java - 创建 alertDialog 后无法解析 getButton 方法

Question

我试图通过在 stackoverflow 上阅读来解决这个问题，我也试图更好地理解 getButton 方法的使用，直接从 android studio 网站读取。在直接来自 developer.android.com 的描述下方(粗体是我的):

public Button getButton (int whichButton)

Gets one of the buttons used in the dialog. Returns null if the specified button does not exist or the dialog has not yet been fully created (for example, via Dialog.show() or Dialog.create()).

MapsActivity.java

正如您在下面看到的，我在 Dialog.show() 之后使用了 getButton 方法，但是我得到了 error: cannot find symbol method getButton(int)
。你能告诉我是哪个问题吗？谢谢

...

case R.id.settings:

                    AlertDialog.Builder builder2 = new AlertDialog.Builder(this, R.style.SettingDialogStyle);

                    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    View v = inflater.inflate(R.layout.setting_alert_dialog, null);


                    SeekBar sb = (SeekBar) v.findViewById(R.id.seekBar2);
                    final TextView txtView = (TextView) v.findViewById(R.id.intervalValue);

                    sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                        @Override
                        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                            txtView.setText(String.valueOf(progress)+ " sec");


                        }

                        @Override
                        public void onStartTrackingTouch(SeekBar seekBar) {

                        }

                        @Override
                        public void onStopTrackingTouch(SeekBar seekBar) {

                        }
                    });


                    builder2.setView(v);
                    builder2.setTitle("Interval between updates");
                    builder2.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // User clicked OK button
                        }
                    });
                    builder2.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // User cancelled the dialog
                        }
                    });


                    builder2.show();

                    final Button positiveButton = builder2.getButton(DialogInterface.BUTTON_POSITIVE);
                    LinearLayout.LayoutParams positiveButtonLL = (LinearLayout.LayoutParams) positiveButton.getLayoutParams();
                    positiveButtonLL.gravity = Gravity.CENTER;
                    positiveButton.setLayoutParams(positiveButtonLL);


                    return true;

...

setting_alert_dialog.xml

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


    <TextView
        android:id="@+id/intervalValue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:textColor="#FFFFFF"
        android:text="TextView" />

    <SeekBar
        android:id="@+id/seekBar2"
        style="@style/Widget.AppCompat.SeekBar.Discrete"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="45dp"
        android:max="60"
        android:progress="3"
        android:progressTint="#FFFFFF"
        android:thumbTint="#FFFFFF" />
</RelativeLayout>

Answer 1

getButton() 是类 AlertDialog 而非 AlertDialog.Builder 的成员。
如果您更改为:
AlertDialog alertDialog = new AlertDialog(this, R.style.SettingDialogStyle);
然后你就可以访问 alertDialog.getButton()

替代方案，在这一行之后:

      AlertDialog.Builder builder2 = new AlertDialog.Builder(this, R.style.SettingDialogStyle);

通过这个:

AlertDialog alertDialog = builder2.create();

您有可以访问 getButton() 的警报对话框