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/*
* Copyright (C) 2015 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 android.service.media;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
/**
* Extend this class to implement a camera prewarm service. See
* {@link android.provider.MediaStore#META_DATA_STILL_IMAGE_CAMERA_PREWARM_SERVICE}.
*/
public abstract class CameraPrewarmService extends Service {
/**
* Intent action to bind the service as a prewarm service.
* @hide
*/
public static final String ACTION_PREWARM =
"android.service.media.CameraPrewarmService.ACTION_PREWARM";
/**
* Message sent by the client indicating that the camera intent has been fired.
* @hide
*/
public static final int MSG_CAMERA_FIRED = 1;
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_CAMERA_FIRED:
mCameraIntentFired = true;
break;
default:
super.handleMessage(msg);
}
}
};
private boolean mCameraIntentFired;
@Override
public IBinder onBind(Intent intent) {
if (ACTION_PREWARM.equals(intent.getAction())) {
onPrewarm();
return new Messenger(mHandler).getBinder();
} else {
return null;
}
}
@Override
public boolean onUnbind(Intent intent) {
if (ACTION_PREWARM.equals(intent.getAction())) {
onCooldown(mCameraIntentFired);
}
return false;
}
/**
* Called when the camera should be prewarmed.
*/
public abstract void onPrewarm();
/**
* Called when prewarm phase is done, either because the camera launch intent has been fired
* at this point or prewarm is no longer needed. A client should close the camera
* immediately in the latter case.
* <p>
* In case the camera launch intent has been fired, there is no guarantee about the ordering
* of these two events. Cooldown might happen either before or after the activity has been
* created that handles the camera intent.
*
* @param cameraIntentFired Indicates whether the intent to launch the camera has been
* fired.
*/
public abstract void onCooldown(boolean cameraIntentFired);
}
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