小学四则运算口算练习app---No.7 _练习

采得百花成蜜后，为谁辛苦为谁甜。这篇文章主要讲述小学四则运算口算练习app---No.7相关的知识，希望能为你提供帮助。
【小学四则运算口算练习app---No.7】今天主要改了设置页面的提示框以及按钮的闪退问题：

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activity_calculators .class

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.AlertDialog;
import android.content.Intent;
import android.widget.TextView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.content.DialogInterface;
import android.widget.Toast;

public class activity_calculators extends AppCompatActivity {
private Button begin;
EditText b,min,sec;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculators);
begin=(Button)findViewById(R.id.button1);

b=(EditText)findViewById(R.id.editText2);
min=(EditText)findViewById(R.id.editText3);
sec=(EditText)findViewById(R.id.editText4);
begin.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent=new Intent();
String tishu=b.getText().toString(); //获取输入的数值
String minute=min.getText().toString(); //获取输入的数值
String second=sec.getText().toString(); //获取输入的数值
Bundle bundle = new Bundle();
bundle.putString("tishu", tishu);
bundle.putString("minute", minute);
bundle.putString("second", second);
intent.putExtras(bundle); //将题目数量传入下一个页面这是一个方法
if (second.length() == 0 || minute.length() == 0 ) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(activity_calculators.this)
.setMessage("设置有误，请完善！")
.setPositiveButton("确认", new DialogInterface.OnClickListener() {//弹出窗口

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
builder1.create().show();
}
if (second.length() != 0 & & minute.length() != 0 ) {
intent.setClass(activity_calculators.this, CalculatorActivity.class); //跳转
startActivity(intent);
//activity_calculators.this.finish();
}
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
menu.add(Menu.NONE, Menu.FIRST + 2, 2, "保存").setIcon(android.R.drawable.ic_menu_edit);
menu.add(Menu.NONE, Menu.FIRST + 3, 6, "帮助").setIcon(android.R.drawable.ic_menu_help);
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case Menu.FIRST + 2:
Toast.makeText(this, "保存菜单被点击了", Toast.LENGTH_LONG).show();
break;
case Menu.FIRST + 3:
Toast.makeText(this, "帮助菜单被点击了", Toast.LENGTH_LONG).show();

break;
}
return false;
}
}

按钮的闪退（偶尔）问题：

本来以为是因为如下所说的原因，但改完之后仍报错，继续在其他页面找问题，最后发现是出题页的class没有判断出题是除法时分母不为0的问题，

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在这里加一个判断分母是0 即可，而且这个位置要加在第一个位置上面！首先就要判断他是不是0.
Calculator.class(最终版)

import android.os.Build;
import android.os.Bundle;
import java.util.Random;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.AlertDialog;
import android.app.Activity;
import android.content.Intent;
import android.support.annotation.RequiresApi;
import android.text.InputType;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.DialogInterface;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.Chronometer.OnChronometerTickListener;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
;
public class CalculatorActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);

LinearLayout linearLayout = (LinearLayout)findViewById(R.id.viewObj);
RelativeLayout relativeLayout = new RelativeLayout(this);

Intent inten = getIntent();
Bundle bundle = inten.getExtras();
String tishu = bundle.getString("tishu"); //接收传过来的题目的数量

String min = bundle.getString("minute");
String sec = bundle.getString("second"); //接收时间

int i1 = 0, minute = 0, second = 0;
try {
i1 = Integer.parseInt(tishu); //i1在这里是题目数量的整形值
minute = Integer.parseInt(min);
second = Integer.parseInt(sec);
} catch (NumberFormatException e) {
e.printStackTrace();
}

final EditText[] input = new EditText[i1];
TextView[] showti = new TextView[i1];
final int[] shu1 = new int[i1];
final int[] shu2 = new int[i1];
final int[] result = new int[i1];
final String[] user = new String[i1];
final String[] show = new String[i1];
LinearLayout ll = (LinearLayout) findViewById(R.id.viewObj);

Random r = new Random();
char[] ch = {\'+\', \'-\', \'×\', \'÷\'}; //字符数组

final Chronometer ch1 = new Chronometer(this);
ch1.setBase(SystemClock.elapsedRealtime());
ch1.setFormat("已用时间：%s");
ch1.start();
ll.addView(ch1);
for (int i = 0; i < i1; i++) {
int index = r.nextInt(ch.length); //随机数，小于数组的长度数, 0~3
char flag = ch[index]; //获取运算符号
String d = String.valueOf(flag); //运算符
show[i] = "";
int a = (int) (Math.random() * 100);
int b = (int) (Math.random() * 100);

shu1[i] = a;
shu2[i] = b;

while ((d.equals("+") & & (a + b > 100)) || (d.equals("-") & & (a - b < = 0)) || (d.equals("×") & & (a > 9 || a < 1 || b > 9 || b < 1)) || (d.equals("÷") & & (b==0||a / b > 9 || a % b != 0 || a > 81 || b > 9 || a < b))) {
a = (int) (Math.random() * 100);
b = (int) (Math.random() * 100);
}

if (d.equals("+"))
result[i] = a + b;
else if (d.equals("-"))
result[i] = a - b;
else if (d.equals("×"))
result[i] = a * b;
else
result[i] = a / b;
String sa = Integer.toString(a);
String sb = Integer.toString(b);
showti[i] = new TextView(this);
show[i] += "\\n" + sa + d + sb + "=";
showti[i].setTextSize(20);
showti[i].setText(show[i]);
showti[i].setId(View.generateViewId());
input[i] = new EditText(this);
input[i].setTextSize(25);
input[i].setInputType(InputType.TYPE_CLASS_NUMBER);
input[i].setId(View.generateViewId());
input[i].setEms(6);
RelativeLayout.LayoutParams layoutParams =
new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
if(i == 0)
{
layoutParams.setMargins(250,0,0,0);
showti[i].setLayoutParams(layoutParams);
relativeLayout.addView(showti[i]);
}
else {
layoutParams.addRule(RelativeLayout.BELOW,showti[i-1].getId());
layoutParams.setMargins(250,0,0,0);
showti[i].setLayoutParams(layoutParams);
relativeLayout.addView(showti[i]);
}

layoutParams =
new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.addRule(RelativeLayout.RIGHT_OF,showti[i].getId());
if(i != 0)layoutParams.addRule(RelativeLayout.BELOW,showti[i-1].getId());
input[i].setLayoutParams(layoutParams);
relativeLayout.addView(input[i]);
}
linearLayout.addView(relativeLayout);
final Button finish = new Button(this);
finish.setText("完成");
LinearLayout.LayoutParams layoutParams =
new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
finish.setLayoutParams(layoutParams);
linearLayout.addView(finish);

final int timeover = minute * 60 + second;

ch1.setOnChronometerTickListener(new OnChronometerTickListener() {
@Override
public void onChronometerTick(Chronometer arg0) {
// TODO Auto-generated method stub
if(SystemClock.elapsedRealtime()-ch1.getBase()> =timeover*1000){
AlertDialog.Builder builder1 = new AlertDialog.Builder(CalculatorActivity.this)
.setMessage("时间到！")
.setPositiveButton("确认", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {

for (int i = 0; i < shu1.length; i++) {
if (TextUtils.isEmpty(input[i].getText())) {
user[i] = "未作答";
} else {
user[i] = input[i].getText().toString();
}
}
String time = ch1.getText().toString();
Intent intent = new Intent();
Bundle bundle = new Bundle();
bundle.putIntArray("shu1", shu1); //产生的数字
bundle.putIntArray("shu2", shu2); //产生的数字
bundle.putStringArray("user", user); //算的结果
bundle.putStringArray("show", show); //产生的算式
bundle.putIntArray("result", result); //正确的结果
bundle.putString("time", time); //使用的时间
intent.putExtras(bundle);
intent.setClass(CalculatorActivity.this, resultActivity.class); //跳转
startActivity(intent);
//CalculatorActivity.this.finish();
dialog.dismiss();
}
});

builder1.create().show();

finish.callOnClick();
}

}
});

finish.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {//触及按钮事件完成页面跳转进入答案页面
// TODO Auto-generated method stub

for (int i = 0; i < user.length; i++) {
if (TextUtils.isEmpty(input[i].getText())) {
user[i] = "未作答";
} else {
user[i] = input[i].getText().toString();
}
}
ch1.stop();
String time = ch1.getText().toString();
Intent intent = new Intent();
Bundle bundle = new Bundle();
bundle.putIntArray("shu1", shu1); //产生的数字
bundle.putIntArray("shu2", shu2); //产生的数字
bundle.putStringArray("user", user); //算的结果
bundle.putStringArray("show", show); //产生的算式
bundle.putIntArray("result", result); //正确的结果
bundle.putString("time", time); //使用的时间
intent.putExtras(bundle);
if(SystemClock.elapsedRealtime()-ch1.getBase()< timeover*1000){
intent.setClass(CalculatorActivity.this, resultActivity.class); //跳转
startActivity(intent);
//CalculatorActivity.this.finish(); //注释了这句话按手机上的返回键可以返回上一层
}
}
});
}
}