上個例子我做了個簡單的計算器，現在抽空弄個了複雜點的。 具體步驟如下：
先看效果：點擊96*96=9216，其他運算一樣，我這裏就不一一截圖了！
96 * 96 == 9216
點擊菜單按鈕後： 點擊關於選項後：
一、xml代碼，main.xml代碼如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="大明原創"
/>
<EditText
android:id="@+id/showText"
android:layout_width="150px"
android:layout_height="38px"
/>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<Button
android:id="@+id/num1"
android:layout_width="38px"
android:layout_height="38px"
android:text="1"
/>
<Button
android:id="@+id/num2"
android:layout_width="38px"
android:layout_height="38px"
android:text="2"
/>
<Button
android:id="@+id/num3"
android:layout_width="38px"
android:layout_height="38px"
android:text="3"
/>
<Button
android:id="@+id/add"
android:layout_width="38px"
android:layout_height="38px"
android:text="+"
/>
</TableRow>
<TableRow>
<Button
android:id="@+id/num4"
android:layout_width="38px"
android:layout_height="38px"
android:text="4"
/>
<Button
android:id="@+id/num5"
android:layout_width="38px"
android:layout_height="38px"
android:text="5"
/>
<Button
android:id="@+id/num6"
android:layout_width="38px"
android:layout_height="38px"
android:text="6"
/>
<Button
android:id="@+id/jian"
android:layout_width="38px"
android:layout_height="38px"
android:text="-"
/>
</TableRow>
<TableRow>
<Button
android:id="@+id/num7"
android:layout_width="38px"
android:layout_height="38px"
android:text="7"
/>
<Button
android:id="@+id/num8"
android:layout_width="38px"
android:layout_height="38px"
android:text="8"
/>
<Button
android:id="@+id/num9"
android:layout_width="38px"
android:layout_height="38px"
android:text="9"
/>
<Button
android:id="@+id/cheng"
android:layout_width="38px"
android:layout_height="38px"
android:text="*"
/>
</TableRow>
<TableRow>
<Button
android:id="@+id/zero"
android:layout_width="38px"
android:layout_height="38px"
android:text="0"
/>
<Button
android:id="@+id/modi"
android:layout_width="38px"
android:layout_height="38px"
android:text="+/-"
/>
<Button
android:id="@+id/point"
android:layout_width="38px"
android:layout_height="38px"
android:text="."
/>
<Button
android:id="@+id/chu"
android:layout_width="38px"
android:layout_height="38px"
android:text="/"
/>
</TableRow>
<TableRow>
</TableRow>
</TableLayout>
</TableRow>
<TableRow>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<Button
android:id="@+id/ce"
android:layout_width="76px"
android:layout_height="40px"
android:text="CE"
/>
<Button
android:id="@+id/result"
android:layout_width="76px"
android:layout_height="40px"
android:text="=="
/>
</TableRow>
</TableLayout>
</TableRow>
</TableLayout>
</LinearLayout>
二、MainActivity.java中的代碼：
package com.cn.android;
import android.app.Activity;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
private Vibrator vibrator;
private Double num_a;
private Double num_b;
private String temp = null;// 計算符號
private boolean isDot = true;// 小數點控制
private boolean clickable = true;// 標誌是否按過計算按鈕
private double memoryd; // 使用內存中存儲的數字
private EditText text = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button num1 = (Button)findViewById(R.id.num1);
final Button num2 = (Button)findViewById(R.id.num2);
final Button num3 = (Button)findViewById(R.id.num3);
final Button num4 = (Button)findViewById(R.id.num4);
final Button num5 = (Button)findViewById(R.id.num5);
final Button num6 = (Button)findViewById(R.id.num6);
final Button num7 = (Button)findViewById(R.id.num7);
final Button num8 = (Button)findViewById(R.id.num8);
final Button num9 = (Button)findViewById(R.id.num9);
Button num0 = (Button)findViewById(R.id.zero);
Button add = (Button)findViewById(R.id.add);//加
Button sub = (Button)findViewById(R.id.jian);//減
Button mul = (Button)findViewById(R.id.cheng);//乘
Button div = (Button)findViewById(R.id.chu);//除
Button point = (Button)findViewById(R.id.point);//小數點
Button ce = (Button)findViewById(R.id.ce);//清零
Button equal = (Button)findViewById(R.id.result);//等於
Button tf = (Button)findViewById(R.id.modi);//取反
text = (EditText)findViewById(R.id.showText);
// 0
num0.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if (text.getText().toString().equalsIgnoreCase("0")) {
} else {
if (clickable == false) {
text.setText("");
text.setText(text.getText().toString() + "0");
clickable = true;
} else {
text.setText(text.getText().toString() + "0");
}
}
}
});
//1
num1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String str1 = num1.getText().toString();
show(str1);
}
});
// 2
num2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num2.getText().toString());
}
});
// 3
num3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num3.getText().toString());
}
});
// 4
num4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num4.getText().toString());
}
});
// 5
num5.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num5.getText().toString());
}
});
// 6
num6.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num6.getText().toString());
}
});
// 7
num7.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num7.getText().toString());
}
});
// 8
num8.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num8.getText().toString());
}
});
// 9
num9.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
show(num9.getText().toString());
}
});
// .小數點
point.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
if (text.getText().toString() != "" && isDot == true) {
text.setText(text.getText() + ".");
isDot = false;
} else {
text.setText(text.getText().toString());
}
}
}
});
// 加
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
if (text.getText() != null) {
num_a = Double.parseDouble(text.getText().toString());
temp = "add";
clickable = false;
isDot = true;
text.setText(text.getText().toString()+"＋");
}
}
}
});
// 減
sub.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
if (text.getText() != null) {
num_a = Double.parseDouble(text.getText().toString());
temp = "sub";
clickable = false;
text.setText(text.getText().toString()+"—");
} else {
text.setText(text.getText().toString()+"—");
}
isDot = true;
}
}
});
// 乘
mul.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
if (text.getText() != null) {
num_a = Double.parseDouble(text.getText().toString());
temp = "mul";
text.setText(text.getText().toString()+"×");
clickable = false;
isDot = true;
}
}
}
});
// 除
div.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
if (text.getText() != null) {
num_a = Double.parseDouble(text.getText().toString());
temp = "div";
text.setText(text.getText().toString()+"÷");
clickable = false;
isDot = true;
}
}
}
});
// 等於
equal.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (temp != null && text.getText() != null) {
num_b = (Double.parseDouble(text.getText().toString()));
if (temp == "add") {
text.setText(Float.toString((float) (num_a + num_b)));
temp = null;
} else if (temp == "sub") {
text.setText(Float.toString((float) (num_a - num_b)));
temp = null;
} else if (temp == "mul") {
text.setText(Float.toString((float) (num_a * num_b)));
temp = null;
} else if (temp == "div") {
text.setText(Float.toString((float) (num_a / num_b)));
temp = null;
}
clickable = false;
if (text.getText().toString() == "") {
isDot = true;
} else {
isDot = false;
}
}
}
});
// 取反
tf.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
if (text.getText().toString().equalsIgnoreCase("")) {
} else {
boolean isNumber = true;
String s = text.getText().toString();
for (int i = 0; i < s.length(); i++)
if (!(s.charAt(i) >= '0' && s.charAt(i) <= '9'
|| s.charAt(i) == '.' || s.charAt(i) == '-')) {
isNumber = false;
break;
}
if (isNumber == true) {
// 如果當前字符串首字母有'-'號,代表現在是個負數,再按下時,則將首符號去掉
if (s.charAt(0) == '-') {
text.setText("");
for (int i = 1; i < s.length(); i++) {
char a = s.charAt(i);
text.setText(text.getText().toString() + a);
}
}
// 如果當前字符串第一個字符不是符號，則添加一個符號在首字母處
else
text.setText('-' + s);
}
}
}
});
// 清零
ce.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
text.setText("");
num_a = 0.0;
temp = null;
clickable = false;
isDot = true;
}
});
}
public void show(String i) { // 1-9的數
if(i==null){
System.out.println("wrong message!");
}
// zd();
if (clickable == false) {
text.setText("");
text.setText(text.getText() + i);
clickable = true;
} else {
text.setText(text.getText() + i);
}
}
public boolean onOptionsItemSelected(MenuItem item) { // 設置菜單事件
if (item.getItemId() == 1) {
finish();
}
else {
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("關於")
.setMessage(
"This is a better jisuanqi!\nBy：daming\nQQ：544725635")
.show();
}
return super.onOptionsItemSelected(item);
}
}
三、 多國語言支持，支持中文和英文
（1）values中的strings.xml的代碼
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainActivity!</string>
<string name="app_name">jsq by daming</string>
<string name="exit">exit</string>
<string name="about">about</string>
</resources>
（2）values-zh-rCN中的strings.xml的代碼
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">大名原創計算器</string>
<string name="exit">退出</string>
<string name="about">關於</string>
</resources>
四、這是簡單的實現了一下計算器，裏面有的判斷沒有添加，到時候讀者可以自己加判斷進行處理，如果有問題，可以發郵件討論：[email protected]。有更好的計算器也可以發給我，大家共同學習，共同提高，我會繼續完善我的計算器的！