- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我的 apk 给了我两个错误,低于今天早上的 26 个,但我似乎不明白解决方案。第一个问题是否有一个好的方法/技巧来跟踪左括号和右括号以及左括号和右括号?第二个问题我的代码有根本性的错误吗?第一个错误发生在 private Button btnExecute 处;我想我在某个地方缺少一个封闭的括号,但不知道在哪里。昨晚当这工作时,我在那条线附近没有一个封闭的括号第二个错误是闭括号距 onClick 末尾两行。我感觉它缺少分号、括号或括号。目标是读取微调器中显示的值并使用 if 语句来确定要运行哪个例程。在每个例程中,我将检查某些 EditText 是否为空或空白,如果不为空,则检查基于微调器条目的特定公式。
package com.androidbook.triviaquiz8;
import android.app.AlertDialog;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
public class QuizHelpActivity extends QuizActivity {
private EditText m1_sqs1;
private EditText m1_rs1;
private EditText m1_rs2;
private EditText m1_cd;
private EditText m1_els1;
private EditText m1_els2;
private EditText m1_sqs1_eng;
private EditText m1_rs1_eng;
private EditText m1_rs2_eng;
private EditText m1_cd_eng;
private EditText m1_els1_eng;
private EditText m1_els2_eng;
private EditText m1_sqs1_met;
private EditText m1_rs1_met;
private EditText m1_rs2_met;
private EditText m1_cd_met;
private EditText m1_els1_met;
private EditText m1_els2_met;
private EditText m1_sa_in;
private EditText m1_sa_ft;
private EditText m1_sa_mm;
private EditText m1_sa_m;
private EditText m1_ed_in;
private EditText m1_ed_ft;
private EditText m1_ed_mm;
private EditText m1_ed_m;
private Spinner m1_ss_spinner;
private Spinner m1_sqs1_spinner;
private Spinner m1_rs1_spinner;
private Spinner m1_rs2_spinner;
private Spinner m1_cd_spinner;
private Spinner m1_els1_spinner;
private Spinner m1_els2_spinner;
private QuizHelpActivity mContext;
private Button btnSave;
private Button btnClear;
private Button btnExecute;
//
// onCreate - let the fun begin!
//
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
mContext = this;
setContentView(R.layout.help);
m1_sqs1 = (EditText) findViewById(R.id.m1_sqs1);
m1_rs1 = (EditText) findViewById(R.id.m1_rs1);
m1_rs2 = (EditText) findViewById(R.id.m1_rs2);
m1_cd = (EditText) findViewById(R.id.m1_cd);
m1_els1 = (EditText) findViewById(R.id.m1_els1);
m1_els2 = (EditText) findViewById(R.id.m1_els2);
m1_sqs1_eng = (EditText) findViewById(R.id.m1_sqs1);
m1_rs1_eng = (EditText) findViewById(R.id.m1_rs1);
m1_rs2_eng = (EditText) findViewById(R.id.m1_rs2);
m1_cd_eng = (EditText) findViewById(R.id.m1_cd);
m1_els1_eng = (EditText) findViewById(R.id.m1_els1);
m1_els2_eng = (EditText) findViewById(R.id.m1_els2);
m1_sqs1_met = (EditText) findViewById(R.id.m1_sqs1);
m1_rs1_met = (EditText) findViewById(R.id.m1_rs1);
m1_rs2_met = (EditText) findViewById(R.id.m1_rs2);
m1_cd_met = (EditText) findViewById(R.id.m1_cd);
m1_els1_met = (EditText) findViewById(R.id.m1_els1);
m1_els2_met = (EditText) findViewById(R.id.m1_els2);
m1_sa_in = (EditText) findViewById(R.id.m1_sa_in);
m1_sa_ft = (EditText) findViewById(R.id.m1_sa_ft);
m1_sa_mm = (EditText) findViewById(R.id.m1_sa_mm);
m1_sa_m = (EditText) findViewById(R.id.m1_sa_m);
m1_ed_in = (EditText) findViewById(R.id.m1_ed_in);
m1_ed_ft = (EditText) findViewById(R.id.m1_ed_ft);
m1_ed_mm = (EditText) findViewById(R.id.m1_ed_mm);
m1_ed_m = (EditText) findViewById(R.id.m1_ed_m);
//
// Create an OnClick Event in each button.
//
Button btnExecute = (Button) findViewById(R.id.btnExecute);
Button btnSave = (Button) findViewById(R.id.btnSave);
Button btnClear = (Button) findViewById(R.id.btnClear);
btnSave.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
}
});
btnClear.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
}
});
btnExecute.setOnClickListener(new View.OnClickListener() {
private AlertDialog show;
public void onClick(View arg0) {
AdapterView<SpinnerAdapter> m1ssspinner;
if (((m1ssspinner.getSelectedItem() == "Square"))) {
if ((m1_sqs1.getText().length() == 0)
|| (m1_sqs1.getText().toString() == " ")) {
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("The Square Side length is empty")
.setPositiveButton("OK", null).show();
} else {
double result = new Double(m1_sqs1.getText().toString()) * new Double(m1_sqs1.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
if (((m1ssspinner.getSelectedItem() == "Rectangle"))) {
if ((m1_rs1.getText().length() == 0)
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().length() == 0)){
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("A Rectangle Side length is empty")
.setPositiveButton("OK", null).show();
} else {
double result = new Double(m1_rs1.getText().toString()) * new Double(m1_rs2.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
if (((m1ssspinner.getSelectedItem() == "Circle"))) {
if ((m1_cd.getText().length() == 0)
|| (m1_cd.getText().toString() == " ")
|| (m1_cd.getText().toString() == " ")){
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("The Circle Diameter is empty")
.setPositiveButton("OK", null).show();
} else {
double result = new Double(m1_cd.getText().toString()) * new Double(m1_cd.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
if (((m1ssspinner.getSelectedItem() == "Elliptical"))) {
if ((m1_els1.getText().length() == 0)
|| (m1_els1.getText().toString() == " ")
|| (m1_els2.getText().toString() == 0)
|| (m1_els2.getText().toString() == " ")){
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("An Elliptical Diameter is empty")
.setPositiveButton("OK", null).show();
} else {
double result = new Double(m1_els1.getText().toString()) * new Double(m1_els2.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
);
//
// End OnClick Event in each button.
//
//
// check media availability
//
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;} else {
// Something else is wrong. It may be one of many other states, but all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
//
// end check media availability
//
//
// create METHOD 1 STACK SHAPE SPINNER (m1_ss_spinner) with displayed text 'centered'
//
Spinner m1ssspinner = (Spinner)findViewById(R.id.m1_ss_spinner);
ArrayAdapter<CharSequence> m1ssadapter = ArrayAdapter.createFromResource(this, R.array.m1_ss_list, R.layout.my_normal_spinner_style);
m1ssadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1ssspinner.setAdapter(m1ssadapter);
//
// get METHOD 1 STACK SHAPE UNIT (m1_ss_unit)
//
Object m1_ss_unit = (m1ssspinner.getSelectedItem());
//
// create METHOD 1 SQUARE_SIDE1 SPINNER (m1_sqs1_spinner) with displayed text 'centered'
//
Spinner m1sqs1spinner = (Spinner)findViewById(R.id.m1_sqs1_spinner);
ArrayAdapter<CharSequence> m1sqs1adapter = ArrayAdapter.createFromResource(this, R.array.m1_sqs1_list, R.layout.my_normal_spinner_style);
m1sqs1adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1sqs1spinner.setAdapter(m1sqs1adapter);
//
// create METHOD 1 RECTANGLE_SIDE1 SPINNER (m1_rs1_spinner) with displayed text 'centered'
//
Spinner m1rs1spinner = (Spinner)findViewById(R.id.m1_rs1_spinner);
ArrayAdapter<CharSequence> m1rs1adapter = ArrayAdapter.createFromResource(this, R.array.m1_rs1_list, R.layout.my_normal_spinner_style);
m1rs1adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1rs1spinner.setAdapter(m1rs1adapter);
//
// create METHOD 1 RECTANGLE_SIDE2 SPINNER (m1_rs2_spinner) with displayed text 'centered'
//
Spinner m1rs2spinner = (Spinner)findViewById(R.id.m1_rs2_spinner);
ArrayAdapter<CharSequence> m1rs2adapter = ArrayAdapter.createFromResource(this, R.array.m1_rs2_list, R.layout.my_normal_spinner_style);
m1rs2adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1rs2spinner.setAdapter(m1rs2adapter);
//
// create METHOD 1 CIRCULAR DIAMETER SPINNER (m1_cd_spinner) with displayed text 'centered'
//
Spinner m1cdspinner = (Spinner)findViewById(R.id.m1_cd_spinner);
ArrayAdapter<CharSequence> m1cdadapter = ArrayAdapter.createFromResource(this, R.array.m1_cd_list, R.layout.my_normal_spinner_style);
m1cdadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1cdspinner.setAdapter(m1cdadapter);
//
// create METHOD 1 ELLIPTICAL DIAMETER1 SPINNER (m1_cd_spinner) with displayed text 'centered'
//
Spinner m1els1spinner = (Spinner)findViewById(R.id.m1_els1_spinner);
ArrayAdapter<CharSequence> m1els1adapter = ArrayAdapter.createFromResource(this, R.array.m1_els1_list, R.layout.my_normal_spinner_style);
m1els1adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1els1spinner.setAdapter(m1els1adapter);
//
// create METHOD 1 ELLIPTICAL DIAMETER2 SPINNER (m1_cd_spinner) with displayed text 'centered'
//
Spinner m1els2spinner = (Spinner)findViewById(R.id.m1_els2_spinner);
ArrayAdapter<CharSequence> m1els2adapter = ArrayAdapter.createFromResource(this, R.array.m1_els2_list, R.layout.my_normal_spinner_style);
m1els2adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m1els2spinner.setAdapter(m1cdadapter);
}
最佳答案
问题太多了,我都不知道从哪里开始。这当然不会编译,因为您的 {} 不平衡,但这并不是您的问题中最不重要的
例如,您的第一个 if/then 包括所有其他条件,并阻止其他任何条件解析为 true
if (((m1ssspinner.getSelectedItem() == "Square")))
封装所有其他测试,例如下一个测试
if (((m1ssspinner.getSelectedItem() == "Rectangle")))
如果第一个为真,第二个就永远不会。
您还有具有相同名称的不同类型的本地变量和类作用域变量,并且本地变量未初始化(或类型正确)
AdapterView<SpinnerAdapter> m1ssspinner; // Probably not what you want to use ...
Spinner m1ssspinner = (Spinner) ...
然后你就有了重复测试的 block
if ((m1_rs1.getText().length() == 0) // Same test twice!
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().length() == 0))
或者你在做同样的事情,但也根据 int 测试字符串
if (((m1ssspinner.getSelectedItem() == "Elliptical"))) {
if ((m1_els1.getText().length() == 0)
|| (m1_els1.getText().toString() == " ")
|| (m1_els2.getText().toString() == 0) // you probably meant int!
|| (m1_els2.getText().toString() == " ")){
此外,您的测试将从微调器返回的对象与字符串文字进行比较(它们不会匹配)
您正在类的顶层初始化 View 类,而不是在 setcontent View 之后的 oncreate 中初始化 View 类等。
无论如何,这个 block 至少可以编译,但是这个程序根本无法按照编写的方式工作,您仍然有很多事情需要解决。
我的建议是一次迈出一步,如果您发现自己陷入了“if/then”的困境,您可能需要重新考虑解决方案
btnExecute.setOnClickListener(new View.OnClickListener()
{
private AlertDialog show;
public void onClick(View arg0)
{
//AdapterView<SpinnerAdapter> m1ssspinner; // Probably you meant to use the class scoped of same name
if (((m1ssspinner.getSelectedItem() == "Square"))) {
if ((m1_sqs1.getText().length() == 0)
|| (m1_sqs1.getText().toString() == " ")) {
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("The Square Side length is empty")
.setPositiveButton("OK", null).show();
} else
{
double result = new Double(m1_sqs1.getText().toString()) * new Double(m1_sqs1.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
} else
if (((m1ssspinner.getSelectedItem() == "Rectangle"))) {
if ((m1_rs1.getText().length() == 0)
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().toString() == " ")
|| (m1_rs1.getText().length() == 0)) {
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("A Rectangle Side length is empty")
.setPositiveButton("OK", null).show();
} else
{
double result = new Double(m1_rs1.getText().toString()) * new Double(m1_rs2.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
} else
if (((m1ssspinner.getSelectedItem() == "Circle"))) {
if ((m1_cd.getText().length() == 0)
|| (m1_cd.getText().toString() == " ")
|| (m1_cd.getText().toString() == " "))
{
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("The Circle Diameter is empty")
.setPositiveButton("OK", null).show();
} else
{
double result = new Double(m1_cd.getText().toString()) * new Double(m1_cd.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
} else
if ((m1ssspinner.getSelectedItem() == "Elliptical")) {
if ((m1_els1.getText().length() == 0)
|| (m1_els1.getText().toString() == " ")
|| (m1_els2.getText().length() == 0)
|| (m1_els2.getText().toString() == " "))
{
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("An Elliptical Diameter is empty")
.setPositiveButton("OK", null).show();
} else {
double result = new Double(m1_els1.getText().toString()) * new Double(m1_els2.getText().toString());
m1_sa_in.setText(Double.toString(result));
}
}
}
}
);
关于java - android java if语句中的语法错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6750859/
我已经使用 vue-cli 两个星期了,直到今天一切正常。我在本地建立这个项目。 https://drive.google.com/open?id=0BwGw1zyyKjW7S3RYWXRaX24tQ
您好,我正在尝试使用 python 库 pytesseract 从图像中提取文本。请找到代码: from PIL import Image from pytesseract import image_
我的错误 /usr/bin/ld: errno: TLS definition in /lib/libc.so.6 section .tbss mismatches non-TLS reference
我已经训练了一个模型,我正在尝试使用 predict函数但它返回以下错误。 Error in contrasts<-(*tmp*, value = contr.funs[1 + isOF[nn]])
根据Microsoft DataConnectors的信息我想通过 this ODBC driver 创建一个从 PowerBi 到 PostgreSQL 的连接器使用直接查询。我重用了 Micros
我已经为 SoundManagement 创建了一个包,其中有一个扩展 MediaPlayer 的类。我希望全局控制这个变量。这是我的代码: package soundmanagement; impo
我在Heroku上部署了一个应用程序。我正在使用免费服务。 我经常收到以下错误消息。 PG::Error: ERROR: out of memory 如果刷新浏览器,就可以了。但是随后,它又随机发生
我正在运行 LAMP 服务器,这个 .htaccess 给我一个 500 错误。其作用是过滤关键字并重定向到相应的域名。 Options +FollowSymLinks RewriteEngine
我有两个驱动器 A 和 B。使用 python 脚本,我在“A”驱动器中创建一些文件,并运行 powerscript,该脚本以 1 秒的间隔将驱动器 A 中的所有文件复制到驱动器 B。 我在 powe
下面的函数一直返回这个错误信息。我认为可能是 double_precision 字段类型导致了这种情况,我尝试使用 CAST,但要么不是这样,要么我没有做对...帮助? 这是错误: ERROR: i
这个问题已经有答案了: Syntax error due to using a reserved word as a table or column name in MySQL (1 个回答) 已关闭
我的数据库有这个小问题。 我创建了一个表“articoli”,其中包含商品的品牌、型号和价格。 每篇文章都由一个 id (ID_ARTICOLO)` 定义,它是一个自动递增字段。 好吧,现在当我尝试插
我是新来的。我目前正在 DeVry 在线学习中级 C++ 编程。我们正在使用 C++ Primer Plus 这本书,到目前为止我一直做得很好。我的老师最近向我们扔了一个曲线球。我目前的任务是这样的:
这个问题在这里已经有了答案: What is an undefined reference/unresolved external symbol error and how do I fix it?
我的网站中有一段代码有问题;此错误仅发生在 Internet Explorer 7 中。 我没有在这里发布我所有的 HTML/CSS 标记,而是发布了网站的一个版本 here . 如您所见,我在列中有
如果尝试在 USB 设备上构建 node.js 应用程序时在我的树莓派上使用 npm 时遇到一些问题。 package.json 看起来像这样: { "name" : "node-todo",
在 Python 中,您有 None单例,在某些情况下表现得很奇怪: >>> a = None >>> type(a) >>> isinstance(a,None) Traceback (most
这是我的 build.gradle (Module:app) 文件: apply plugin: 'com.android.application' android { compileSdkV
我是 android 的新手,我的项目刚才编译和运行正常,但在我尝试实现抽屉导航后,它给了我这个错误 FAILURE: Build failed with an exception. What wen
谁能解释一下?我想我正在做一些非常愚蠢的事情,并且急切地等待着启蒙。 我得到这个输出: phpversion() == 7.2.25-1+0~20191128.32+debian8~1.gbp108
我是一名优秀的程序员,十分优秀!