每天2个android小例子----简单计算器源代码

通过Android4.0 网格布局GridLayout来实现一个简单的计算器界面布局

  1 package com.android.xiong.gridlayoutTest;

  2 

  3 import java.math.BigDecimal;

  4 import java.util.regex.Pattern;

  5 

  6 import com.android.xiong.gridlayoutTest.R.id;

  7 

  8 import android.os.Bundle;

  9 import android.app.Activity;

 10 import android.view.Menu;

 11 import android.view.View;

 12 import android.view.View.OnClickListener;

 13 import android.widget.Button;

 14 import android.widget.EditText;

 15 import android.widget.GridLayout;

 16 import android.widget.TextView;

 17 

 18 public class MainActivity extends Activity {

 19 

 20     private EditText print;

 21 

 22     private static String fistNumber = "0";// 第一次输入的值

 23     private static String secondNumber = "0";// 第二次输入的值

 24     private static String num = "0";// 显示的结果

 25     private static int flg = 0;// 结果累加一次

 26     public Counts take = null;

 27 

 28     private int[] btidTake = { R.id.txtdivide, R.id.txtx, R.id.txtmin,

 29             R.id.txttakesum };

 30 

 31     private Button[] buttonTake = new Button[btidTake.length];

 32 

 33     private int[] btidNum = { R.id.txt0, R.id.txt1, R.id.txt2, R.id.txt3,

 34             R.id.txt4, R.id.txt5, R.id.txt6, R.id.txt7, R.id.txt8, R.id.txt9,

 35             R.id.txtspl };

 36     private Button[] buttons = new Button[btidNum.length];

 37 

 38     private int[] btcl = { R.id.chars, R.id.charx, R.id.txtb, R.id.txtv };

 39     private Button[] btcls = new Button[btcl.length];

 40     private GridLayout gly;

 41 

 42     @Override

 43     protected void onCreate(Bundle savedInstanceState) {

 44         super.onCreate(savedInstanceState);

 45         setContentView(R.layout.activity_main);

 46         gly=(GridLayout)findViewById(R.id.gly);

 47         print = (EditText) findViewById(R.id.print);

 48         print.setText("0");

 49         print.setEnabled(false);

 50         GetNumber get = new GetNumber();

 51         for (int i = 0; i < btidNum.length; i++) {

 52             buttons[i] = (Button) findViewById(btidNum[i]);

 53             buttons[i].setOnClickListener(get);

 54         }

 55         Compute cm = new Compute();

 56         for (int i = 0; i < btidTake.length; i++) {

 57             buttonTake[i] = (Button) findViewById(btidTake[i]);

 58             buttonTake[i].setOnClickListener(cm);

 59         }

 60 

 61         Button eq = (Button) findViewById(R.id.txteq);

 62 

 63         eq.setOnClickListener(new OnClickListener() {

 64             @Override

 65             public void onClick(View v) {

 66                 if (flg == 0) {

 67                     secondNumber = print.getText().toString();

 68                     if (take == Counts.DIVIDE && secondNumber.equals("0")) {

 69                         print.setText("0不能为被除数");

 70                     } else {

 71                         num = take.Values(fistNumber, secondNumber);

 72                         fistNumber = num;

 73                         secondNumber = "0";

 74                         print.setText(num);

 75                         flg = 1;

 76                         gly.setBackgroundResource(R.drawable.jz);

 77                     }

 78                 }

 79             }

 80         });

 81         Button cleargo = (Button) findViewById(R.id.cleargo);

 82         cleargo.setOnClickListener(new OnClickListener() {

 83             @Override

 84             public void onClick(View v) {

 85                 // TODO Auto-generated method stub

 86                 if (num.length() > 1) {

 87                     num = num.substring(0, num.length() - 1);

 88                 } else {

 89                     num = "0";

 90                 }

 91                 print.setText(num);

 92             }

 93         });

 94         Button clear = (Button) findViewById(R.id.clear);

 95         clear.setOnClickListener(new OnClickListener() {

 96 

 97             @Override

 98             public void onClick(View v) {

 99                 // TODO Auto-generated method stub

100                 num = "0";

101                 fistNumber = secondNumber = num;

102                 print.setText(num);

103                 flg = 0;

104             }

105         });

106         for (int i = 0; i < btcl.length; i++) {

107             btcls[i] = (Button) findViewById(btcl[i]);

108             btcls[i].setOnClickListener(new OnTake());

109         }

110     }

111 

112     // 给 EditText赋值

113     class GetNumber implements OnClickListener {

114 

115         @Override

116         public void onClick(View v) {

117             // TODO Auto-generated method stub

118             if (flg == 1)

119                 num = "0";

120             if (num.equals("0")) {

121                 print.setText("");

122                 num = v.getId() == R.id.txtspl ? "0" : "";

123             }

124             String txt = ((Button) v).getText().toString();

125             boolean s = Pattern.matches("-*(\\d+).?(\\d)*", num + txt);

126             num = s ? (num + txt) : num;

127             gly.setBackgroundResource(R.drawable.js);

128             print.setText(num);

129         }

130     }

131 

132     // 根据条件计算

133     class Compute implements OnClickListener {

134 

135         @Override

136         public void onClick(View arg0) {

137 

138             fistNumber = print.getText().toString();

139             // TODO Auto-generated method stub

140             switch (arg0.getId()) {

141             case R.id.txttakesum:

142                 take = Counts.ADD;

143                 break;

144             case R.id.txtmin:

145                 take = Counts.MINUS;

146                 break;

147             case R.id.txtx:

148                 take = Counts.MULTIPLY;

149                 break;

150             case R.id.txtdivide:

151                 take = Counts.DIVIDE;

152                 break;

153             }

154             num = "0";

155             flg = 0;

156             gly.setBackgroundResource(R.drawable.js);

157         }

158 

159     }

160 

161     class OnTake implements OnClickListener {

162 

163         @Override

164         public void onClick(View v) {

165             // TODO Auto-generated method stub

166             switch (v.getId()) {

167             case R.id.chars:

168                 num = "-" + num;

169                 break;

170             case R.id.charx:

171                 if(!num.equals("0"))

172                 num = BigDecimal.valueOf(1).divide(new BigDecimal(num),12,BigDecimal.ROUND_UP).stripTrailingZeros()

173                         .toString();        

174                 break;

175             case R.id.txtb:

176                 num = new BigDecimal(num).divide(BigDecimal.valueOf(100),12,BigDecimal.ROUND_UP).stripTrailingZeros()

177                         .toString();

178                 break;

179             case R.id.txtv:

180                 Double numss = Math.sqrt(new BigDecimal(num).doubleValue());

181                 int stratindex=numss.toString().contains(".")?numss.toString().indexOf("."):0;

182                 num = numss.toString().length()>13?numss.toString().substring(0, 12+stratindex):numss.toString();

183             }

184             print.setText(num);

185             flg=0;

186             num = "0";

187 

188         }

189 

190     }

191 

192     @Override

193     public boolean onCreateOptionsMenu(Menu menu) {

194         // Inflate the menu; this adds items to the action bar if it is present.

195         getMenuInflater().inflate(R.menu.main, menu);

196         return true;

197     }

198 

199 }

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_marginTop="40px"

    android:columnCount="5"

    android:rowCount="6"

    tools:context=".MainActivity" >



    <EditText

        android:id="@+id/print"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_columnSpan="5"

        android:layout_marginLeft="2px"

        android:layout_marginRight="2px"

        android:layout_row="0"

        android:background="#eee" />



    <Button

        android:id="@+id/cleargo"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="0"

        android:layout_row="1"

        android:text="《--" />



    <Button

        android:id="@+id/clear"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="3"

        android:layout_columnSpan="2"

        android:layout_row="1"

        android:layout_gravity="fill_horizontal"

        android:text="清屏" />



    <Button

        android:id="@+id/chars"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="1"

        android:layout_row="1"

        android:text="-/+" />



    <Button

        android:id="@+id/charx"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="2"

        android:layout_row="1"

        android:text="1/x" />



    <Button

        android:id="@+id/txt7"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="0"

        android:layout_row="2"

        android:text="7" />



    <Button

        android:id="@+id/txt8"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="1"

        android:layout_row="2"

        android:text="8" />



    <Button

        android:id="@+id/txt9"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="2"

        android:layout_row="2"

        android:text="9" />



    <Button

        android:id="@+id/txtdivide"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="3"

        android:layout_row="2"

        android:text="÷" />



    <Button

        android:id="@+id/txtb"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="4"

        android:layout_row="2"

        android:text="%" />



    <Button

        android:id="@+id/txt4"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="0"

        android:layout_row="3"

        android:text="4" />



    <Button

        android:id="@+id/txt5"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="1"

        android:layout_row="3"

        android:text="5" />



    <Button

        android:id="@+id/txt6"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="2"

        android:layout_row="3"

        android:text="6" />



    <Button

        android:id="@+id/txtx"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="3"

        android:layout_row="3"

        android:text="X" />



    <Button

        android:id="@+id/txtv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="4"

        android:layout_row="3"

        android:text="√" />



    <Button

        android:id="@+id/txt1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="0"

        android:layout_row="4"

        android:text="1" />



    <Button

        android:id="@+id/txt2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="1"

        android:layout_row="4"

        android:text="2" />



    <Button

        android:id="@+id/txt3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="2"

        android:layout_row="4"

        android:text="3" />



    <Button

        android:id="@+id/txtmin"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="3"

        android:layout_row="4"

        android:text="-" />



    <Button

        android:id="@+id/txteq"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="4"

        android:layout_gravity="fill_vertical"

        android:layout_row="4"

        android:layout_rowSpan="2"

        android:text="=" />



    <Button

        android:id="@+id/txt0"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="0"

        android:layout_columnSpan="2"

        android:layout_gravity="fill_horizontal"

        android:layout_row="5"

        android:text="0" />



    <Button

        android:id="@+id/txtspl"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="2"

        android:layout_row="5"

        android:text="." />



    <Button

        android:id="@+id/txttakesum"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_column="3"

        android:layout_row="5"

        android:text="+" />



</GridLayout></pre><br>

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