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Android example source code file (DockObserver.java)

This example Android source code file (DockObserver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, audio, content, context, dock_state_path, dockobserver, filereader, handler, io, log, media, msg_dock_state, os, override, photo, powermanagerservice, sound, string, uri, video

The DockObserver.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.os.UEventObserver;
import android.provider.Settings;
import android.server.BluetoothService;
import android.util.Log;
import android.util.Slog;

import java.io.FileNotFoundException;
import java.io.FileReader;

/**
 * <p>DockObserver monitors for a docking station.
 */
class DockObserver extends UEventObserver {
    private static final String TAG = DockObserver.class.getSimpleName();
    private static final boolean LOG = false;

    private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
    private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";

    private static final int MSG_DOCK_STATE = 0;

    private int mDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
    private int mPreviousDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;

    private boolean mSystemReady;

    private final Context mContext;

    private PowerManagerService mPowerManager;

    public DockObserver(Context context, PowerManagerService pm) {
        mContext = context;
        mPowerManager = pm;
        init();  // set initial status

        startObserving(DOCK_UEVENT_MATCH);
    }

    @Override
    public void onUEvent(UEventObserver.UEvent event) {
        if (Log.isLoggable(TAG, Log.VERBOSE)) {
            Slog.v(TAG, "Dock UEVENT: " + event.toString());
        }

        synchronized (this) {
            try {
                int newState = Integer.parseInt(event.get("SWITCH_STATE"));
                if (newState != mDockState) {
                    mPreviousDockState = mDockState;
                    mDockState = newState;
                    if (mSystemReady) {
                        // Don't force screen on when undocking from the desk dock.
                        // The change in power state will do this anyway.
                        // FIXME - we should be configurable.
                        if (mPreviousDockState != Intent.EXTRA_DOCK_STATE_DESK ||
                                mDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
                            mPowerManager.userActivityWithForce(SystemClock.uptimeMillis(),
                                    false, true);
                        }
                        update();
                    }
                }
            } catch (NumberFormatException e) {
                Slog.e(TAG, "Could not parse switch state from event " + event);
            }
        }
    }

    private final void init() {
        char[] buffer = new char[1024];

        try {
            FileReader file = new FileReader(DOCK_STATE_PATH);
            int len = file.read(buffer, 0, 1024);
            mPreviousDockState = mDockState = Integer.valueOf((new String(buffer, 0, len)).trim());

        } catch (FileNotFoundException e) {
            Slog.w(TAG, "This kernel does not have dock station support");
        } catch (Exception e) {
            Slog.e(TAG, "" , e);
        }
    }

    void systemReady() {
        synchronized (this) {
            // don't bother broadcasting undocked here
            if (mDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
                update();
            }
            mSystemReady = true;
        }
    }

    private final void update() {
        mHandler.sendEmptyMessage(MSG_DOCK_STATE);
    }

    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_DOCK_STATE:
                    synchronized (this) {
                        Slog.i(TAG, "Dock state changed: " + mDockState);

                        final ContentResolver cr = mContext.getContentResolver();

                        if (Settings.Secure.getInt(cr,
                                Settings.Secure.DEVICE_PROVISIONED, 0) == 0) {
                            Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
                            return;
                        }
                        // Pack up the values and broadcast them to everyone
                        Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
                        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
                        intent.putExtra(Intent.EXTRA_DOCK_STATE, mDockState);

                        // Check if this is Bluetooth Dock
                        String address = BluetoothService.readDockBluetoothAddress();
                        if (address != null)
                            intent.putExtra(BluetoothDevice.EXTRA_DEVICE,
                                    BluetoothAdapter.getDefaultAdapter().getRemoteDevice(address));

                        // User feedback to confirm dock connection. Particularly
                        // useful for flaky contact pins...
                        if (Settings.System.getInt(cr,
                                Settings.System.DOCK_SOUNDS_ENABLED, 1) == 1)
                        {
                            String whichSound = null;
                            if (mDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
                                if (mPreviousDockState == Intent.EXTRA_DOCK_STATE_DESK) {
                                    whichSound = Settings.System.DESK_UNDOCK_SOUND;
                                } else if (mPreviousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
                                    whichSound = Settings.System.CAR_UNDOCK_SOUND;
                                }
                            } else {
                                if (mDockState == Intent.EXTRA_DOCK_STATE_DESK) {
                                    whichSound = Settings.System.DESK_DOCK_SOUND;
                                } else if (mDockState == Intent.EXTRA_DOCK_STATE_CAR) {
                                    whichSound = Settings.System.CAR_DOCK_SOUND;
                                }
                            }

                            if (whichSound != null) {
                                final String soundPath = Settings.System.getString(cr, whichSound);
                                if (soundPath != null) {
                                    final Uri soundUri = Uri.parse("file://" + soundPath);
                                    if (soundUri != null) {
                                        final Ringtone sfx = RingtoneManager.getRingtone(mContext, soundUri);
                                        if (sfx != null) {
                                            sfx.setStreamType(AudioManager.STREAM_SYSTEM);
                                            sfx.play();
                                        }
                                    }
                                }
                            }
                        }

                        mContext.sendStickyBroadcast(intent);
                    }
                    break;
            }
        }
    };
}

Other Android examples (source code examples)

Here is a short list of links related to this Android DockObserver.java source code file:

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