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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.cts.managedprofile;
     18 
     19 import android.hardware.camera2.CameraDevice;
     20 import android.hardware.camera2.CameraManager;
     21 import android.os.Handler;
     22 import android.util.Log;
     23 
     24 import java.util.concurrent.CountDownLatch;
     25 import java.util.concurrent.TimeUnit;
     26 import java.util.concurrent.atomic.AtomicBoolean;
     27 
     28 /**
     29  * A util class to help open camera in a blocking way.
     30  */
     31 class CameraUtils {
     32 
     33     private static final String TAG = "CameraUtils";
     34 
     35     /**
     36      * @return true if success to open camera, false otherwise.
     37      */
     38     public static boolean blockUntilOpenCamera(CameraManager cameraManager, Handler handler) {
     39         try {
     40             String[] cameraIdList = cameraManager.getCameraIdList();
     41             if (cameraIdList == null || cameraIdList.length == 0) {
     42                 return false;
     43             }
     44             String cameraId = cameraIdList[0];
     45             CameraCallback callback = new CameraCallback();
     46             cameraManager.openCamera(cameraId, callback, handler);
     47             return callback.waitForResult();
     48         } catch (Exception ex) {
     49             // No matter what is going wrong, it means fail to open camera.
     50             ex.printStackTrace();
     51             return false;
     52         }
     53     }
     54 
     55     /**
     56      * {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state.
     57      */
     58     private static class CameraCallback extends CameraDevice.StateCallback {
     59 
     60         private static final int OPEN_TIMEOUT_SECONDS = 5;
     61 
     62         private final CountDownLatch mLatch = new CountDownLatch(1);
     63 
     64         private AtomicBoolean mResult = new AtomicBoolean(false);
     65 
     66         @Override
     67         public void onOpened(CameraDevice cameraDevice) {
     68             Log.d(TAG, "open camera successfully");
     69             mResult.set(true);
     70             if (cameraDevice != null) {
     71                 cameraDevice.close();
     72             }
     73             mLatch.countDown();
     74         }
     75 
     76         @Override
     77         public void onDisconnected(CameraDevice cameraDevice) {
     78             Log.d(TAG, "disconnect camera");
     79             mLatch.countDown();
     80         }
     81 
     82         @Override
     83         public void onError(CameraDevice cameraDevice, int error) {
     84             Log.e(TAG, "Fail to open camera, error code = " + error);
     85             mLatch.countDown();
     86         }
     87 
     88         public boolean waitForResult() throws InterruptedException {
     89             mLatch.await(OPEN_TIMEOUT_SECONDS, TimeUnit.SECONDS);
     90             return mResult.get();
     91         }
     92     }
     93 }
     94