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/*
* 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.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
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.util.Log;
import android.util.Slog;
import android.widget.Toast;
import android.view.IWindowManager;
import android.os.ServiceManager;
import android.os.RemoteException;
import android.os.AsyncTask;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
/**
* <p>RotationLockObserver monitors for rotation lock switch state
*/
class RotationSwitchObserver extends UEventObserver {
private static final String TAG = RotationSwitchObserver.class
.getSimpleName();
private static final boolean LOG = true;
private static final String LOCK_UEVENT_MATCH =
"DEVPATH=/devices/virtual/switch/rotationlock";
private static final String LOCK_STATE_PATH =
"/sys/class/switch/rotationlock/state";
private static final int MSG_LOCK_STATE = 0;
private int mLockState;
private int mPreviousLockState;
private boolean mSystemReady;
private final Context mContext;
private boolean mAutoRotation;
public RotationSwitchObserver(Context context) {
mContext = context;
init(); // set initial status
startObserving(LOCK_UEVENT_MATCH);
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Slog.v(TAG, "Switch UEVENT: " + event.toString());
}
synchronized (this) {
try {
int newState = Integer.parseInt(event.get("SWITCH_STATE"));
if (newState != mLockState) {
mPreviousLockState = mLockState;
mLockState = newState;
if (mSystemReady) {
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(LOCK_STATE_PATH);
int len = file.read(buffer, 0, 1024);
file.close();
mPreviousLockState = mLockState =
Integer.valueOf((new String(buffer, 0, len)).trim());
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have rotation switch support");
} catch (NumberFormatException e) {
Slog.e(TAG, "" , e);
} catch (IOException e) {
Slog.e(TAG, "" , e);
}
}
void systemReady() {
synchronized (this) {
mSystemReady = true;
}
}
private final void update() {
mHandler.sendEmptyMessage(MSG_LOCK_STATE);
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_LOCK_STATE:
synchronized (this) {
boolean autoRotate = mLockState == 0;
int toastId = autoRotate
? com.android.internal.R.string.toast_rotation_unlocked
: com.android.internal.R.string.toast_rotation_locked;
setAutoRotation(autoRotate);
Toast.makeText(mContext, mContext.getString(toastId),
Toast.LENGTH_SHORT).show();
break;
}
}
}
};
private void setAutoRotation(final boolean autorotate) {
mAutoRotation = autorotate;
AsyncTask.execute(new Runnable() {
public void run() {
try {
IWindowManager wm = IWindowManager.Stub.asInterface(
ServiceManager
.getService(Context.WINDOW_SERVICE));
if (autorotate) {
wm.thawRotation();
} else {
wm.freezeRotation(-1);
}
} catch (RemoteException exc) {
Log.w(TAG, "Unable to save auto-rotate setting");
}
}
});
}
}
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