Android 带有正按钮并验证自定义 EditText 的 AlertDialog
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AlertDialog with positive button and validating custom EditText
提问by hsz
I have created simple AlertDialogwith positive and negative buttons. Positive button has registered DialogInterface.OnClickListener, where I get EditTextvalue. I have to validate it (for example if it has to be not null) and if value is not correct, disallow to close this dialog. How to prevent dismissing dialog after click and validate ?
我创造了简单AlertDialog的正面和负面按钮。正按钮已注册DialogInterface.OnClickListener，我从中获得EditText价值。我必须验证它（例如，如果它必须不为空），如果值不正确，则不允许关闭此对话框。单击并验证后如何防止关闭对话框？
回答by FoamyGuy
Dialog creation:
对话框创建：
AlertDialog.Builder builder = new AlertDialog.Builder(YourActivity.this);
builder.setCancelable(false)
.setMessage("Please Enter data")
.setView(edtLayout) //<-- layout containing EditText
.setPositiveButton("Enter", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//All of the fun happens inside the CustomListener now.
//I had to move it to enable data validation.
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
Button theButton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
theButton.setOnClickListener(new CustomListener(alertDialog));
CustomListener:
自定义监听器：
class CustomListener implements View.OnClickListener {
private final Dialog dialog;
public CustomListener(Dialog dialog) {
this.dialog = dialog;
}
@Override
public void onClick(View v) {
// put your code here
String mValue = mEdtText.getText().toString();
if(validate(mValue)){
dialog.dismiss();
}else{
Toast.makeText(YourActivity.this, "Invalid data", Toast.LENGTH_SHORT).show();
}
}
}
