thoerup/calculator/CalculatorActivity.java

package dk.thoerup.calculator;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.EditText;

public class CalculatorActivity extends Activity {
    /** Called when the activity is first created. */
        
        EditText mEdit;
        
        
        double mVal1;
        char mOperation = ' ';
        boolean mClear = false;
                
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        findViewById(R.id.btn0).setOnClickListener( new NumericClick('0') );
        findViewById(R.id.btn1).setOnClickListener( new NumericClick('1') );
        findViewById(R.id.btn2).setOnClickListener( new NumericClick('2') );
        findViewById(R.id.btn3).setOnClickListener( new NumericClick('3') );
        findViewById(R.id.btn4).setOnClickListener( new NumericClick('4') );
        findViewById(R.id.btn5).setOnClickListener( new NumericClick('5') );
        findViewById(R.id.btn6).setOnClickListener( new NumericClick('6') );
        findViewById(R.id.btn7).setOnClickListener( new NumericClick('7') );
        findViewById(R.id.btn8).setOnClickListener( new NumericClick('8') );
        findViewById(R.id.btn9).setOnClickListener( new NumericClick('9') );
     
        findViewById(R.id.btnback).setOnClickListener( new BackClick() );
        findViewById(R.id.btnpoint).setOnClickListener( new PointClick() );
        
        findViewById(R.id.btnadd).setOnClickListener( new OperationClick('+') );
        findViewById(R.id.btnsub).setOnClickListener( new OperationClick('-') );
        findViewById(R.id.btnmul).setOnClickListener( new OperationClick('*') );
        findViewById(R.id.btndiv).setOnClickListener( new OperationClick('/') );
        
        findViewById(R.id.btnsum).setOnClickListener( new SumClick() );
        
        mEdit = (EditText) findViewById(R.id.edit);
        mEdit.setCursorVisible(false);
       
        
    }
    
    
    class NumericClick implements View.OnClickListener {
        char mNumval;

        public NumericClick(char numval) {
                mNumval = numval;
        }
        
                @Override
                public void onClick(View v) {
                        Editable tempText = mEdit.getText();
                        
                        if (tempText.toString().equals("0") || mClear==true ) {
                                tempText.clear();
                        }
                        tempText.append(mNumval);                       
                }
        
    }
    
    class BackClick implements View.OnClickListener {

                @Override
                public void onClick(View v) {
                        if (mClear) {
                                mEdit.setText("0");
                                return;
                        }
                        
                        Editable tempText = mEdit.getText();
                        if (tempText.length() > 0) {
                                CharSequence cs = tempText.subSequence(0, tempText.length() -1);
                                mEdit.setText(cs);
                        }
                }
    }
    
    class PointClick implements View.OnClickListener {

                @Override
                public void onClick(View v) {                   
                        
                        Editable tempText = mEdit.getText();
                        if (tempText.toString().indexOf('.') == -1) {
                                tempText.append('.');
                        }
                }
    }
    
    class OperationClick implements View.OnClickListener {
        char mOp;
        public OperationClick(char op) {
                mOp = op;
        }

                @Override
                public void onClick(View v) {                   
                        mVal1 = Double.parseDouble( mEdit.getText().toString() );
                        mEdit.setText("0");
                        
                        mOperation = mOp;
                        
                }
    }
    
    class SumClick implements View.OnClickListener {
                @Override
                public void onClick(View v) {
                        if (mOperation == ' ') {
                                return;
                        }                       
                        
                        double val2 = Double.parseDouble( mEdit.getText().toString() );

                        Double res = 0.0;
                        switch (mOperation) {
                        case '+':
                                res = mVal1 + val2;
                                break;
                        case '-':
                                res = mVal1 - val2;
                                break;
                        case '*':
                                res = mVal1 * val2;
                                break;
                        case '/':
                                res = mVal1 / val2;
                                break;                          
                        }
                        
                        if ( res.isInfinite() || res.isNaN() ) {
                                mClear = true;
                        }
                        
                        mEdit.setText( res.toString() );
                        mOperation = ' ';
                        mVal1 = res;
                }
    }    
}
1	package dk.thoerup.calculator;
2
3	import android.app.Activity;
4	import android.os.Bundle;
5	import android.text.Editable;
6	import android.view.View;
7	import android.widget.EditText;
8
9	public class CalculatorActivity extends Activity {
10	/** Called when the activity is first created. */
11
12	EditText mEdit;
13
14
15	double mVal1;
16	char mOperation = ' ';
17	boolean mClear = false;
18
19	@Override
20	public void onCreate(Bundle savedInstanceState) {
21	super.onCreate(savedInstanceState);
22	setContentView(R.layout.main);
23
24	findViewById(R.id.btn0).setOnClickListener( new NumericClick('0') );
25	findViewById(R.id.btn1).setOnClickListener( new NumericClick('1') );
26	findViewById(R.id.btn2).setOnClickListener( new NumericClick('2') );
27	findViewById(R.id.btn3).setOnClickListener( new NumericClick('3') );
28	findViewById(R.id.btn4).setOnClickListener( new NumericClick('4') );
29	findViewById(R.id.btn5).setOnClickListener( new NumericClick('5') );
30	findViewById(R.id.btn6).setOnClickListener( new NumericClick('6') );
31	findViewById(R.id.btn7).setOnClickListener( new NumericClick('7') );
32	findViewById(R.id.btn8).setOnClickListener( new NumericClick('8') );
33	findViewById(R.id.btn9).setOnClickListener( new NumericClick('9') );
34
35	findViewById(R.id.btnback).setOnClickListener( new BackClick() );
36	findViewById(R.id.btnpoint).setOnClickListener( new PointClick() );
37
38	findViewById(R.id.btnadd).setOnClickListener( new OperationClick('+') );
39	findViewById(R.id.btnsub).setOnClickListener( new OperationClick('-') );
40	findViewById(R.id.btnmul).setOnClickListener( new OperationClick('*') );
41	findViewById(R.id.btndiv).setOnClickListener( new OperationClick('/') );
42
43	findViewById(R.id.btnsum).setOnClickListener( new SumClick() );
44
45	mEdit = (EditText) findViewById(R.id.edit);
46	mEdit.setCursorVisible(false);
47
48
49	}
50
51
52	class NumericClick implements View.OnClickListener {
53	char mNumval;
54
55	public NumericClick(char numval) {
56	mNumval = numval;
57	}
58
59	@Override
60	public void onClick(View v) {
61	Editable tempText = mEdit.getText();
62
63	if (tempText.toString().equals("0") \|\| mClear==true ) {
64	tempText.clear();
65	}
66	tempText.append(mNumval);
67	}
68
69	}
70
71	class BackClick implements View.OnClickListener {
72
73	@Override
74	public void onClick(View v) {
75	if (mClear) {
76	mEdit.setText("0");
77	return;
78	}
79
80	Editable tempText = mEdit.getText();
81	if (tempText.length() > 0) {
82	CharSequence cs = tempText.subSequence(0, tempText.length() -1);
83	mEdit.setText(cs);
84	}
85	}
86	}
87
88	class PointClick implements View.OnClickListener {
89
90	@Override
91	public void onClick(View v) {
92
93	Editable tempText = mEdit.getText();
94	if (tempText.toString().indexOf('.') == -1) {
95	tempText.append('.');
96	}
97	}
98	}
99
100	class OperationClick implements View.OnClickListener {
101	char mOp;
102	public OperationClick(char op) {
103	mOp = op;
104	}
105
106	@Override
107	public void onClick(View v) {
108	mVal1 = Double.parseDouble( mEdit.getText().toString() );
109	mEdit.setText("0");
110
111	mOperation = mOp;
112
113	}
114	}
115
116	class SumClick implements View.OnClickListener {
117	@Override
118	public void onClick(View v) {
119	if (mOperation == ' ') {
120	return;
121	}
122
123	double val2 = Double.parseDouble( mEdit.getText().toString() );
124
125	Double res = 0.0;
126	switch (mOperation) {
127	case '+':
128	res = mVal1 + val2;
129	break;
130	case '-':
131	res = mVal1 - val2;
132	break;
133	case '*':
134	res = mVal1 * val2;
135	break;
136	case '/':
137	res = mVal1 / val2;
138	break;
139	}
140
141	if ( res.isInfinite() \|\| res.isNaN() ) {
142	mClear = true;
143	}
144
145	mEdit.setText( res.toString() );
146	mOperation = ' ';
147	mVal1 = res;
148	}
149	}
150	}