Android studio 如何从微调器中选择项目,然后单击按钮进行操作?
我有一个带有3个项目的Android studio 如何从微调器中选择项目,然后单击按钮进行操作?,android-studio,android-spinner,buttonclick,Android Studio,Android Spinner,Buttonclick,我有一个带有3个项目的微调器,我想为每个选定的项目做不同的事情,比如,如果选定的项目是“添加”,然后通过按钮单击添加2个数字,我已经实现了一个代码,它可以工作,但不是在按钮单击时如何连接 这是我的密码 button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { spinner.setOnItem
微调器,我想为每个选定的项目做不同的事情,比如,如果选定的项目是“添加”,然后通过按钮单击添加2个数字,我已经实现了一个代码,它可以工作,但不是在按钮单击时如何连接
这是我的密码
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String uints = parent.getItemAtPosition(position).toString();
switch (position) {
case 0:
double r1 = Double.parseDouble(input1.getText().toString());
double r2 = Double.parseDouble(input2.getText().toString());
double rout = r1 + r2;
textView.setText(Double.toString(rout));
break;
case 1:
double r12 = Double.parseDouble(input1.getText().toString());
double r22 = Double.parseDouble(input2.getText().toString());
double rout2 = r12 - r22;
textView.setText(Double.toString(rout2));
break;
case 2:
double r13 = Double.parseDouble(input1.getText().toString());
double r23 = Double.parseDouble(input2.getText().toString());
double rout3 = r13 / r23;
textView.setText(Double.toString(rout3));
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
button.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
spinner.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
字符串uints=parent.getItemAtPosition(position.toString();
开关(位置){
案例0:
double r1=double.parseDouble(input1.getText().toString());
double r2=double.parseDouble(input2.getText().toString());
双路由=r1+r2;
setText(Double.toString(rout));
打破
案例1:
double r12=double.parseDouble(input1.getText().toString());
double r22=double.parseDouble(input2.getText().toString());
双路2=r12-r22;
setText(Double.toString(rout2));
打破
案例2:
double r13=double.parseDouble(input1.getText().toString());
double r23=double.parseDouble(input2.getText().toString());
双路3=r13/r23;
setText(Double.toString(rout3));
打破
}
}
@凌驾
未选择公共无效(AdapterView父级){
}
谢谢您的帮助。不要在按钮内编写微调器。setOnItemSelectedListener
。setOnClickListener
首先添加微调器。setOnItemSelectedListener
并将值存储在任何整数中
现在比较按钮处的integer
值。设置ClickListener
并执行该操作
这是密码-
int selectedPosition = 0;
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected (AdapterView < ? > parent, View view,int position, long id){
selectedPosition = position;
}
@Override
public void onNothingSelected (AdapterView < ? > parent){
}
});
button.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick (View v){
switch (selectedPosition) {
case 0:
double r1 = Double.parseDouble(input1.getText().toString());
double r2 = Double.parseDouble(input2.getText().toString());
double rout = r1 + r2;
textView.setText(Double.toString(rout));
break;
case 1:
double r12 = Double.parseDouble(input1.getText().toString());
double r22 = Double.parseDouble(input2.getText().toString());
double rout2 = r12 - r22;
textView.setText(Double.toString(rout2));
break;
case 2:
double r13 = Double.parseDouble(input1.getText().toString());
double r23 = Double.parseDouble(input2.getText().toString());
double rout3 = r13 / r23;
textView.setText(Double.toString(rout3));
break;
}
}
});
int-selectedPosition=0;
spinner.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener()
{
@凌驾
已选择公共位置(AdapterView<?>父级、视图、整型位置、长id){
selectedPosition=位置;
}
@凌驾
未选择公共无效(AdapterView<?>父级){
}
});
setOnClickListener(新视图.OnClickListener()
{
@凌驾
公共void onClick(视图v){
开关(选定位置){
案例0:
double r1=double.parseDouble(input1.getText().toString());
double r2=double.parseDouble(input2.getText().toString());
双路由=r1+r2;
setText(Double.toString(rout));
打破
案例1:
double r12=double.parseDouble(input1.getText().toString());
double r22=double.parseDouble(input2.getText().toString());
双路2=r12-r22;
setText(Double.toString(rout2));
打破
案例2:
double r13=double.parseDouble(input1.getText().toString());
double r23=double.parseDouble(input2.getText().toString());
双路3=r13/r23;
setText(Double.toString(rout3));
打破
}
}
});
据我所知,您希望在单击按钮时显示选定的微调器项目,以便您可以通过微调器直接获取选定项目,而无需任何侦听器
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch(spinner.getSelectedItemPosition()){
//Do whatever you want
}
}
}
您可以使用默认函数获取所选项目的ID、视图、位置或项目本身
spinner.getSelectedItemId()
spinner.getSelectedItemView()
spinner.getSelectedItemPosition()
spinner.getSelectedItem()
我试过这样做,因为我知道应用程序在启动时崩溃。但不确定我放在按钮上的比较是什么意思。setClick textView.setText(Double.toString(value));哪个值是我存储在交换机中的Doublecase@Ajed据我所知,我已经更新了代码。