android - 在单选警报对话框中启用/禁用肯定按钮

Question

如果您能帮我解决这个问题，我有一个包含 3 个选项的单选警报对话框。我最初禁用了 NEXT 按钮(没有选择任何选项)。当用户选择任何选项时，我想启用 NEXT 按钮。这是我试过的代码。

int involvementInIncident;

case DIALOG_ADD_A_PERSON_INVOLVEMENT_ONE: 

        builder.setTitle("Involvement in this Incident");   
        builder.setSingleChoiceItems(incidentInvolvement, -1,
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        involvementInIncident = which;                          
                        //involvementInIncident = ((AlertDialog)dialog).getListView().getCheckedItemPosition();
                        Toast.makeText(getApplicationContext(),""+ involvementInIncident, Toast.LENGTH_SHORT).show();


                    }
                });         
        builder.setPositiveButton("Next",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {                    
                        //Toast.makeText(getApplicationContext(),""+ involvementInIncident, Toast.LENGTH_SHORT).show();
                        showDialog(DIALOG_ADD_A_PERSON_PERSON_TYPE_TWO);

                    }

                });
        builder.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();


                    }
                });     
        AlertDialog alertInvolvement = builder.create();
        alertInvolvement.show();             
        final Button buttonPositiveInvolvement = alertInvolvement.getButton(AlertDialog.BUTTON_POSITIVE);
        buttonPositiveInvolvement.setEnabled(false);

        if(involvementInIncident == 0 || involvementInIncident == 1 || involvementInIncident==2){
            buttonPositiveInvolvement.setEnabled(true);
            //Toast.makeText(getApplicationContext(),"person responsiblee", Toast.LENGTH_SHORT).show();

        }
        else
        {
            buttonPositiveInvolvement.setEnabled(false);
        }

        return dialog;

非常感谢您的帮助。谢谢

Answer 1

终于搞定了。感谢 Piyush 和 Mystic Magic 的帮助。在这里发布代码，可能会对其他人有所帮助。全局初始化的buttonPositiveInvolvement按钮buttonPositiveInvolvement;

总结:在选择项目时启用/禁用单选 AlertDialog 中的肯定按钮。 (最初 NEXT 按钮被禁用，当一个项目被选中时它启用 NEXT 按钮)

//全局按钮buttonPositiveInvolvement;

案例 DIALOG_ADD_A_PERSON_INVOLVEMENT_ONE:

        builder.setTitle("Involvement in this Incident");   
        builder.setSingleChoiceItems(incidentInvolvement, -1,
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {                                            
                        //to enable the the NEXT button
                        buttonPositiveInvolvement.setEnabled(true);

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

                        showDialog(DIALOG_ADD_A_PERSON_PERSON_TYPE_TWO);

                    }

                });
        builder.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();


                    }
                });             
        //This sequence needs to be followed to get it working or else it might screw up
        AlertDialog alertInvolvement = builder.create();            
        alertInvolvement.show();
        buttonPositiveInvolvement = alertInvolvement.getButton(AlertDialog.BUTTON_POSITIVE);            
        buttonPositiveInvolvement.setEnabled(false);

        return dialog;