java - 更新按钮的异步任务

Question

如果我有条件，如何更新我的 UI 按钮以禁用按钮开/关。条件:如果我得到的值 = 1.0，则按钮电源打开被禁用；如果我得到的值 0，则按钮电源关闭被禁用。我希望按钮始终显示新值。

这是我的代码:

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_controller, container, false);
        mSwitchStatus  = (TextView) rootView.findViewById(R.id.statusSwitch);
        ImageButton On = (ImageButton)rootView.findViewById(R.id.on);
        ImageButton Off = (ImageButton)rootView.findViewById(R.id.off);


        callAsynchronousTask();

            On.setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View v)
                {
                    Toast.makeText(getActivity().getApplication(), "ON", Toast.LENGTH_SHORT).show();
                    SendApi sendApi = new SendApi();
                    sendApi.execute();
                }
            });

            Off.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v)
                {
                    Toast.makeText(getActivity().getApplication(), "OFF", Toast.LENGTH_SHORT).show();
                    SendApi sendApi = new SendApi();
                    sendApi.execute();
                }
            });
        // Inflate the layout for this fragment
        return rootView;
    }

重复异步任务

public void callAsynchronousTask() {
        final Handler handler = new Handler();
        Timer timer = new Timer();
        TimerTask doAsynchronousTask = new TimerTask() {
            @Override
            public void run() {
                handler.post(new Runnable() {
                    public void run() {
                        try {
                            GetApi getApi = new GetApi();
                            getApi.execute();

                        } catch (Exception e) {
                            android.util.Log.i("Error", "Error");
                            // TODO Auto-generated catch block
                        }
                    }
                });
            }
        };
        timer.schedule(doAsynchronousTask, 0, 100);
    }

GETApi 的异步任务

public class GetApi extends AsyncTask<Object, Object, Value[]> {
        private final String API_KEY = "xxxxxxxxxxxxxxxxxxxxxxxxxx";
        private final String SWITCHID = "xxxxxxxxxxxxxxxxxxxxxxxxx"; 
        private ImageButton On,Off ;

        @Override
        protected Value[] doInBackground(Object... params) {
            ApiClient apiClient = new ApiClient(API_KEY);
            Variable statusSwitch = apiClient.getVariable(SWITCHID);
            Value[] variableValues = statusSwitch.getValues();

            return variableValues;
        }
        @Override
        protected void onPostExecute(Value[] variableValues) {

            String status = Double.toString(variableValues[0].getValue());
            mSwitchStatus.setText(status);

            if(status.equals("1.0")){
                On.setVisibility(View.INVISIBLE);
            }

        }
    }

Fragment_controller.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#1d4851"
    tools:context=".activity.ControllerFragment">

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/off"
        android:src="@drawable/ic_off"
        android:background="@null"
        android:layout_marginTop="79dp"
        android:layout_below="@+id/textView2"
        android:layout_alignLeft="@+id/on"
        android:layout_alignStart="@+id/on"/>

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/on"
        android:background="@null"
        android:src="@drawable/ic_on"
        android:layout_marginTop="87dp"
        android:layout_alignTop="@+id/off"
        android:layout_centerHorizontal="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Water Pump Controller "
        android:id="@+id/textView2"
        android:textColor="#ffffff"
        android:textSize="20dp"
        android:layout_marginTop="19dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="  "
        android:id="@+id/statusSwitch"
        android:textColor="#ffffff"
        android:textSize="20dp"
        android:layout_marginTop="250dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

Answer 1

您已在 onCreateView 中初始化按钮，例如

ImageButton On = (ImageButton)rootView.findViewById(R.id.on); 

并尝试在 onPostExecute() 中访问它。它们不是全局的。

要禁用，您必须调用 setEnable(false) 而不是 setVisibility

您也可以按照Rathna Kumaran所说的方式发送。

public class GetApi extends AsyncTask<Object, Object, Value[]> {
        private Button button;
        public GetApi(Button mButton){
            this.button = button;
        }
        private final String API_KEY = "xxxxxxxxxxxxxxxxxxxxxxxxxx";
        private final String SWITCHID = "xxxxxxxxxxxxxxxxxxxxxxxxx";

        @Override
        protected Value[] doInBackground(Object... params) {
            ApiClient apiClient = new ApiClient(API_KEY);
            Variable statusSwitch = apiClient.getVariable(SWITCHID);
            Value[] variableValues = statusSwitch.getValues();

            return variableValues;
        }
        @Override
        protected void onPostExecute(Value[] variableValues) {

            String status = Double.toString(variableValues[0].getValue());
            mSwitchStatus.setText(status);

            if(status.equals("1.0")){
                button.setVisibility(View.INVISIBLE);
            }

        }
    }