设计一个简单的计算器。
第一个Activity的界面。
第二个Activity显示算式和计算结果。
第一个Activity代码:
import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { Button one,two,three,four,five,six,seven,eight,nine,zero,div,mod,mul,fenshu,sub,equal,point,add; double num1,num2,num,xiaoshudian; int flag,ispoint; char operation[]=new char[2]; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); num1=0;num2=0;num=0;flag=0;ispoint=0;xiaoshudian=0.1; one=(Button)findViewById(R.id.one); two=(Button)findViewById(R.id.two); three=(Button)findViewById(R.id.three); four=(Button)findViewById(R.id.four); five=(Button)findViewById(R.id.five); six=(Button)findViewById(R.id.six); seven=(Button)findViewById(R.id.seven); eight=(Button)findViewById(R.id.eight); nine=(Button)findViewById(R.id.nine); zero=(Button)findViewById(R.id.zero); div=(Button)findViewById(R.id.div); mod=(Button)findViewById(R.id.mod); mul=(Button)findViewById(R.id.mul); fenshu=(Button)findViewById(R.id.fenshu); sub=(Button)findViewById(R.id.sub); add=(Button)findViewById(R.id.add); equal=(Button)findViewById(R.id.equal); point=(Button)findViewById(R.id.point); one.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+1; else {num1=num1+1*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+1; else{num2=num2+1*xiaoshudian;xiaoshudian/=10;} } } }); two.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+2; else {num1=num1+2*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+2; else{num2=num2+2*xiaoshudian;xiaoshudian/=10;} } } }); three.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+3; else {num1=num1+3*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+3; else{num2=num2+3*xiaoshudian;xiaoshudian/=10;} } } }); four.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+4; else {num1=num1+4*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+4; else{num2=num2+4*xiaoshudian;xiaoshudian/=10;} } } }); five.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+5; else {num1=num1+5*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+5; else{num2=num2+5*xiaoshudian;xiaoshudian/=10;} } } }); six.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+6; else {num1=num1+6*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+6; else{num2=num2+6*xiaoshudian;xiaoshudian/=10;} } } }); seven.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+7; else {num1=num1+7*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+7; else{num2=num2+7*xiaoshudian;xiaoshudian/=10;} } } }); eight.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+8; else {num1=num1+8*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+8; else{num2=num2+8*xiaoshudian;xiaoshudian/=10;} } } }); nine.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10+9; else {num1=num1+9*xiaoshudian;xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10+9; else{num2=num2+9*xiaoshudian;xiaoshudian/=10;} } } }); zero.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==0){ if(ispoint==0)num1=num1*10; else {xiaoshudian/=10;} } else{ if(ispoint==0)num2=num2*10; else{xiaoshudian/=10;} } } }); point.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { ispoint=1; } }); add.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { flag=1; ispoint=0; } }); sub.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { flag=2; ispoint=0; } }); mul.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { flag=3; ispoint=0; } }); div.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { flag=4; ispoint=0; } }); equal.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { if(flag==1){num=num1+num2;operation[0]=‘+‘;} else if(flag==2){num=num1-num2;operation[0]=‘-‘;} else if(flag==3){num=num1*num2;operation[0]=‘*‘;} else if(flag==4){num=num1/num2;operation[0]=‘/‘;} Intent intent=new Intent(MainActivity.this,SecondActivity.class); intent.putExtra("num1", new Double(num1).toString()); intent.putExtra("opreation",new String(operation).toString()); intent.putExtra("num2", new Double(num2).toString()); intent.putExtra("num", new Double(num).toString()); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } }
第二个Activity代码:
import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class SecondActivity extends Activity{ EditText text; Button myButton; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second); text=(EditText)findViewById(R.id.edt); myButton=(Button)findViewById(R.id.btn); Intent intent=getIntent(); String num1=intent.getStringExtra("num1"); String operation=intent.getStringExtra("opreation"); String num2=intent.getStringExtra("num2"); String num=intent.getStringExtra("num"); text.setText(num1+operation+num2+"="+num); myButton.setOnClickListener(new myButtonListener()); } class myButtonListener implements OnClickListener{ public void onClick(View arg0){ Intent intent=new Intent(SecondActivity.this,MainActivity.class); startActivity(intent); } } }
第一个Activity布局:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/seven" android:layout_width="40px" android:layout_height="wrap_content" android:text="7" /> <Button android:id="@+id/eight" android:layout_toRightOf="@id/seven" android:layout_width="40px" android:layout_height="wrap_content" android:text="8" /> <Button android:id="@+id/nine" android:layout_toRightOf="@id/eight" android:layout_width="40px" android:layout_height="wrap_content" android:text="9" /> <Button android:id="@+id/div" android:layout_toRightOf="@id/nine" android:layout_width="40px" android:layout_height="wrap_content" android:text="/" /> <Button android:id="@+id/mod" android:layout_toRightOf="@id/div" android:layout_width="40px" android:layout_height="wrap_content" android:text="%" /> <Button android:id="@+id/four" android:layout_below="@id/seven" android:layout_width="40px" android:layout_height="wrap_content" android:text="4" /> <Button android:id="@+id/five" android:layout_toRightOf="@id/four" android:layout_below="@id/eight" android:layout_width="40px" android:layout_height="wrap_content" android:text="5" /> <Button android:id="@+id/six" android:layout_toRightOf="@id/five" android:layout_below="@id/nine" android:layout_width="40px" android:layout_height="wrap_content" android:text="6" /> <Button android:id="@+id/mul" android:layout_toRightOf="@id/six" android:layout_below="@id/div" android:layout_width="40px" android:layout_height="wrap_content" android:text="*" /> <Button android:id="@+id/fenshu" android:layout_toRightOf="@id/mul" android:layout_below="@id/mod" android:layout_width="40px" android:layout_height="wrap_content" android:text="1/x" /> <Button android:id="@+id/one" android:layout_below="@id/four" android:layout_width="40px" android:layout_height="wrap_content" android:text="1" /> <Button android:id="@+id/two" android:layout_toRightOf="@id/one" android:layout_below="@id/five" android:layout_width="40px" android:layout_height="wrap_content" android:text="2" /> <Button android:id="@+id/three" android:layout_toRightOf="@id/two" android:layout_below="@id/six" android:layout_width="40px" android:layout_height="wrap_content" android:text="3" /> <Button android:id="@+id/sub" android:layout_toRightOf="@id/three" android:layout_below="@id/mul" android:layout_width="40px" android:layout_height="wrap_content" android:text="-" /> <Button android:id="@+id/equal" android:layout_toRightOf="@id/sub" android:layout_below="@id/fenshu" android:layout_width="40px" android:layout_height="70px" android:text="=" /> <Button android:id="@+id/zero" android:layout_below="@id/one" android:layout_width="80px" android:layout_height="wrap_content" android:text="0" /> <Button android:id="@+id/point" android:layout_toRightOf="@id/zero" android:layout_below="@id/three" android:layout_width="40px" android:layout_height="wrap_content" android:text="." /> <Button android:id="@+id/add" android:layout_toRightOf="@id/point" android:layout_below="@id/sub" android:layout_width="40px" android:layout_height="wrap_content" android:text="+" /> </RelativeLayout>
第二个Activity布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <EditText android:id="@+id/edt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/one" /> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/edt" android:text="返回" /> </LinearLayout>
android实现计算器功能
时间: 2024-12-18 12:33:39