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> <br> <p></p> <pre></pre>
