1.string.xml代码
1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3 4 <string name="hello">Hello World, CalculatorActivity!</string> 5 <string name="app_name">计算器</string> 6 <string name="zero">0</string> 7 <string name="one">1</string> 8 <string name="two">2</string> 9 <string name="three">3</string> 10 <string name="four">4</string> 11 <string name="five">5</string> 12 <string name="six">6</string> 13 <string name="seven">7</string> 14 <string name="eight">8</string> 15 <string name="nine">9</string> 16 17 <string name="add">+</string> 18 <string name="cut">-</string> 19 <string name="multiply">×</string> 20 <string name="divide">÷</string> 21 <string name="spot">.</string> 22 <string name="equal">=</string> 23 <string name="reset">清除</string> 24 25 </resources>
2.main.xml 布局代码
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="fill_parent" 4 android:layout_height="fill_parent" 5 android:orientation="vertical" > 6 7 <EditText 8 android:id="@+id/text" 9 android:layout_width="fill_parent" 10 android:layout_height="130dp" 11 android:textSize="45sp" 12 android:maxLength="10" 13 android:textColor="#FFF" 14 android:layout_gravity="center" 15 android:cursorVisible="false" 16 android:gravity="right" 17 /> 18 19 <TableLayout 20 android:id="@+id/tablelayout" 21 android:layout_width="fill_parent" 22 android:layout_height="wrap_content" > 23 24 <LinearLayout 25 android:layout_width="fill_parent" 26 android:layout_height="fill_parent" > 27 28 <Button 29 android:layout_width="240dp" 30 android:layout_height="60dp" 31 android:background="#222" 32 android:textColor="#FFF" 33 android:text="" /> 34 35 <Button 36 android:layout_width="80dp" 37 android:layout_height="60dp" 38 android:textColor="#FFF" 39 android:text="@string/reset" 40 android:id="@+id/reset" 41 /> 42 </LinearLayout> 43 44 <LinearLayout 45 android:layout_width="fill_parent" 46 android:layout_height="fill_parent" > 47 48 <Button 49 android:layout_width="80dp" 50 android:layout_height="wrap_content" 51 android:textSize="40sp" 52 android:textColor="#FFF" 53 android:text="@string/seven" 54 android:id="@+id/seven"/> 55 56 <Button 57 android:layout_width="80dp" 58 android:layout_height="wrap_content" 59 android:textSize="40sp" 60 android:textColor="#FFF" 61 android:text="@string/eight" 62 android:id="@+id/eight"/> 63 64 <Button 65 android:layout_width="80dp" 66 android:layout_height="wrap_content" 67 android:textSize="40sp" 68 android:textColor="#FFF" 69 android:text="@string/nine" 70 android:id="@+id/nine" /> 71 72 <Button 73 android:layout_width="80dp" 74 android:layout_height="fill_parent" 75 android:textSize="40sp" 76 android:textColor="#FFF" 77 android:text="@string/divide" 78 android:id="@+id/divide" /> 79 </LinearLayout> 80 81 <LinearLayout 82 android:layout_width="fill_parent" 83 android:layout_height="fill_parent" > 84 85 <Button 86 android:layout_width="80dp" 87 android:layout_height="wrap_content" 88 android:textSize="40sp" 89 android:textColor="#FFF" 90 android:text="@string/four" 91 android:id="@+id/four" 92 /> 93 94 <Button 95 android:layout_width="80dp" 96 android:layout_height="wrap_content" 97 android:textSize="40sp" 98 android:textColor="#FFF" 99 android:text="@string/five" 100 android:id="@+id/five" 101 /> 102 103 <Button 104 android:layout_width="80dp" 105 android:layout_height="wrap_content" 106 android:textSize="40sp" 107 android:textColor="#FFF" 108 android:text="@string/six" 109 android:id="@+id/six" 110 /> 111 112 <Button 113 android:layout_width="80dp" 114 android:layout_height="fill_parent" 115 android:textSize="40sp" 116 android:textColor="#FFF" 117 android:text="@string/multiply" 118 android:id="@+id/multiply" 119 /> 120 </LinearLayout> 121 122 <LinearLayout 123 android:layout_width="fill_parent" 124 android:layout_height="fill_parent" > 125 126 <Button 127 android:layout_width="80dp" 128 android:layout_height="wrap_content" 129 android:textSize="40sp" 130 android:textColor="#FFF" 131 android:text="@string/one" 132 android:id="@+id/one" 133 /> 134 135 <Button 136 android:layout_width="80dp" 137 android:layout_height="wrap_content" 138 android:textSize="40sp" 139 android:textColor="#FFF" 140 android:text="@string/two" 141 android:id="@+id/two" 142 /> 143 144 <Button 145 android:layout_width="80dp" 146 android:layout_height="wrap_content" 147 android:textSize="40sp" 148 android:textColor="#FFF" 149 android:text="@string/three" 150 android:id="@+id/three" 151 /> 152 153 <Button 154 android:layout_width="80dp" 155 android:layout_height="fill_parent" 156 android:textSize="40sp" 157 android:textColor="#FFF" 158 android:text="@string/cut" 159 android:id="@+id/cut" 160 /> 161 </LinearLayout> 162 163 <LinearLayout 164 android:layout_width="fill_parent" 165 android:layout_height="fill_parent" > 166 167 <Button 168 android:layout_width="80dp" 169 android:layout_height="wrap_content" 170 android:textSize="40sp" 171 android:textColor="#FFF" 172 android:text="@string/spot" 173 android:id="@+id/spot" 174 /> 175 176 <Button 177 android:layout_width="80dp" 178 android:layout_height="wrap_content" 179 android:textSize="40sp" 180 android:textColor="#FFF" 181 android:text="@string/zero" 182 android:id="@+id/zero" 183 /> 184 185 <Button 186 android:layout_width="80dp" 187 android:layout_height="wrap_content" 188 android:textSize="40sp" 189 android:textColor="#FFF" 190 android:text="@string/equal" 191 android:id="@+id/equal" 192 /> 193 194 <Button 195 android:layout_width="80dp" 196 android:layout_height="fill_parent" 197 android:textSize="40sp" 198 android:textColor="#FFF" 199 android:text="@string/add" 200 android:id="@+id/add" 201 /> 202 </LinearLayout> 203 204 </TableLayout> 205 206 </LinearLayout>
3.CalculatorActivity.java 代码
1 package FosgeIT.Calculator; 2 import android.app.Activity; 3 import android.os.Bundle; 4 import android.view.View; 5 import android.view.View.OnClickListener; 6 import android.widget.Button; 7 import android.widget.TextView; 8 import android.widget.Toast; 9 10 /** 11 * 计算器 12 * 13 * @author YinRQ 2013-07-12 13:25:04 14 */ 15 16 public class CalculatorActivity extends Activity { 17 18 // 私有变量 19 private int option = 0; 20 private boolean newdigital = true; 21 private double a = 0, b = 0; 22 private Button btnOne; 23 private Button btnTwo; 24 private Button btnThree; 25 private Button btnFour; 26 private Button btnFive; 27 private Button btnSix; 28 private Button btnSeven; 29 private Button btnEight; 30 private Button btnNine; 31 private Button btnZero; 32 private Button btnAdd; 33 private Button btnCut; 34 private Button btnMultiply; 35 private Button btnDivide; 36 private Button btnEqual; 37 private Button btnSpot; 38 private Button btnReset; 39 40 @Override 41 public void onCreate(Bundle savedInstanceState) { 42 super.onCreate(savedInstanceState); 43 setContentView(R.layout.main); 44 45 // 初始化控件 46 btnOne = (Button) findViewById(R.id.one); 47 btnTwo = (Button) findViewById(R.id.two); 48 btnThree = (Button) findViewById(R.id.three); 49 btnFour = (Button) findViewById(R.id.four); 50 btnFive = (Button) findViewById(R.id.five); 51 btnSix = (Button) findViewById(R.id.six); 52 btnSeven = (Button) findViewById(R.id.seven); 53 btnEight = (Button) findViewById(R.id.eight); 54 btnNine = (Button) findViewById(R.id.nine); 55 btnZero = (Button) findViewById(R.id.zero); 56 btnAdd = (Button) findViewById(R.id.add); 57 btnCut = (Button) findViewById(R.id.cut); 58 btnMultiply = (Button) findViewById(R.id.multiply); 59 btnDivide = (Button) findViewById(R.id.divide); 60 btnEqual = (Button) findViewById(R.id.equal); 61 btnSpot = (Button) findViewById(R.id.spot); 62 btnReset = (Button) findViewById(R.id.reset); 63 64 btnOne.setOnClickListener(lisenter); 65 btnTwo.setOnClickListener(lisenter); 66 btnThree.setOnClickListener(lisenter); 67 btnFour.setOnClickListener(lisenter); 68 btnFive.setOnClickListener(lisenter); 69 btnSix.setOnClickListener(lisenter); 70 btnSeven.setOnClickListener(lisenter); 71 btnEight.setOnClickListener(lisenter); 72 btnNine.setOnClickListener(lisenter); 73 btnZero.setOnClickListener(lisenter); 74 btnAdd.setOnClickListener(lisenter); 75 btnCut.setOnClickListener(lisenter); 76 btnMultiply.setOnClickListener(lisenter); 77 btnDivide.setOnClickListener(lisenter); 78 btnEqual.setOnClickListener(lisenter); 79 btnReset.setOnClickListener(lisenter); 80 btnSpot.setOnClickListener(lisenter); 81 } 82 83 84 private OnClickListener lisenter = new OnClickListener() { 85 86 public void onClick(View v) { 87 88 TextView text = (TextView) findViewById(R.id.text); 89 String s = text.getText().toString(); 90 Button btn = (Button) v; 91 String t = (String) btn.getText(); 92 if (btn.getId() == R.id.zero || btn.getId() == R.id.one 93 || btn.getId() == R.id.two || btn.getId() == R.id.three 94 || btn.getId() == R.id.four || btn.getId() == R.id.five 95 || btn.getId() == R.id.six || btn.getId() == R.id.seven 96 || btn.getId() == R.id.eight || btn.getId() == R.id.nine) { 97 if (newdigital) { 98 text.setText(s + t); 99 } else { 100 text.setText(s); 101 newdigital = false; 102 } 103 return; 104 } 105 106 // 加 107 if (btn.getId() == R.id.add) { 108 a = Double.parseDouble(s); 109 option = 1; 110 text.setText(""); 111 return; 112 113 } 114 115 // 减 116 if (btn.getId() == R.id.cut) { 117 a = Double.parseDouble(s); 118 option = 2; 119 text.setText(""); 120 return; 121 } 122 123 // 乘 124 if (btn.getId() == R.id.multiply) { 125 a = Double.parseDouble(s); 126 option = 3; 127 text.setText(""); 128 return; 129 } 130 131 // 除 132 if (btn.getId() == R.id.divide){ 133 a = Double.parseDouble(s); 134 option = 4; 135 text.setText(""); 136 return; 137 } 138 139 // 清除 140 if (btn.getId() == R.id.reset){ 141 a = 0; 142 b = 0; 143 option = 0; 144 newdigital = true; 145 text.setText(""); 146 return; 147 } 148 149 // . 150 if (btn.getId() == R.id.spot){ 151 if (s.indexOf(".") == -1) 152 if (s.trim().startsWith("0")) { 153 text.setText("0."); 154 newdigital = true; 155 } else { 156 text.setText(s + "."); 157 158 } 159 return; 160 } 161 162 // = 163 if (btn.getId() == R.id.equal){ 164 b = Double.parseDouble(s); 165 switch (option) { 166 case 1: 167 text.setText(String.valueOf(a + b)); 168 break; 169 case 2: 170 text.setText(String.valueOf(a - b)); 171 break; 172 case 3: 173 text.setText(String.valueOf(a * b)); 174 break; 175 case 4: { 176 if (b != 0) { 177 text.setText(String.valueOf(a / b)); 178 } else { 179 Toast.makeText(CalculatorActivity.this, "除数不能为0", 180 Toast.LENGTH_SHORT).show(); 181 text.setText(""); 182 a = 0; 183 b = 0; 184 option = 0; 185 newdigital = true; 186 return; 187 } 188 break; 189 } 190 case 5: 191 text.setText(String.valueOf(Math.pow(a, b))); 192 break; 193 194 } 195 return; 196 } 197 } 198 199 }; 200 201 }
4.效果截图