安卓Activity:
package com.example.count_number;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private int x,y;//用以产生x,y
private int fhao;//用以产生符号
private EditText t1,t2,t3;
private Button b1;
private int answer,sure;
private EditText e1,e2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
x = (int)(Math.random() *9)+1; //不能出现0
y = (int)(Math.random() *9)+1;
fhao= (int)(Math.random() *4)+1;
t1=(EditText)findViewById(R.id.et1);
t2=(EditText)findViewById(R.id.et2);
t3=(EditText)findViewById(R.id.et3);
b1=(Button)findViewById(R.id.button1);
e1=(EditText)findViewById(R.id.editText1);
e2=(EditText)findViewById(R.id.editText2);
//显示
t1.setText(x);
switch(fhao)
{
case 1:
t2.setText("+");
sure=x+y;
break;
case 2:
t2.setText("-");
sure=x-y;
break;
case 3:
t2.setText("*");
sure=x*y;
break;
case 4:
t2.setText("/");
sure=x/y;
break;
}
t3.setText(y);
//输入和确定答案
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
answer=Integer.parseInt(e1.getText().toString());
if(answer==sure)
{
e2.setText("正确");
}
if(answer!=sure)
{
e2.setText("错误");
}
}
});
}
}
安卓XML 文件
<RelativeLayout xmlns:andro />
</RelativeLayout>
这是一个简单的小学生四则运算APP