1 package com.example.classtest; 2 3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.view.View; 6 import android.view.View.OnClickListener; 7 import android.widget.TextView; 8 9 public class MainActivity extends Activity implements OnClickListener { 10 private int btnIds[] = { R.id.button0, R.id.button1, R.id.button2, 11 R.id.button3, R.id.button4, R.id.button5, R.id.button6, 12 R.id.button7, R.id.button8, R.id.button9, R.id.buttonadd, 13 R.id.button1x, R.id.buttondiv, R.id.buttonequal, R.id.buttonmult, 14 R.id.buttonpoint, R.id.buttonrem, R.id.buttonsub, R.id.buttonclear }; 15 TextView textView = null; 16 String text = null; 17 18 @Override 19 protected void onCreate(Bundle savedInstanceState) { 20 super.onCreate(savedInstanceState); 21 setContentView(R.layout.activity_main); 22 textView = (TextView) findViewById(R.id.textView1); 23 24 for (int id : btnIds) { 25 findViewById(id).setOnClickListener(this); 26 27 } 28 } 29 30 @Override 31 public void onClick(View v) { 32 // TODO Auto-generated method stub 33 text = textView.getText().toString(); 34 System.out.println(v.getId()); 35 switch (v.getId()) { 36 case R.id.buttonclear: 37 text = ""; 38 break; 39 case R.id.button0: 40 text += 0; 41 break; 42 case R.id.button1: 43 text += 1; 44 break; 45 case R.id.button2: 46 text += 2; 47 break; 48 case R.id.button3: 49 text += 3; 50 break; 51 case R.id.button4: 52 text += 4; 53 break; 54 case R.id.button5: 55 text += 5; 56 break; 57 case R.id.button6: 58 text += 6; 59 break; 60 case R.id.button7: 61 text += 7; 62 break; 63 case R.id.button8: 64 text += 8; 65 break; 66 case R.id.button9: 67 text += 9; 68 break; 69 case R.id.buttonadd: 70 handle(); 71 text += "+"; 72 break; 73 case R.id.buttondiv: 74 handle(); 75 text += "/"; 76 break; 77 case R.id.buttonmult: 78 handle(); 79 text += "*"; 80 break; 81 case R.id.buttonpoint: 82 handle(); 83 text += "."; 84 break; 85 case R.id.buttonrem: 86 handle(); 87 text += "%"; 88 break; 89 case R.id.buttonsub: 90 handle(); 91 text += "-"; 92 break; 93 case R.id.button1x: 94 handle(); 95 text = (Float) (1 / Float.parseFloat(text)) + ""; 96 break; 97 case R.id.buttonequal: 98 handle(); 99 break; 100 } 101 textView.setText(text); 102 } 103 104 private void handle() { 105 int point = -1; 106 try { 107 if ((point = text.indexOf("+")) != -1) { 108 text = (Float.parseFloat(text.substring(0, point)) + Float 109 .parseFloat(text.substring(point + 1))) + ""; 110 } else if ((point = text.indexOf("-")) != -1) { 111 text = (Float.parseFloat(text.substring(0, point)) - Float 112 .parseFloat(text.substring(point + 1))) + ""; 113 } else if ((point = text.indexOf("*")) != -1) { 114 text = (Float.parseFloat(text.substring(0, point)) * Float 115 .parseFloat(text.substring(point + 1))) + ""; 116 } else if ((point = text.indexOf("/")) != -1) { 117 text = (Float.parseFloat(text.substring(0, point)) / Float 118 .parseFloat(text.substring(point + 1))) + ""; 119 } else if ((point = text.indexOf("%")) != -1) { 120 text = (Float.parseFloat(text.substring(0, point)) % Float 121 .parseFloat(text.substring(point + 1))) + ""; 122 } 123 } catch (Exception e) { 124 System.err.println(e.getMessage()); 125 } 126 } 127 }
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="fill_parent" 4 android:layout_height="fill_parent" 5 tools:context=".MainActivity" > 6 7 <GridLayout 8 android:layout_width="match_parent" 9 android:layout_height="wrap_content" 10 android:layout_alignParentLeft="true" 11 android:layout_alignParentTop="true" 12 android:columnCount="5" 13 android:rowCount="6" > 14 15 <TextView 16 android:id="@+id/textView1" 17 android:layout_column="0" 18 android:layout_row="0" 19 android:textSize="50sp" 20 android:layout_columnSpan="5" 21 android:layout_gravity="fill_horizontal" 22 android:textAppearance="?android:attr/textAppearanceLarge" /> 23 24 <Button 25 android:id="@+id/button7" 26 android:layout_column="0" 27 android:layout_row="1" 28 android:text="7" /> 29 30 <Button 31 android:id="@+id/button8" 32 android:layout_column="1" 33 android:layout_row="1" 34 android:text="8" /> 35 36 37 <Button 38 android:id="@+id/button9" 39 android:layout_column="2" 40 android:layout_row="1" 41 android:text="9" /> 42 43 <Button 44 android:id="@+id/buttondiv" 45 android:layout_column="3" 46 android:layout_row="1" 47 android:text="/" /> 48 <Button 49 android:id="@+id/buttonrem" 50 android:layout_column="4" 51 android:layout_row="1" 52 android:text="%" /> 53 54 <!--2 --> 55 56 <Button 57 android:id="@+id/button4" 58 android:layout_column="0" 59 android:layout_row="2" 60 android:text="4" /> 61 62 <Button 63 android:id="@+id/button5" 64 android:layout_column="1" 65 android:layout_row="2" 66 android:text="5" /> 67 68 69 <Button 70 android:id="@+id/button6" 71 android:layout_column="2" 72 android:layout_row="2" 73 android:text="6" /> 74 75 <Button 76 android:id="@+id/buttonmult" 77 android:layout_column="3" 78 android:layout_row="2" 79 android:text="*" /> 80 <Button 81 android:id="@+id/button1x" 82 android:layout_column="4" 83 android:layout_row="2" 84 android:text="1/x" /> 85 <!--3 --> 86 <Button 87 android:id="@+id/button1" 88 android:layout_column="0" 89 android:layout_row="3" 90 android:text="1" /> 91 92 <Button 93 android:id="@+id/button2" 94 android:layout_column="1" 95 android:layout_row="3" 96 android:text="2" /> 97 98 99 <Button 100 android:id="@+id/button3" 101 android:layout_column="2" 102 android:layout_row="3" 103 android:text="3" /> 104 105 <Button 106 android:id="@+id/buttonsub" 107 android:layout_column="3" 108 android:layout_row="3" 109 android:text="-" /> 110 <Button 111 android:id="@+id/buttonequal" 112 android:layout_column="4" 113 android:layout_row="3" 114 android:layout_rowSpan="2" 115 android:layout_gravity="fill_vertical" 116 android:text="=" /> 117 <!--4 --> 118 <Button 119 android:id="@+id/button0" 120 android:layout_columnSpan="2" 121 android:layout_gravity="fill_horizontal" 122 android:layout_column="0" 123 android:layout_row="4" 124 android:text="0" /> 125 126 <Button 127 android:id="@+id/buttonpoint" 128 android:layout_column="2" 129 android:layout_row="4" 130 android:text="." /> 131 132 133 <Button 134 android:id="@+id/buttonadd" 135 android:layout_column="3" 136 android:layout_row="4" 137 android:text="+" /> 138 <Button 139 android:id="@+id/buttonclear" 140 android:layout_column="0" 141 android:layout_row="5" 142 android:text="清零" /> 143 144 </GridLayout> 145 146 </RelativeLayout>
GridLayout特殊属性：
android:columnCount="5" 声明列数
android:rowCount="6" 声明行数
android:layout_columnSpan：占列（常和 android:layout_gravity="fill_horizontal"一起使用）
android:layout_rowSpan：占行（常和 android:layout_gravity="fill_vertical"一起使用）