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Carmella Douglas
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1 Problem :Toy Calculator Description:Please design an Android application that contains 2 activities: cal_main and cal_result. The following figure is a suggested layout for the cal_main activity. For the cal_result activity, you could develop your own layout that contains at least 1 TextView for displaying computation result and 1 Button for returning to the cal_main activity. Hints:Please refer to EX03_09 and EX03_10 for learning how to execute activities within an activity and how to pass parameters between activities. 程式碼 : EX_10.java package irdc.ex03_10; import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.radiobutton; public class EX03_10 extends public void oncreate(bundle savedinstancestate) super.oncreate(savedinstancestate); setcontentview(r.layout.main); Button b1 = (Button) findviewbyid(r.id.button1); b1.setonclicklistener(new Button.OnClickListener() public void onclick(view v) EditText et_op1 = (EditText) findviewbyid(r.id.operant1); double operant1=double.parsedouble(et_op1.gettext().tostring()); EditText et_op2 = (EditText) findviewbyid(r.id.operant2); double operant2=double.parsedouble(et_op2.gettext().tostring()); String op=""; RadioButton rb1 = (RadioButton) findviewbyid(r.id.op1); RadioButton rb2 = (RadioButton) findviewbyid(r.id.op2); RadioButton rb3 = (RadioButton) findviewbyid(r.id.op3); RadioButton rb4 = (RadioButton) findviewbyid(r.id.op4); if(rb1.ischecked()) op="+"; else if(rb2.ischecked())

2 op="-"; else if(rb3.ischecked()) op="*"; else op="/"; Intent intent = new Intent(); intent.setclass(ex03_10.this,ex03_10_1.class); Bundle bundle = new Bundle(); bundle.putdouble("operant1",operant1); bundle.putdouble("operant2",operant2); bundle.putstring("op",op); intent.putextras(bundle); startactivity(intent); );

3 EX_10_1.java package irdc.ex03_10; import java.text.decimalformat; import java.text.numberformat; import android.app.activity; import android.os.bundle; import android.widget.textview; public class EX03_10_1 extends public void oncreate(bundle savedinstancestate) super.oncreate(savedinstancestate); setcontentview(r.layout.myalyout); Bundle bunde = this.getintent().getextras(); String op = bunde.getstring("op"); double operant1 = bunde.getdouble("operant1"); double operant2 = bunde.getdouble("operant2"); String weight=this.getweight(op, operant1,operant2); TextView tv1=(textview) findviewbyid(r.id.text1); tv1.settext(" 運算結果 "+weight); private String format(double num) NumberFormat formatter = new DecimalFormat("0.00"); String s=formatter.format(num); return s; private String getweight(string op,double operant1,double operant2) String weight=""; if(op.equals("+")) weight=format(operant1+operant2); else if (op.equals("-")) weight=format(operant1-operant2); else if (op.equals("*")) weight=format(operant1*operant2); else if (op.equals("/")) weight=format(operant1/operant2); return weight;

4 main.xml(ex03_10/res/layout) <?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android=" > android:layout_width="243px" android:layout_height="29px" android:layout_x="96px" android:layout_y="50px" android:layout_height="37px" android:layout_x="20px" android:layout_y="180px" android:layout_height="37px" android:layout_x="20px" android:layout_y="110px" android:layout_x="20px" android:layout_y="250px" <Button android:layout_width="100px" android:layout_height="48px" android:text="compute"

5 android:layout_x="110px" android:layout_y="310px" <RadioGroup android:layout_width="300px" android:layout_height="100px" android:layout_x="97px" android:layout_y="98px" android:orientation="horizontal" android:visibility="visible" > <RadioButton android:text="+" <RadioButton android:text="-" <RadioButton android:text="*" <RadioButton android:text="/" </RadioGroup> <EditText android:layout_width="130px" android:layout_x="96px" android:layout_y="170px" android:numeric="decimal" <EditText android:layout_width="130px" android:layout_x="96px" android:layout_y="240px"

6 android:numeric="decimal" </AbsoluteLayout> mylayout.xml(ex03_10/res/layout) <?xml version="1.0" encoding="utf-8"?>

7 <AbsoluteLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android=" > android:textsize="20sp" android:layout_x="50px" android:layout_y="72px" </AbsoluteLayout> strings.xml(ex03_10/res/values)

8 <?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">ex03_10</string> <string name="title">toy Calculator</string> <string name="text1">operant1</string> <string name="text2">operant</string> <string name="text3">operant2</string> </resources> 結果圖

Android 编程基础

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