博观而约取，厚积而薄发。这篇文章主要讲述小学四则运算口算练习app---No.4相关的知识，希望能为你提供帮助。
今天主要是改了出题页中各个组件的位置以及时间的接收还有时间控制，代码如下：（但是存在一个问题   设置页面点击确定按钮进入出题界面时有时会闪退，未解决！）

CalculatorActivity.class

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("÷") & & (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();
}
}

Intent intent = new Intent();

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();

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
}
}
});
}
}

结果如下：

【小学四则运算口算练习app---No.4】
文章图片

 

布局页面：activity_calculator

< ?xml version="1.0" encoding="utf-8"?>
< ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:background="@mipmap/qq"
android:layout_width="match_parent"
android:layout_height="match_parent">
tools:context=".resultActivity" >



< !--TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="题目"/-->
< LinearLayout
android:id="@+id/viewObj"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:textSize="25sp"
android:textColor="#7300ff"
android:layout_x="1px"
android:layout_y="1px" />

< /ScrollView>


这次加了弹出框的设置，主要有两种样式Toast和Alert.使用方法详见文章：http://blog.csdn.net/dearmali/article/details/49885759

Android提供常用的消息弹出框，Toast和Alert。

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