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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.connecteddevice.usb;
     18 
     19 import android.content.Context;
     20 import android.os.Handler;
     21 import android.support.annotation.UiThread;
     22 
     23 import com.android.internal.annotations.VisibleForTesting;
     24 import com.android.settings.core.PreferenceControllerMixin;
     25 import com.android.settingslib.core.AbstractPreferenceController;
     26 
     27 /**
     28  * This class provides common members and refresh functionality for usb controllers.
     29  */
     30 public abstract class UsbDetailsController extends AbstractPreferenceController
     31         implements PreferenceControllerMixin {
     32 
     33     protected final Context mContext;
     34     protected final UsbDetailsFragment mFragment;
     35     protected final UsbBackend mUsbBackend;
     36 
     37     @VisibleForTesting
     38     Handler mHandler;
     39 
     40     public UsbDetailsController(Context context, UsbDetailsFragment fragment, UsbBackend backend) {
     41         super(context);
     42         mContext = context;
     43         mFragment = fragment;
     44         mUsbBackend = backend;
     45         mHandler = new Handler(context.getMainLooper());
     46     }
     47 
     48     @Override
     49     public boolean isAvailable() {
     50         return true;
     51     }
     52 
     53     /**
     54      * Called when the USB state has changed, so that this component can be refreshed.
     55      *
     56      * @param connected Whether USB is connected
     57      * @param functions A mask of the currently enabled functions
     58      * @param powerRole The current power role
     59      * @param dataRole The current data role
     60      */
     61     @UiThread
     62     protected abstract void refresh(boolean connected, long functions, int powerRole, int dataRole);
     63 }
     64