如何从 Android 中的对话框片段中删除 "OK" 按钮

Question

我正在尝试完全删除“确定”按钮，以便在选择项目时自动单击它。我注意到这是 Android 的首选方式。我不需要 "cancel" 按钮，因为我想防止选择空值。

对话框片段

public class SingleChoiceClass extends 
DialogFragment {`

final CharSequence[] items = {"b1", "b2", "b3", "b4"};
String selection;
@NonNull
@Override


public Dialog onCreateDialog(Bundle savedInstanceState) {

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());`


builder.setTitle("Choose").setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface arg0, int arg1) {
    switch (arg1){
        case 0:
            selection = (String) items[arg1];
            break;
        case 1:
            selection = (String) items[arg1];
            break;
        case 2:
            selection = (String) items[arg1];
            break;
        case 3:
            selection = (String) items[arg1];
            break;

            }

    }
}).setPositiveButton("OK", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {


        // Display toast with the user's selection
        Toast.makeText(getActivity(), "Your choice is : " + selection, Toast.LENGTH_SHORT).show();

        }
    });
    return builder.create();
 }
}

代码按原样运行良好，我只想获取所选项目而无需单击 "OK" 按钮。它节省了用户的时间。

Answer 1

我不确定这是否是 Android 推荐的执行此操作的方法，但我终于想出了一种实现我想要的确切行为的方法。

public class SingleChoiceClass extends 
DialogFragment {

final CharSequence[] items = {"b1", "b2", "b3", "b4"};
String selection;
@NonNull
@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
final MainActivity activity = (MainActivity) getActivity();

builder.setTitle("Choose")
    .setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
switch (arg1){
    case 0:
        selection = (String) items[arg1];
        Toast.makeText(getActivity(), "" + selection,Toast.LENGTH_SHORT).show();
        // Do your magic
        dismiss();
        break;
    case 1:
        selection = (String) items[arg1];
        Toast.makeText(getActivity(), "" + selection,Toast.LENGTH_SHORT).show();
        // Do your magic
        dismiss();
        break;
    case 2:
        selection = (String) items[arg1];
        Toast.makeText(getActivity(), "" + selection,Toast.LENGTH_SHORT).show();
        // Do your magic
        dismiss();
        break;
    case 3:
        selection = (String) items[arg1];
        Toast.makeText(getActivity(), "" + selection,Toast.LENGTH_SHORT).show();
        // Do your magic
        dismiss();
        break;
        }
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {

        //Exit
        activity.finish(); //Or find a way to relaunch Dialog
    }
});
return builder.create();
 }
}

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