java - 保存 Button 的颜色并将其与 SharedPreferences 一起使用

Question

在android中，我有一个三个按钮yes no Maybe，这里按钮在用户点击时颜色会改变，并且根据用户点击的按钮存储为1 0 2。在这里，如果我关闭或只是执行某些操作并返回该按钮，它的颜色不会改变。看起来很正常。当我们返回应用程序时如何保持该颜色

这是是，否，也许按钮的代码

yesBtn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                        // highlight the button when clicked
                        yesBtn.setBackgroundColor(Color.YELLOW);
                        noBtn.setBackgroundColor(Color.BLUE);
                        maybeBtn.setBackgroundColor(Color.BLUE);
                        responseLayout.setVisibility(View.GONE);
                        //If user clicks yes button in invitation response layout,response would be stored as 1 for event user
                        final int response = 1;
                        final long eventId = eventMOs.get(position).getEventId();
                        userMO.setIsAttending(response);

                        new AsyncTask<Void, Void, String>() {
                            protected String doInBackground(Void... arg0) {
                                return userDelegate.updateEventUserRelationShipMapping(userMO, eventId);

                            }

                        }.execute(null, null, null);

                    }

                });
                noBtn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        yesBtn.setBackgroundColor(Color.BLUE);
                        noBtn.setBackgroundColor(Color.YELLOW);
                        maybeBtn.setBackgroundColor(Color.BLUE);
                        responseLayout.setVisibility(View.GONE);
                        //If user clicks no button in invitation response layout,response would be stored as 0 for event user
                        final int response = 0;
                        final long eventId = eventMOs.get(position).getEventId();
                        userMO.setIsAttending(response);

                        new AsyncTask<Void, Void, String>() {
                            protected String doInBackground(Void... arg0) {
                                return userDelegate.updateEventUserRelationShipMapping(userMO, eventId);

                            }

                        }.execute(null, null, null);
                    }
                });
                maybeBtn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        yesBtn.setBackgroundColor(Color.BLUE);
                        noBtn.setBackgroundColor(Color.BLUE);
                        maybeBtn.setBackgroundColor(Color.YELLOW);
                        responseLayout.setVisibility(View.GONE);
                        //If user clicks maybe button in invitation response layout,response would be stored as  for event user
                        final int response = 2;
                        userMO.setIsAttending(response);
                        final long eventId = eventMOs.get(position).getEventId();

                        new AsyncTask<Void, Void, String>() {
                            protected String doInBackground(Void... arg0) {
                                return userDelegate.updateEventUserRelationShipMapping(userMO, eventId);

                            }

                        }.execute(null, null, null);
                    }
                });

单击事件时会显示此是或否按钮event 是一个 ListView 。单击该 ListView 中的任何事件时，此 yes no Maybe 响应布局会显示

这里如何使用共享首选项，如果我在"is"按钮下使用共享首选项，如下所示

SharedPreferences prefs = getSharedPreferences("mypref", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();

它显示错误无法解析方法 getSharedPreferences

Answer 1

无论您是否单击该按钮，只需保存在共享首选项中即可。并将此代码放入 onClick 按钮中

SharedPreference sharedpreferences prefs =   
getSharedPreferences("UI_Elements", Context.MODE_PRIVATE);

Editor editor = prefs.edit;
editor.putString("buttonClicked","true");
editor.commit();

现在您需要在 onCreate() 中检查您的按钮是否被单击。检查值为

if(prefs.getString("buttonClicked","false").equals("true")){

//单击按钮后您想要提供的任何颜色都在此处给出。

yesBtn.setBackgroundColor(Color.BLUE);

}