111 lines
3.3 KiB
Java
111 lines
3.3 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Handler;
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import android.os.Message;
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import android.os.UEventObserver;
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import android.util.Log;
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import java.io.FileReader;
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import java.io.FileNotFoundException;
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/**
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* <p>DockObserver monitors for a docking station.
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*/
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class DockObserver extends UEventObserver {
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private static final String TAG = DockObserver.class.getSimpleName();
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private static final boolean LOG = false;
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private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
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private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";
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private int mDockState;
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private boolean mPendingIntent;
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private final Context mContext;
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public DockObserver(Context context) {
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mContext = context;
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startObserving(DOCK_UEVENT_MATCH);
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init(); // set initial status
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}
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@Override
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public void onUEvent(UEventObserver.UEvent event) {
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if (Log.isLoggable(TAG, Log.VERBOSE)) {
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Log.v(TAG, "Dock UEVENT: " + event.toString());
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}
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try {
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update(Integer.parseInt(event.get("SWITCH_STATE")));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Could not parse switch state from event " + event);
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}
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}
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private synchronized final void init() {
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char[] buffer = new char[1024];
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int newState = mDockState;
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try {
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FileReader file = new FileReader(DOCK_STATE_PATH);
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int len = file.read(buffer, 0, 1024);
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newState = Integer.valueOf((new String(buffer, 0, len)).trim());
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} catch (FileNotFoundException e) {
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Log.w(TAG, "This kernel does not have dock station support");
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} catch (Exception e) {
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Log.e(TAG, "" , e);
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}
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update(newState);
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}
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private synchronized final void update(int newState) {
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if (newState != mDockState) {
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mDockState = newState;
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mPendingIntent = true;
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mHandler.sendEmptyMessage(0);
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}
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}
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private synchronized final void sendIntent() {
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Log.d(TAG, "Broadcasting dock state " + mDockState);
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// Pack up the values and broadcast them to everyone
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Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
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intent.putExtra(Intent.EXTRA_DOCK_STATE, mDockState);
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mContext.sendStickyBroadcast(intent);
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}
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private final Handler mHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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if (mPendingIntent) {
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sendIntent();
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mPendingIntent = false;
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}
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}
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};
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}
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