以下のカスタム ダイアログをご覧ください。ダイアログに edittext フィールドがあり、テキスト フィールドが空の場合は を無効にしたいと思いますpositiveButton。テキスト フィールドの charListener を取得することはできますが、そのリスナーから を無効または有効に設定する方法がわかりませんpositivebutton。プラス ボタンとマイナス ボタンの参照は何ですか?
case DIALOG_TEXT_ENTRY:
// This example shows how to add a custom layout to an AlertDialog
LayoutInflater factory = LayoutInflater.from(this);
final View textEntryView = factory.inflate(R.layout.alert_dialog_text_entry, null);
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_text_entry)
.setView(textEntryView)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked cancel so do some stuff */
}
})
.create();
}
ベストアンサー1
完全な解決策のために編集します...
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("Alert dialog title");
builder.setMessage("This is the example code snippet to disable button if edittext attached to dialog is empty.");
builder.setPositiveButton("PositiveButton",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// DO TASK
}
});
builder.setNegativeButton("NegativeButton",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// DO TASK
}
});
// Set `EditText` to `dialog`. You can add `EditText` from `xml` too.
final EditText input = new EditText(MainActivity.this);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT
);
input.setLayoutParams(lp);
builder.setView(input);
final AlertDialog dialog = builder.create();
dialog.show();
// Initially disable the button
((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
// OR you can use here setOnShowListener to disable button at first time.
// Now set the textchange listener for edittext
input.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
// Check if edittext is empty
if (TextUtils.isEmpty(s)) {
// Disable ok button
((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
} else {
// Something into edit text. Enable the button.
((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(true);
}
}
});
以下は編集履歴です。詳細についてはこちらを参照してください。
サンプルコードはこちらです。試してみてください
AlertDialog.Builder builder = new AlertDialog.Builder(AddSchedule.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("Alert dialog title");
builder.setMessage("Dialog message");
builder.setPositiveButton("Button1", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
//DO TASK
}
});
builder.setNegativeButton("Button2", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
//DO TASK
}
});
AlertDialog dialog = builder.create();
dialog.show();
// After calling show method, you need to check your condition and enable/disable the dialog buttons
if (your_condition_true) {
// BUTTON1 is the positive button
dialog.getButton(AlertDialog.BUTTON1).setEnabled(false);
}
否定ボタンの場合
dialog.getButton(AlertDialog.BUTTON2).setEnabled(false); //BUTTON2 is negative button
ボタンIDの場合:参照 アラートダイアログ.xml
編集済み:
そしてその表示リスナーを設定するレベル8 API (FroYo) も同様です。
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.setOnShowListener(new OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
if (condition) {
((AlertDialog)dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
}
}
});
dialog.show();
編集済み
new AlertDialog.Builder(this)
.setMessage("This may take a while")
.setPositiveButton("OK", new android.content.DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
((AlertDialog)dialog).getButton(which).setVisibility(View.INVISIBLE);
// the rest of your stuff
}
}).show();