import java.util.Random;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class CalculatorActivity extends Activity {

	private final Random num1=new Random();

	private final Random num2=new Random();

	private final Random r = new Random();

	private char[] ch = {'+','-','*','/'}; //字符数组

	private int index = r.nextInt(ch.length); //随机数，小于数组的长度数, 0~3

	private char a=ch[index];

	private TextView text1,text2,text3;

	private EditText answer;

	private Button surebutton;//确定按钮

	private String c;

	private String e;

	private String b;

	private int i1,i2,i3;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_calculator);

		text1=(TextView)findViewById(R.id.textView1);//随机数字

		text2=(TextView)findViewById(R.id.textView2);//运算符号

		text3=(TextView)findViewById(R.id.textView3);//随机数字

		answer=(EditText)findViewById(R.id.editText1);//运算结果

		b=answer.getText().toString();//获取输入的数值

		i1=Integer.valueOf(b);

		c=String.valueOf(num1.nextInt(100));

		i1=Integer.valueOf(c);

		String d=String.valueOf(a);

		e=String.valueOf(num2.nextInt(100));

		i3=Integer.valueOf(e);

		text1.setText(c);//随机数1-100

		text2.setText(d);//随机运算符+,-,*,/

		text3.setText(e);//随机数1-100

		surebutton=(Button)findViewById(R.id.surebutton);//确定按钮

		surebutton.setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View arg0) {

				// TODO Auto-generated method stub

				switch(index){

				case 0:

				{

					if(i1==i2+i3)

						Toast.makeText(CalculatorActivity.this, "正确"+b, Toast.LENGTH_SHORT).show();

					else

						Toast.makeText(CalculatorActivity.this, "错误"+b, Toast.LENGTH_SHORT).show();

					break;

				}

				case 1:

				{

					if(i1==i2-i3)

						Toast.makeText(CalculatorActivity.this, "正确"+b, Toast.LENGTH_SHORT).show();

					else

						Toast.makeText(CalculatorActivity.this, "错误"+b, Toast.LENGTH_SHORT).show();

					break;

				}

				case 2:{

					if(i1==i2*i3)

						Toast.makeText(CalculatorActivity.this, "正确"+b, Toast.LENGTH_SHORT).show();

					else

						Toast.makeText(CalculatorActivity.this, "错误"+b, Toast.LENGTH_SHORT).show();

					break;

				}

				case 3:

				{

					if(i3!=0){

					if(i1==(i2/i3))

						Toast.makeText(CalculatorActivity.this, "正确"+b, Toast.LENGTH_SHORT).show();

					else

						Toast.makeText(CalculatorActivity.this, "错误"+b, Toast.LENGTH_SHORT).show();

					}

					break;

				}

				}

			}

		});

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.calculator, menu);

		return true;

	}

}