停用 AlertDialog "OK" 按钮,直到在 AlertDialog 视图的 EditText 上键入文本

Deactivate AlertDialog "OK" button till a text is typed on the EditText of the AlertDialog view

在 android studio 中,我需要停用 AlertDialog 的肯定(确定)按钮,直到用户输入 EditText

只需创建一个自定义警报对话框,然后应用您的逻辑。

LayoutInflater layoutInflaterAndroid = LayoutInflater.from(context);
        View mView = layoutInflaterAndroid.inflate(R.layout.your_dialog_xml, null);
        AlertDialog.Builder alertDialogBuilderUserInput = new AlertDialog.Builder(context);
        alertDialogBuilderUserInput.setView(mView);
        alertDialogBuilderUserInput.setCancelable(false);

        final AlertDialog alertDialogAndroid = alertDialogBuilderUserInput.create();

        final TextView tv_title = mView.findViewById(R.id.tv_title);
        final EditText et_message = mView.findViewById(R.id.et_message);
        final Button bt_ok = mView.findViewById(R.id.bt_ok);
        final Button bt_cancel = mView.findViewById(R.id.bt_cancel);

        tv_message.setText(message);

        bt_ok.setText(ok_text);
        bt_cancel.setText(cancel_text);

// set on text change listener and enable buttons as per your choice
et_message.set....

        bt_ok.setOnClickListener(view -> {
            alertDialogAndroid.cancel();
            if (callback != null) callback.onSubmit("");
        });
        bt_cancel.setOnClickListener(view -> {
            alertDialogAndroid.cancel();
            if (callback != null) callback.onCancel();
        });

        alertDialogAndroid.show();

试试这个代码希望它能帮到你

 bt_ok.setenable(false);

并在文本更改时启用它

bt_ok.setenable(true);

首先,您应该在布局文件夹中创建一个自定义警报对话框。

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="top"
        android:layout_margin="10dp"
        android:textSize="15sp"
        android:hint="@string/hint"
        android:inputType="textCapWords"
        android:singleLine="true"
        android:layout_marginTop="10dp"
        android:background="@null"
        android:maxLines="1"
        android:scrollbars="vertical"
        android:importantForAutofill="no" />
    
</LinearLayout>

然后是上面给出的编辑文本的布局充气器,以便我们的警报对话框能够显示并获取其中写入的文本。

LayoutInflater layoutInflater= this.getLayoutInflater();
final View view = layoutInflater.inflate(R.layout.dialog, null);
EditText editText = view.findViewById(R.id.edit_text);

之后,我们需要创建一个警告对话框。这里需要的是通过传递我们创建的最终视图来使用 setView() 函数指定编辑文本。由于您没有取消按钮,我们不需要在此处调用 builder.setCancelable(false)

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(view);
builder.setPositiveButton("OK", (dialogInterface, i) -> {
    //Whatever you would like to do after pressing the OK button.
});

AlertDialog dialog = builder.create();
dialog.show();

为了得到OK按钮,我们需要通过对话框的getButton()函数来调用。请记住,您需要调用 setEnabled(false) 以便默认情况下禁用它。

Button button = dialog.getButton(DialogInterface.BUTTON_POSITIVE);
button.setEnabled(false);

最后一步是将文本观察器添加到编辑文本,以便在键入任何内容时通知我们。

editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                if (editText.getText().length() > 0){
                    button.setEnabled(true);
                }else{
                    button.setEnabled(false);
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });

函数中的最终代码应如下所示:

public void getAlertDialog() {
        LayoutInflater layoutInflater= this.getLayoutInflater();
        final View view = layoutInflater.inflate(R.layout.dialog, null);
        EditText editText = view.findViewById(R.id.edit_text);

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setView(view);
        builder.setPositiveButton("OK", (dialogInterface, i) -> {
            //Whatever you would like to do after pressing the OK button.
        });

        AlertDialog dialog = builder.create();
        dialog.show();

        Button button = dialog.getButton(DialogInterface.BUTTON_POSITIVE);
        button.setEnabled(false);
        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                if (editText.getText().length() > 0){
                    button.setEnabled(true);
                }else{
                    button.setEnabled(false);
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
    }