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package dk.thoerup.calculator; |
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import android.app.Activity; |
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import android.os.Bundle; |
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import android.text.Editable; |
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import android.view.View; |
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import android.widget.EditText; |
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public class CalculatorActivity extends Activity { |
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enum Ops { |
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None, |
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Addition, |
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Subtraction, |
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Multiplication, |
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Division, |
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Sqr, |
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Sqrt |
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} |
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|
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|
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EditText mEdit; |
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|
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|
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double mVal1; |
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Ops mOperation = Ops.None; |
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boolean mClear = false; |
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|
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@Override |
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public void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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setContentView(R.layout.main); |
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|
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findViewById(R.id.btn0).setOnClickListener( new NumericClick('0') ); |
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findViewById(R.id.btn1).setOnClickListener( new NumericClick('1') ); |
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findViewById(R.id.btn2).setOnClickListener( new NumericClick('2') ); |
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findViewById(R.id.btn3).setOnClickListener( new NumericClick('3') ); |
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findViewById(R.id.btn4).setOnClickListener( new NumericClick('4') ); |
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findViewById(R.id.btn5).setOnClickListener( new NumericClick('5') ); |
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findViewById(R.id.btn6).setOnClickListener( new NumericClick('6') ); |
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findViewById(R.id.btn7).setOnClickListener( new NumericClick('7') ); |
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findViewById(R.id.btn8).setOnClickListener( new NumericClick('8') ); |
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findViewById(R.id.btn9).setOnClickListener( new NumericClick('9') ); |
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|
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findViewById(R.id.btnback).setOnClickListener( new BackClick() ); |
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findViewById(R.id.btnclear).setOnClickListener( new ClearClick() ); |
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findViewById(R.id.btnpoint).setOnClickListener( new PointClick() ); |
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|
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findViewById(R.id.btnadd).setOnClickListener( new OperationClick(Ops.Addition) ); |
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findViewById(R.id.btnsub).setOnClickListener( new OperationClick(Ops.Subtraction) ); |
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findViewById(R.id.btnmul).setOnClickListener( new OperationClick(Ops.Multiplication) ); |
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findViewById(R.id.btndiv).setOnClickListener( new OperationClick(Ops.Division) ); |
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|
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findViewById(R.id.btnsqr).setOnClickListener( new SingleOperationClick(Ops.Sqr) ); |
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findViewById(R.id.btnsqrt).setOnClickListener( new SingleOperationClick(Ops.Sqrt) ); |
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|
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findViewById(R.id.btnsum).setOnClickListener( new SumClick() ); |
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|
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mEdit = (EditText) findViewById(R.id.edit); |
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mEdit.setCursorVisible(false); |
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|
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|
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} |
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|
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void setResult(double res) { |
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if ( Double.isInfinite(res) || Double.isNaN(res) ) { |
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mClear = true; |
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} |
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|
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|
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mEdit.setText( Double.toString(res) ); |
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mOperation = Ops.None; |
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mVal1 = res; |
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} |
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|
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|
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class NumericClick implements View.OnClickListener { |
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char mNumval; |
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public NumericClick(char numval) { |
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mNumval = numval; |
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} |
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|
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@Override |
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public void onClick(View v) { |
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Editable tempText = mEdit.getText(); |
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if (tempText.toString().equals("0") || mClear==true ) { |
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mClear=false; |
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tempText.clear(); |
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} |
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tempText.append(mNumval); |
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} |
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|
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} |
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class BackClick implements View.OnClickListener { |
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|
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@Override |
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public void onClick(View v) { |
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if (mClear) { |
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mClear = false; |
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mEdit.setText("0"); |
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return; |
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} |
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|
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Editable tempText = mEdit.getText(); |
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if (tempText.length() > 0) { |
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CharSequence cs = tempText.subSequence(0, tempText.length() -1); |
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mEdit.setText(cs); |
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} |
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} |
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} |
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class ClearClick implements View.OnClickListener { |
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|
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@Override |
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public void onClick(View v) { |
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mClear = false; |
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mEdit.setText("0"); |
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mOperation = Ops.None; |
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mVal1 = 0; |
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} |
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} |
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|
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class PointClick implements View.OnClickListener { |
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|
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@Override |
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public void onClick(View v) { |
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Editable tempText = mEdit.getText(); |
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if (tempText.toString().indexOf('.') == -1) { |
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tempText.append('.'); |
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} |
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} |
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} |
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|
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class OperationClick implements View.OnClickListener { |
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Ops mOp; |
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public OperationClick(Ops op) { |
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mOp = op; |
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} |
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|
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@Override |
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public void onClick(View v) { |
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mVal1 = Double.parseDouble( mEdit.getText().toString() ); |
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mEdit.setText("0"); |
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mOperation = mOp; |
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|
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} |
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} |
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|
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class SingleOperationClick implements View.OnClickListener { |
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Ops mOp; |
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public SingleOperationClick(Ops op) { |
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mOp = op; |
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} |
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|
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@Override |
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public void onClick(View v) { |
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mVal1 = Double.parseDouble( mEdit.getText().toString() ); |
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|
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double res = 0.0; |
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switch (mOp) { |
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case Sqr: |
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res = mVal1 * mVal1; |
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break; |
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case Sqrt: |
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res = Math.sqrt(mVal1); |
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break; |
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} |
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setResult(res); |
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} |
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} |
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class SumClick implements View.OnClickListener { |
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@Override |
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public void onClick(View v) { |
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if (mOperation == Ops.None) { |
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return; |
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} |
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double val2 = Double.parseDouble( mEdit.getText().toString() ); |
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double res = 0.0; |
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switch (mOperation) { |
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case Addition: |
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res = mVal1 + val2; |
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break; |
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case Subtraction: |
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res = mVal1 - val2; |
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break; |
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case Multiplication: |
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res = mVal1 * val2; |
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break; |
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case Division: |
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res = mVal1 / val2; |
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break; |
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} |
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setResult(res); |
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} |
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} |
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} |
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