Android 打开关闭闪光灯工具类

整合了个Android闪光灯工具类
API23以上使用Camera2，API23以下使用旧版的Camera。

直接上代码
import android.content.Context;import android.content.pm.PackageManager;import android.hardware.Camera;import android.hardware.camera2.CameraAccessException;import android.hardware.camera2.CameraManager;import android.os.Build;public class FlashlightHelper {    private boolean flashlightAvailable;    private Camera camera;    private CameraManager cameraManager;    private String cameraId;    public FlashlightHelper(Context context) {        flashlightAvailable = context.getApplicationContext().getPackageManager()                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {            cameraManager = (CameraManager) context.getApplicationContext().getSystemService(Context.CAMERA_SERVICE);            try {                if (cameraManager != null) {                    cameraId = cameraManager.getCameraIdList()[0];                }            } catch (CameraAccessException e) {                e.printStackTrace();            }        }    }    /**     * 开启闪光灯     *     * @return 是否开启成功     */    public boolean open() {        if (!flashlightAvailable) {            return false;        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {            try {                cameraManager.setTorchMode(cameraId, true);                return true;            } catch (CameraAccessException e) {                e.printStackTrace();                return false;            }        } else {            try {                camera = Camera.open();                camera.startPreview();                Camera.Parameters parameters = camera.getParameters();                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);                camera.setParameters(parameters);                return true;            } catch (Exception e) {                e.printStackTrace();                return false;            }        }    }    /**     * 关闭闪光灯     *     * @return 是否关闭成功     */    public boolean close() {        if (!flashlightAvailable) {            return false;        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {            try {                cameraManager.setTorchMode(cameraId, false);                return true;            } catch (CameraAccessException e) {                e.printStackTrace();                return false;            }        } else {            try {                if (camera != null) {                    Camera.Parameters parameters = camera.getParameters();                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);                    camera.setParameters(parameters);                    camera.stopPreview();                    camera.release();                    camera = null;                } else {                    return false;                }                return true;            } catch (Exception e) {                e.printStackTrace();                return false;            }        }    }}
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