Question

我正在尝试使用来自Docs的Alertdialog。但有一个问题。如果我重新旋转手机警报对话框，则会出现两个警报对话框。如何防止重新创建alertDialog。

这是我的代码：

   public class FireMissilesDialogFragment extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(R.string.dialog_fire_missiles)
               .setPositiveButton(R.string.fire, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // FIRE ZE MISSILES!
                   }
               })
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // User cancelled the dialog
                   }
               });
        // Create the AlertDialog object and return it
        return builder.create();
    }
}

这是显示方法：

public void confirmFireMissiles() {
    DialogFragment newFragment = new FireMissilesDialogFragment();
    newFragment.show(getSupportFragmentManager(), "missiles");
}

Answer 1

检查是否设置了savedInstanceState：

   public class FireMissilesDialogFragment extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        if (savedInstanceState == null) {
            // create new dialog
        }
   }

Answer 2

添加此

清单文件中android:configChanges="orientation|screenSize"标记内的

Activity属性。

AlertDialog在旋转后重新创建

2 个答案: