Android-注册按钮单击并根据选择的电台采取行动
我试图教自己如何编写android应用程序,但我很难注册按钮点击并根据当时选择的单选按钮采取行动。这是一个简单的提示计算器:Android-注册按钮单击并根据选择的电台采取行动,android,button,radio-button,Android,Button,Radio Button,我试图教自己如何编写android应用程序,但我很难注册按钮点击并根据当时选择的单选按钮采取行动。这是一个简单的提示计算器: import android.app.Activity; import android.os.Bundle; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; import android.widget.TextView; imp
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.RadioGroup;
import android.view.View;
public class TipCalc extends Activity implements RadioGroup.OnCheckedChangeListener,View.OnClickListener
{
TextView result;
RadioGroup radiogroup1;
RadioButton r1,r2,r3;
Button calculate;
EditText bill, resulttotal;
private int radioCheckedId = -1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
radiogroup1 = (RadioGroup) findViewById(R.id.radiogroup1);
Button calculate = (Button) findViewById(R.id.calculate);
RadioButton r1 = (RadioButton) findViewById(R.id.poor);
RadioButton r2 = (RadioButton) findViewById(R.id.average);
RadioButton r3 = (RadioButton) findViewById(R.id.excellent);
EditText bill = new EditText(this);
EditText resulttotal = new EditText(this);
radiogroup1.setOnCheckedChangeListener(this);
calculate.setOnClickListener(this);
//bill.setText("0");
//resulttotal.setText("0");
}
public void onCheckedChanged(RadioGroup group, int checkedId) {
radioCheckedId = checkedId;
}
public void onClick(View v)
{
if (v == calculate)
{
String billtotal;
double total = 0;
billtotal = bill.getText().toString();
final int aInt = Integer.parseInt(billtotal);
if (radioCheckedId == 1)
{
total = aInt * 1.1;
final String aString = Double.toString(total);
resulttotal.setText(aString);
}
if (radioCheckedId == 2)
{
total = aInt * 1.15;
final String aString = Double.toString(total);
resulttotal.setText(aString);
}
if (radioCheckedId == 3)
{
total = aInt * 1.2;
final String aString = Double.toString(total);
resulttotal.setText(aString);
}
}
}
}
所有内容都可以正常加载,但当我在虚拟手机中按下“计算”按钮时,什么都不会发生。您的问题是,您从未将EditText实例添加到当前布局中
您应该将它们作为主布局的子级添加。问题在于您在哪里比较所选id。。。您需要将onClick()更改为: 给你的将是视图的R.id,而不仅仅是一个数字,告诉你它是在序列中 一些快速(不相关)的建议:
- 使用switch语句而不是一堆if语句
- 在那里放一些东西来检查-1(未检查)也。。。只是想确定一下
- 在onClick()中,我通常通过检查传入视图的id来检查单击了哪个视图。这只会使您不必保存所有内容,并且(IMHO)更清楚地了解您在谈论什么
public void onClick(View v) {
if (v.getId() == R.id.calculate) {
String billtotal;
double total = 0;
billtotal = bill.getText().toString();
final int aInt = Integer.parseInt(billtotal);
switch(radioCheckedId) {
case R.id.poor:
total = aInt * 1.1;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
case R.id.average:
total = aInt * 1.15;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
case R.id.excellent:
total = aInt * 1.2;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
default:
// do something for when nothing is selected... maybe throw an error?
break;
}
}
}
public void onClick(View v) {
int radioCheckedId = radiogroup1.getCheckedRadioButtonId();
if (v == calculate) {
// ...
最后,如果您在onCheckedChanged()中所做的全部工作都是存储值,那么您可以将其全部删除,然后在onClick()中检查它。比如:
public void onClick(View v) {
if (v.getId() == R.id.calculate) {
String billtotal;
double total = 0;
billtotal = bill.getText().toString();
final int aInt = Integer.parseInt(billtotal);
switch(radioCheckedId) {
case R.id.poor:
total = aInt * 1.1;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
case R.id.average:
total = aInt * 1.15;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
case R.id.excellent:
total = aInt * 1.2;
final String aString = Double.toString(total);
resulttotal.setText(aString);
break;
default:
// do something for when nothing is selected... maybe throw an error?
break;
}
}
}
public void onClick(View v) {
int radioCheckedId = radiogroup1.getCheckedRadioButtonId();
if (v == calculate) {
// ...
不相关,但我注意到另一个问题(还有其他人提到)。。。如果XML布局中列出了您的钩子,那么您需要像这样获得钩子(而不是创建新的钩子):
此外,如果您不需要编辑结果,您可能只需要使用一个而不是一个EditView来编辑结果。我也有一些类似的问题。我在一个广播小组活动中有一个倒计时。
import java.text.NumberFormat;
import java.util.Locale;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.RadioGroup;
import android.view.View;
public class TipCalc extends Activity
{
TextView result;
RadioGroup radiogroup1;
RadioButton r1,r2,r3;
Button calculate;
EditText bill, resulttotal;
Locale currentLocale = Locale.getDefault();
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
radiogroup1 = (RadioGroup) findViewById(R.id.radiogroup1);
final Button calculate = (Button) findViewById(R.id.calculate);
final RadioButton r1 = (RadioButton) findViewById(R.id.poor);
final RadioButton r2 = (RadioButton) findViewById(R.id.average);
final RadioButton r3 = (RadioButton) findViewById(R.id.excellent);
final EditText bill = (EditText) findViewById(R.id.bill);
final EditText tiptotal = (EditText) findViewById(R.id.tiptotal);
final EditText resulttotal = (EditText) findViewById(R.id.resulttotal);
bill.setText("0.00");
tiptotal.setText("0.00");
resulttotal.setText("0.00");
calculate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) throws NumberFormatException {
if (v == calculate)
{
NumberFormat currencyFormatter;
currencyFormatter = NumberFormat.getCurrencyInstance(currentLocale);
double atotal = 0;
double btotal = 0;
String billtotal = bill.getText().toString();
Double aDbl = 0.00;
try
{
aDbl = Double.parseDouble(billtotal);
}
catch(NumberFormatException n)
{
aDbl = 0.00;
}
if (r1.isChecked())
{
atotal = aDbl * 1.1;
btotal = aDbl * 0.1;
}
if (r2.isChecked())
{
atotal = aDbl * 1.15;
btotal = aDbl * 0.15;
}
if (r3.isChecked())
{
atotal = aDbl * 1.2;
btotal = aDbl * 0.2;
}
final String bString = currencyFormatter.format(btotal);
tiptotal.setText(bString);
final String aString = currencyFormatter.format(atotal);
resulttotal.setText(aString);
}
}
});
}
}
当用户单击“下一步”按钮时,将检查单选组以查看是否选择了某个选项。
我实现了倒计时结束时按下的按钮,现在我需要传递一个选中的无线电Id,以绕过未选中选项的默认用户消息
案例R.id.next:
Log.d(" ID BOTAO",((java.lang.String) String).valueOf(rGroup3.getCheckedRadioButtonId()));
if(rGroup3.getCheckedRadioButtonId()==-1){
Context context = getApplicationContext();
CharSequence text = "Please, select an option!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
break;
}
你是说换成这个?EditText bill=(EditText)findViewById(R.id.bill);EditText resulttotal=(EditText)findViewById(R.id.resulttotal);这是一个问题,但不是问题所在。将它们添加到当前布局而不是作为孩子添加会造成什么损害?决定不使用switch语句,因为只有3个选项,而且似乎没有必要,尽管这样会更干净。我在xml文档中选中了一个单选按钮,因此确实没有办法不选中一个,但我认为安全总比抱歉好。我找到的解决方案(贴在下面)与我如何处理onclicklistener有关。是的,切换是一种个人偏好。看起来你的解决方案也应该有效。