這是我的第一個andriod小程序,第一次寫用了半個月,第二次修改用了一天,第三次修改用了兩個小時,現在終於比較滿意了。現在我就直接分享一下我的源代碼,由於思路比較簡單,注釋加的不多。采用的是相對布局,但是此布局只適合480*800的分辨率,更高的分辨率界面會顯示不正常,但是功能沒有任何問題,你可以嘗試用其他布局來實現界面,總之核心功能實現是不變的。
activity_main.xml文件如下:
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.test.MainActivity"
tools:ignore="MergeRootFrame"
android:padding="15dp"
android:layout_gravity="center"
android:background="#111"
>
<Button
android:id="@+id/button4"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button13"
android:layout_alignBottom="@+id/button13"
android:layout_toLeftOf="@+id/button2"
android:background="#a10b39"
android:padding="10dp"
android:text="="
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"/>
<Button
android:id="@+id/button9"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button10"
android:layout_alignBottom="@+id/button10"
android:layout_alignLeft="@+id/button6"
android:background="#666"
android:padding="10dp"
android:text="7"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_width="70dp"
android:layout_marginBottom="3dp"
/>
<Button
android:id="@+id/button11"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button10"
android:layout_alignBottom="@+id/button10"
android:layout_toRightOf="@+id/button13"
android:background="#666"
android:padding="10dp"
android:text="9"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_width="70dp"
android:layout_marginBottom="3dp"
/>
<Button
android:id="@+id/button10"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button18"
android:layout_below="@+id/button17"
android:background="#666"
android:padding="10dp"
android:text="8"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_width="70dp"
android:layout_marginBottom="3dp"
/>
<Button
android:id="@+id/button20"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_above="@+id/button14"
android:layout_alignParentRight="true"
android:background="#a10b39"
android:padding="10dp"
android:text="←"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"/>
<Button
android:id="@+id/button19"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button20"
android:layout_alignBottom="@+id/button20"
android:layout_toLeftOf="@+id/button20"
android:background="#a10b39"
android:padding="10dp"
android:text="CE"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_marginBottom="3dp"
/>
<Button
android:id="@+id/button18"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_above="@+id/button10"
android:layout_toLeftOf="@+id/button11"
android:background="#a10b39"
android:padding="10dp"
android:text="±"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_marginBottom="3dp"
/>
<Button
android:id="@+id/button17"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editText1"
android:layout_marginTop="5dp"
android:background="#a10b39"
android:padding="10dp"
android:text="√"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_marginBottom="3dp" />
<Button
android:id="@+id/button14"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/button18"
android:background="#d89218"
android:padding="10dp"
android:text="÷"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp" />
<Button
android:id="@+id/button7"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_below="@+id/button10"
android:layout_toRightOf="@+id/button6"
android:background="#666"
android:padding="10dp"
android:text="5"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="3dp"/>
<Button
android:id="@+id/button6"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button7"
android:layout_alignBottom="@+id/button7"
android:layout_alignParentLeft="true"
android:background="#666"
android:padding="10dp"
android:text="4"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:layout_marginBottom="3dp" />
<Button
android:id="@+id/button15"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button7"
android:layout_alignBottom="@+id/button7"
android:layout_alignParentRight="true"
android:background="#d89218"
android:padding="10dp"
android:text="×"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp" />
<Button
android:id="@+id/button8"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button7"
android:layout_alignBottom="@+id/button7"
android:layout_toRightOf="@+id/button10"
android:background="#666"
android:padding="10dp"
android:text="6"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="3dp" />
<Button
android:id="@+id/button3"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_below="@+id/button7"
android:layout_toRightOf="@+id/button1"
android:background="#666"
android:padding="10dp"
android:text="2"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="3dp" />
<Button
android:id="@+id/button1"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button3"
android:layout_alignBottom="@+id/button3"
android:layout_alignParentLeft="true"
android:background="#666"
android:padding="10dp"
android:text="1"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="3dp" />
<Button
android:id="@+id/button5"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button3"
android:layout_alignBottom="@+id/button3"
android:layout_toRightOf="@+id/button7"
android:background="#666"
android:padding="10dp"
android:text="3"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="3dp"/>
<Button
android:id="@+id/button16"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button5"
android:layout_alignBottom="@+id/button5"
android:layout_alignLeft="@+id/button15"
android:background="#d89218"
android:padding="10dp"
android:text="-"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginBottom="3dp" />
<Button
android:id="@+id/button2"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button4"
android:layout_alignBottom="@+id/button4"
android:layout_alignParentRight="true"
android:background="#d89218"
android:padding="10dp"
android:text="+"
android:textColor="#fff"
android:textSize="28dp" />
<Button
android:id="@+id/button13"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
android:layout_toLeftOf="@+id/button4"
android:padding="10dp"
android:text="."
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp"
android:background="#d89218" />
<Button
android:id="@+id/button12"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button13"
android:layout_alignBottom="@+id/button13"
android:layout_alignParentLeft="true"
android:background="#666"
android:padding="10dp"
android:text="0"
android:textColor="#fff"
android:textSize="28dp"
android:layout_marginRight="3dp" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/editText1"
android:background="#666"
android:text=" "
android:textColor="#fff"
android:textSize="15dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_alignLeft="@+id/button17"
android:layout_below="@+id/textView1"
android:background="#666"
android:ems="10"
android:singleLine="true"
android:textColor="#000"
android:textSize="28dp" />
</RelativeLayout>
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MainActivity.java代碼如下:
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package com.example.mycalculator;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private Button btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9,btn10,btn11,btn12,btn13,btn14,btn15,btn16,btn17,btn18,btn19,btn20;
private EditText editText;//顯示輸入的數字
private String opt = "+";//操作符
private double n1 = 0.0, n2 = 0.0;//兩個操作數
private TextView textView;//顯示算式
//跟據被選擇按鈕的id設置監聽器
private OnClickListener lisenter = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
editText = (EditText)findViewById(R.id.editText1);
textView = (TextView) findViewById(R.id.textView1);
String s = editText.getText().toString();//獲取字符串
Button btn =(Button)v;
try{
switch(btn.getId())
{
case R.id.button1://1
{
String str = editText.getText().toString();
editText.setText(str + 1);
str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button2://+
{
String str = editText.getText().toString();
n1 = Double.parseDouble(str);
opt = "+";
textView.setText(n1 + opt);
editText.setText("");
break;
}
case R.id.button3://2
{
String str = editText.getText().toString();
editText.setText(str + 2);
str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button4://操作符=
{
if(opt == "+")
{
String str = editText.getText().toString();
n2 = Double.parseDouble(str);
textView.setText(n1 + opt + n2 + "=");
editText.setText((n1 + n2) + "");
}
else if(opt == "-")
{
String str = editText.getText().toString();
n2 = Double.parseDouble(str);
textView.setText(n1 + opt + n2 + "=");
editText.setText((n1 - n2) + "");
}
else if(opt == "*")
{
String str = editText.getText().toString();
n2 = Double.parseDouble(str);
textView.setText(n1 + opt + n2 + "=");
editText.setText((n1 * n2) + "");
}
else if(opt == "/")
{
String str = editText.getText().toString();
n2 = Double.parseDouble(str);
if(n2 == 0)
{
editText.setText("");
textView.setText("除數不能為0");
break;
}
else
{
textView.setText(n1 + opt + n2 + "=");
editText.setText((n1 / n2) + "");
}
}
break;
}
case R.id.button5://3
{
editText.setText(editText.getText().toString() + 3);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button6://4
{
editText.setText(editText.getText().toString() + 4);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button7://5
{
editText.setText(editText.getText().toString() + 5);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button8://6
{
editText.setText(editText.getText().toString() + 6);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button9://7
{
editText.setText(editText.getText().toString() + 7);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button10://8
{
editText.setText(editText.getText().toString() + 8);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button11://9
{
editText.setText(editText.getText().toString() + 9);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button12://0
{
textView.setText(n1 + opt + 10);
editText.setText(editText.getText().toString() + 0);
String str = editText.getText().toString();
textView.setText(str);
break;
}
case R.id.button13://.
{
String str = editText.getText().toString();
if(str.indexOf(".") != -1) //判斷字符串中是否已經包含了小數點,如果有就什麼也不做
{
}
else //如果沒有小數點
{
if(str.equals("0"))//如果開始為0,
editText.setText(("0" + ".").toString());
else if(str.equals(""))//如果初時顯示為空,就什麼也不做
{
}
else
editText.setText(str + ".");
}
break;
}
case R.id.button14://操作符 /
{
String str = editText.getText().toString();
n1 = Double.parseDouble(str);
opt = "/";
editText.setText("");
textView.setText(n1 + opt);
break;
}
case R.id.button15://操作符*
{
String str = editText.getText().toString();
n1 = Double.parseDouble(str);
opt = "*";
editText.setText("");
textView.setText(n1 + opt);
break;
}
case R.id.button16://操作符-
{
String str = editText.getText().toString();
n1 = Double.parseDouble(str);
opt = "-";
editText.setText("");
textView.setText(n1 + opt);
break;
}
case R.id.button17://genhao
{
String str = editText.getText().toString();
n1 = Double.parseDouble(str);
editText.setText(Math.sqrt(n1) + "");
textView.setText(n1 + "的平方根是");
break;
}
case R.id.button18://+/-
{
String str =editText.getText().toString();
n1 = Double.parseDouble(str);
if(str.length() > 0)
editText.setText(-n1 + "");
textView.setText(-n1 + "");
break;
}
case R.id.button19://CE
{
String str =editText.getText().toString();
if(str.length() > 0)
editText.setText("");
break;
}
case R.id.button20://<-
{
String str =editText.getText().toString();
if(str.length() > 0)
editText.setText(str.substring(0, str.length() - 1));
break;
}
}
}catch(Exception e){}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
//獲取按鈕的id
btn1 = (Button) findViewById(R.id.button1);
btn2 = (Button) findViewById(R.id.button2);
btn3 = (Button) findViewById(R.id.button3);
btn4 = (Button) findViewById(R.id.button4);
btn5 = (Button) findViewById(R.id.button5);
btn6= (Button) findViewById(R.id.button6);
btn7 = (Button) findViewById(R.id.button7);
btn8 = (Button) findViewById(R.id.button8);
btn9 = (Button) findViewById(R.id.button9);
btn10 = (Button) findViewById(R.id.button10);
btn11 = (Button) findViewById(R.id.button11);
btn12 = (Button) findViewById(R.id.button12);
btn13 = (Button) findViewById(R.id.button13);
btn14 = (Button) findViewById(R.id.button14);
btn15 = (Button) findViewById(R.id.button15);
btn16 = (Button) findViewById(R.id.button16);
btn17 = (Button) findViewById(R.id.button17);
btn18 = (Button) findViewById(R.id.button18);
btn19 = (Button) findViewById(R.id.button19);
btn20 = (Button) findViewById(R.id.button20);
//為按鈕添加監聽器
btn1.setOnClickListener(lisenter);
btn2.setOnClickListener(lisenter);
btn3.setOnClickListener(lisenter);
btn4.setOnClickListener(lisenter);
btn5.setOnClickListener(lisenter);
btn6.setOnClickListener(lisenter);
btn7.setOnClickListener(lisenter);
btn8.setOnClickListener(lisenter);
btn9.setOnClickListener(lisenter);
btn10.setOnClickListener(lisenter);
btn11.setOnClickListener(lisenter);
btn12.setOnClickListener(lisenter);
btn13.setOnClickListener(lisenter);
btn14.setOnClickListener(lisenter);
btn15.setOnClickListener(lisenter);
btn16.setOnClickListener(lisenter);
btn17.setOnClickListener(lisenter);
btn18.setOnClickListener(lisenter);
btn19.setOnClickListener(lisenter);
btn20.setOnClickListener(lisenter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}