在我的AlertDialog中，我有一个Spinner和一个EditText。如果
，我试图禁用对话框的肯定按钮在下面的代码中，如果在Spinner中选择项目之前在EditText中输入了内容，则肯定按钮将保持禁用状态。我不知道如何使这两个一起工作。
任何帮助将不胜感激。谢谢。
private void openDialog(){
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
View subView = inflater.inflate(R.layout.dialog_layout, null);
final EditText subEditTextExchangeRate = subView.findViewById(R.id.textInputExchangeRate);
final Spinner subSpinner = subView.findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currency, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
subSpinner.setAdapter(adapter);
subSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if(parent.getItemAtPosition(position).equals("Select currency")){
currencyName = "";
}else {
currencyName = parent.getItemAtPosition(position).toString();
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(subView);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
exchangeRate = subEditTextExchangeRate.getText().toString();
st2 = exchangeRate;
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
final AlertDialog alertDialog = builder.create();
alertDialog.show();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
subEditTextExchangeRate.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String exchangeRateInput = subEditTextExchangeRate.getText().toString();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(!exchangeRateInput.isEmpty() && !currencyName.isEmpty());
}//This is the logic that I am looking for but the method is watching only EditText
@Override
public void afterTextChanged(Editable s) {
}
});
}
答案 0 :(得分：0)
您应该调用微调器的按钮启用/禁用逻辑<html>
<head>
<style>
#hide{
z-index: 10000;
position: relative;
top: -54px;
padding: ;
width: 9%;
opacity: 0;
height: 22px;
}
#hide:checked~h2{
display: block;
}
h2{
display: none;
}
</style>
<title></title>
</head>
<body>
<h1>Click me</h1>
<input type="checkbox" id="hide" />
<h2>I'll appear when you click h1 !!!</h2>
</body>
</html>
。截至目前，您只在检查Spinner.onItemSelected中的逻辑。
EditText.onTextChanged和AlertDialog上设置侦听器之前，声明您的Spinner。EditText中添加启用或禁用按钮的逻辑。Spinner.onItemSelected中添加启用或禁用按钮的逻辑。答案 1 :(得分：0)
请尝试以下代码，仅做一次更改，将其放在subSpinner.setOnItemSelectedListener中的行下方，并请全局声明AlertDialog。
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(!exchangeRateInput.isEmpty() && !currencyName.isEmpty());
这是您的代码。
private void openDialog(){
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
View subView = inflater.inflate(R.layout.dialog_layout, null);
final EditText subEditTextExchangeRate = subView.findViewById(R.id.textInputExchangeRate);
final Spinner subSpinner = subView.findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currency, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
subSpinner.setAdapter(adapter);
subSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if(parent.getItemAtPosition(position).equals("Select currency")){
currencyName = "";
}else {
currencyName = parent.getItemAtPosition(position).toString();
}
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(!exchangeRateInput.isEmpty() && !currencyName.isEmpty());
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(subView);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
exchangeRate = subEditTextExchangeRate.getText().toString();
st2 = exchangeRate;
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog = builder.create();
alertDialog.show();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
subEditTextExchangeRate.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String exchangeRateInput = subEditTextExchangeRate.getText().toString();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(!exchangeRateInput.isEmpty() && !currencyName.isEmpty());
}//This is the logic that I am looking for but the method is watching only EditText
@Override
public void afterTextChanged(Editable s) {
}
});
}
答案 2 :(得分：0)
如果您更改代码，则可以使您的代码生效，
Button button = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
button.setEnabled(false);
subEditTextExchangeRate.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(s.length>0 && !TextUtils.isEmpty(currencyName )){
button.setEnabled(true);
// your logic
}else{
button.setEnabled(false);
// your logic
}
@Override
public void afterTextChanged(Editable s) {
}
});
->这将完成您的工作。