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/*
* Copyright (C) 2014 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.testingcamera2;
import java.util.HashSet;
import java.util.Set;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraAccessException;
/**
* A central manager of camera devices and current clients for them.
*
*/
public class CameraOps2 extends CameraManager.AvailabilityCallback {
private final CameraManager mCameraManager;
private final Activity mActivity;
private final Set<CameraDevice> mOpenCameras = new HashSet<CameraDevice>();
// For persisting values for permission requests
private static final int PERMISSIONS_REQUEST_CAMERA = 1;
private String mDelayedOpenId = null;
private CameraDevice.StateCallback mDelayedOpenListener = null;
public CameraOps2(Activity activity) {
mActivity = activity;
mCameraManager = (CameraManager) activity.getSystemService(Activity.CAMERA_SERVICE);
if (mCameraManager == null) {
throw new AssertionError("Can't connect to camera manager!");
}
try {
String[] cameraIds = mCameraManager.getCameraIdList();
TLog.i("Camera count: %d", cameraIds.length);
for (String cameraId : cameraIds) {
TLog.i(" Camera %s", cameraId);
}
} catch (CameraAccessException e) {
TLog.e("Unable to get camera list: %s", e);
}
mCameraManager.registerAvailabilityCallback(this, /*handler*/null);
}
/**
* Add a listener for new camera addition events, and retrieve the list of
* current cameras
*
* @param listener
* A listener to notify on changes to camera availability
* @return the current list of available cameras
* @throws CameraAccessException
* if the camera manager cannot be queried
*/
public String[] getCamerasAndListen(CameraManager.AvailabilityCallback listener)
throws CameraAccessException {
mCameraManager.registerAvailabilityCallback(listener, /*handler*/null);
return mCameraManager.getCameraIdList();
}
public void removeAvailabilityCallback(CameraManager.AvailabilityCallback listener) {
mCameraManager.unregisterAvailabilityCallback(listener);
}
@Override
public void onCameraAvailable(String cameraId) {
TLog.i("Camera %s is now available", cameraId);
}
@Override
public void onCameraUnavailable(String cameraId) {
TLog.i("Camera %s is now unavailable", cameraId);
}
/**
* Attempt to open a camera device. Returns false if the open call cannot be
* made or the device is already open
*
* @param cameraId id of the camera to open
* @param listener listener to notify of camera device state changes
* @return true if open call was sent successfully. The client needs to wait
* for its listener to be called to determine if open will succeed.
*/
public boolean openCamera(String cameraId, CameraDevice.StateCallback listener) {
for (CameraDevice camera : mOpenCameras) {
if (camera.getId() == cameraId) {
TLog.e("Camera %s is already open", cameraId);
return false;
}
}
if (mActivity.checkSelfPermission(Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
TLog.i("Requesting camera permissions");
mDelayedOpenId = cameraId;
mDelayedOpenListener = listener;
mActivity.requestPermissions(new String[] {Manifest.permission.CAMERA},
PERMISSIONS_REQUEST_CAMERA);
return false;
}
return doOpenCamera(cameraId, listener);
}
private boolean doOpenCamera(String cameraId, CameraDevice.StateCallback listener) {
try {
DeviceStateCallback proxyListener = new DeviceStateCallback(listener);
mCameraManager.openCamera(cameraId, proxyListener, null);
} catch (CameraAccessException e) {
TLog.e("Unable to open camera %s.", e, cameraId);
return false;
}
return true;
}
public void onRequestPermissionsResult (int requestCode, String[] permissions,
int[] grantResults) {
if (requestCode == PERMISSIONS_REQUEST_CAMERA) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
TLog.i("Camera permission granted");
if (mDelayedOpenId != null && mDelayedOpenListener != null) {
doOpenCamera(mDelayedOpenId, mDelayedOpenListener);
}
mDelayedOpenId = null;
mDelayedOpenListener = null;
} else {
TLog.i("Camera permission denied, not opening camera");
if (mDelayedOpenId != null && mDelayedOpenListener != null) {
mDelayedOpenListener.onError(null,
CameraDevice.StateCallback.ERROR_CAMERA_DISABLED);
mDelayedOpenId = null;
mDelayedOpenListener = null;
}
}
if (grantResults[1] == PackageManager.PERMISSION_GRANTED) {
TLog.i("Storage permission granted");
} else {
TLog.i("Storage permission not granted; saving will not work");
}
}
}
public CameraCharacteristics getCameraInfo(String cameraId) {
try {
return mCameraManager.getCameraCharacteristics(cameraId);
} catch (CameraAccessException e) {
TLog.e("Unable to get camera characteristics for camera %s.", e, cameraId);
}
return null;
}
private class DeviceStateCallback extends CameraDevice.StateCallback {
private final CameraDevice.StateCallback mClientListener;
public DeviceStateCallback(CameraDevice.StateCallback clientListener) {
mClientListener = clientListener;
}
@Override
public void onClosed(CameraDevice camera) {
mOpenCameras.remove(camera);
TLog.i("Camera %s now closed", camera.getId());
mClientListener.onClosed(camera);
}
@Override
public void onDisconnected(CameraDevice camera) {
TLog.i("Camera %s now disconnected", camera.getId());
mClientListener.onDisconnected(camera);
}
@Override
public void onError(CameraDevice camera, int error) {
TLog.i("Camera %s encountered error: %d", camera.getId(), error);
mClientListener.onError(camera, error);
}
@Override
public void onOpened(CameraDevice camera) {
mOpenCameras.add(camera);
TLog.i("Camera %s now open", camera.getId());
mClientListener.onOpened(camera);
}
}
}
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