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 {
        enum Ops {
                None,
                Addition,
                Subtraction,
                Multiplication,
                Division,
                Sqr,
                Sqrt,
                Pow,
                Mroot
        }
        
        
        EditText mEdit;
        
        
        double mVal1;
        Ops mOperation = Ops.None;
        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.btnclear).setOnClickListener( new ClearClick() );
        findViewById(R.id.btnpoint).setOnClickListener( new PointClick() );
        
        findViewById(R.id.btnadd).setOnClickListener( new OperationClick(Ops.Addition) );
        findViewById(R.id.btnsub).setOnClickListener( new OperationClick(Ops.Subtraction) );
        findViewById(R.id.btnmul).setOnClickListener( new OperationClick(Ops.Multiplication) );
        findViewById(R.id.btndiv).setOnClickListener( new OperationClick(Ops.Division) );
        findViewById(R.id.btnpow).setOnClickListener( new OperationClick(Ops.Pow) );
        findViewById(R.id.btnmroot).setOnClickListener( new OperationClick(Ops.Mroot) );
        
        findViewById(R.id.btnsqr).setOnClickListener( new SingleOperationClick(Ops.Sqr) );
        findViewById(R.id.btnsqrt).setOnClickListener( new SingleOperationClick(Ops.Sqrt) );
        
        findViewById(R.id.btnsum).setOnClickListener( new SumClick() );
        
        mEdit = (EditText) findViewById(R.id.edit);
        mEdit.setCursorVisible(false);
       
        
    }
    
    void setResult(double res) {
                if ( Double.isInfinite(res) || Double.isNaN(res) ) {
                        mClear = true;
                }
                
                
                mEdit.setText( Double.toString(res) );
                mOperation = Ops.None;
                mVal1 = res;
    }
    
    
    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 ) {
                                mClear=false;
                                tempText.clear();
                        }
                        tempText.append(mNumval);                       
                }
        
    }
    
    class BackClick implements View.OnClickListener {

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

                @Override
                public void onClick(View v) {
                        mClear = false;
                        mEdit.setText("0");
                        mOperation = Ops.None;
                        mVal1 = 0;
                }
    }
    
    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 {
        Ops mOp;
        public OperationClick(Ops op) {
                mOp = op;
        }

                @Override
                public void onClick(View v) {                   
                        mVal1 = Double.parseDouble( mEdit.getText().toString() );
                        mEdit.setText("0");
                        
                        mOperation = mOp;
                        
                }
    }
    
    class SingleOperationClick implements View.OnClickListener {
        Ops mOp;
        public SingleOperationClick(Ops op) {
                mOp = op;
        }

                @Override
                public void onClick(View v) {                   
                        mVal1 = Double.parseDouble( mEdit.getText().toString() );
                        
                        double res = 0.0;
                        switch (mOp) {
                        case Sqr:
                                res = mVal1 * mVal1; 
                                break;
                        case Sqrt:
                                res = Math.sqrt(mVal1);
                                break;
                        }
                        setResult(res);
                }
    }
    
    class SumClick implements View.OnClickListener {
                @Override
                public void onClick(View v) {
                        if (mOperation == Ops.None) {
                                return;
                        }                       
                        
                        double val2 = Double.parseDouble( mEdit.getText().toString() );

                        double res = 0.0;
                        switch (mOperation) {
                        case Addition:
                                res = mVal1 + val2;
                                break;
                        case Subtraction:
                                res = mVal1 - val2;
                                break;
                        case Multiplication:
                                res = mVal1 * val2;
                                break;
                        case Division:
                                res = mVal1 / val2;
                                break;
                        case Pow:
                                res = Math.pow(mVal1, val2);
                                break;
                        case Mroot:
                                res = Math.pow(val2, (1.0/mVal1) );
                        }
                        
                        setResult(res);
                }
    }    
}
1	torben	931	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	torben	936	enum Ops {
11			None,
12			Addition,
13			Subtraction,
14			Multiplication,
15	torben	938	Division,
16			Sqr,
17	torben	940	Sqrt,
18			Pow,
19			Mroot
20	torben	936	}
21	torben	931
22	torben	936
23	torben	931	EditText mEdit;
24
25
26			double mVal1;
27	torben	936	Ops mOperation = Ops.None;
28	torben	931	boolean mClear = false;
29
30			@Override
31			public void onCreate(Bundle savedInstanceState) {
32			super.onCreate(savedInstanceState);
33			setContentView(R.layout.main);
34
35			findViewById(R.id.btn0).setOnClickListener( new NumericClick('0') );
36			findViewById(R.id.btn1).setOnClickListener( new NumericClick('1') );
37			findViewById(R.id.btn2).setOnClickListener( new NumericClick('2') );
38			findViewById(R.id.btn3).setOnClickListener( new NumericClick('3') );
39			findViewById(R.id.btn4).setOnClickListener( new NumericClick('4') );
40			findViewById(R.id.btn5).setOnClickListener( new NumericClick('5') );
41			findViewById(R.id.btn6).setOnClickListener( new NumericClick('6') );
42			findViewById(R.id.btn7).setOnClickListener( new NumericClick('7') );
43			findViewById(R.id.btn8).setOnClickListener( new NumericClick('8') );
44			findViewById(R.id.btn9).setOnClickListener( new NumericClick('9') );
45
46			findViewById(R.id.btnback).setOnClickListener( new BackClick() );
47	torben	938	findViewById(R.id.btnclear).setOnClickListener( new ClearClick() );
48	torben	931	findViewById(R.id.btnpoint).setOnClickListener( new PointClick() );
49
50	torben	936	findViewById(R.id.btnadd).setOnClickListener( new OperationClick(Ops.Addition) );
51			findViewById(R.id.btnsub).setOnClickListener( new OperationClick(Ops.Subtraction) );
52			findViewById(R.id.btnmul).setOnClickListener( new OperationClick(Ops.Multiplication) );
53			findViewById(R.id.btndiv).setOnClickListener( new OperationClick(Ops.Division) );
54	torben	940	findViewById(R.id.btnpow).setOnClickListener( new OperationClick(Ops.Pow) );
55			findViewById(R.id.btnmroot).setOnClickListener( new OperationClick(Ops.Mroot) );
56	torben	931
57	torben	938	findViewById(R.id.btnsqr).setOnClickListener( new SingleOperationClick(Ops.Sqr) );
58			findViewById(R.id.btnsqrt).setOnClickListener( new SingleOperationClick(Ops.Sqrt) );
59
60	torben	931	findViewById(R.id.btnsum).setOnClickListener( new SumClick() );
61
62			mEdit = (EditText) findViewById(R.id.edit);
63			mEdit.setCursorVisible(false);
64
65
66			}
67
68	torben	938	void setResult(double res) {
69			if ( Double.isInfinite(res) \|\| Double.isNaN(res) ) {
70			mClear = true;
71			}
72
73
74			mEdit.setText( Double.toString(res) );
75			mOperation = Ops.None;
76			mVal1 = res;
77			}
78	torben	931
79	torben	938
80	torben	931	class NumericClick implements View.OnClickListener {
81			char mNumval;
82
83			public NumericClick(char numval) {
84			mNumval = numval;
85			}
86
87			@Override
88			public void onClick(View v) {
89			Editable tempText = mEdit.getText();
90
91			if (tempText.toString().equals("0") \|\| mClear==true ) {
92	torben	935	mClear=false;
93	torben	931	tempText.clear();
94			}
95			tempText.append(mNumval);
96			}
97
98			}
99
100			class BackClick implements View.OnClickListener {
101
102			@Override
103			public void onClick(View v) {
104			if (mClear) {
105	torben	933	mClear = false;
106	torben	931	mEdit.setText("0");
107			return;
108			}
109
110			Editable tempText = mEdit.getText();
111			if (tempText.length() > 0) {
112			CharSequence cs = tempText.subSequence(0, tempText.length() -1);
113			mEdit.setText(cs);
114			}
115			}
116			}
117
118	torben	938	class ClearClick implements View.OnClickListener {
119
120			@Override
121			public void onClick(View v) {
122			mClear = false;
123			mEdit.setText("0");
124			mOperation = Ops.None;
125			mVal1 = 0;
126			}
127			}
128
129	torben	931	class PointClick implements View.OnClickListener {
130
131			@Override
132			public void onClick(View v) {
133
134			Editable tempText = mEdit.getText();
135			if (tempText.toString().indexOf('.') == -1) {
136			tempText.append('.');
137			}
138			}
139			}
140
141			class OperationClick implements View.OnClickListener {
142	torben	936	Ops mOp;
143			public OperationClick(Ops op) {
144	torben	931	mOp = op;
145			}
146
147			@Override
148			public void onClick(View v) {
149			mVal1 = Double.parseDouble( mEdit.getText().toString() );
150			mEdit.setText("0");
151
152			mOperation = mOp;
153
154			}
155			}
156
157	torben	938	class SingleOperationClick implements View.OnClickListener {
158			Ops mOp;
159			public SingleOperationClick(Ops op) {
160			mOp = op;
161			}
162
163			@Override
164			public void onClick(View v) {
165			mVal1 = Double.parseDouble( mEdit.getText().toString() );
166
167			double res = 0.0;
168			switch (mOp) {
169			case Sqr:
170			res = mVal1 * mVal1;
171			break;
172			case Sqrt:
173			res = Math.sqrt(mVal1);
174			break;
175			}
176			setResult(res);
177			}
178			}
179
180	torben	931	class SumClick implements View.OnClickListener {
181			@Override
182			public void onClick(View v) {
183	torben	936	if (mOperation == Ops.None) {
184	torben	931	return;
185			}
186
187			double val2 = Double.parseDouble( mEdit.getText().toString() );
188
189	torben	937	double res = 0.0;
190	torben	931	switch (mOperation) {
191	torben	936	case Addition:
192	torben	931	res = mVal1 + val2;
193			break;
194	torben	936	case Subtraction:
195	torben	931	res = mVal1 - val2;
196			break;
197	torben	936	case Multiplication:
198	torben	931	res = mVal1 * val2;
199			break;
200	torben	936	case Division:
201	torben	931	res = mVal1 / val2;
202	torben	940	break;
203			case Pow:
204			res = Math.pow(mVal1, val2);
205			break;
206			case Mroot:
207			res = Math.pow(val2, (1.0/mVal1) );
208	torben	931	}
209
210	torben	938	setResult(res);
211	torben	931	}
212			}
213			}