane tuh pingin wktu dy nrima karakter tertentu dr hp lain dy bs ngeluarin fungsi, misal munculin tulisan atw gambar. (feedback)
    contoh yg ane cb kyk gni tp g bs hehe :

    case MESSAGE_READ:
    byte[] readBuf = (byte[]) msg.obj;
    // construct a string from the valid bytes in the buffer
    String readMessage = new String(readBuf, 0, msg.arg1);
    mConversationArrayAdapter.add(mConnectedDeviceName+": " + readMessage);
    if (readMessage == "5" )
    Toast.makeText(getApplicationContext(), "nyala",Toast.LENGTH_SHORT).show();
    finish();
    if (readMessage == "6" )
    Toast.makeText(getApplicationContext(), "Alhamdulillah",Toast.LENGTH_SHORT).show();
    finish();

    break; )

    tolong pencerahannya ya... send me in [email protected], i realy need it guys.

  1. ri cots mengatakan...:

    kok eror ya

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  1. Kai sar mengatakan...:

    Admin mana gak ada hasilnya koplak lah...

  1. Kai sar mengatakan...:

    Admin mana gak ada hasilnya koplak lah...

  1. Abal Abal mengatakan...:

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  1. sederiupo mengatakan...:

    hahaa lumayan rumit ya cara bikinnya...
    solder temperatur

  1. gun2r mengatakan...:

    Sori maaf mau tanya punya saya error' emulatornya, minta sarannya emulator yg bagus apa ya??
    Trus biar emulator langsung nempel dan bisa jadi target dibandroid studionya gmn ya?

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