Android获取前置摄像头实现静默拍照
Posted ricardoldc
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android获取前置摄像头静默拍照
在实现入侵警报功能时需要获取系统前置摄像头实现后台静默拍照,并将数据存储到数据库中以备用户查看。具体步骤如下:
1.获取使用相机权限
ActivityCompat.requestPermissions(SomeActivity.this,new String[]Manifest.permission.CAMERA,1);
2.在拍照所在activity对应的xml文件中添加宽高为0.1dp的SurfaceView
<SurfaceView
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:id="@+id/camera_surfaceview"
app:layout_constraintTop_toTopOf="parent"
android:layout_width="0.1dp"
android:layout_height="0.1dp"
/>
3.在activity中进行摄像头获取、初始化等相关操作
1、初始化
SurfaceViewHolder myHolder = surfaceViewHolder.getHolder();
myHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
2、获取摄像头
Camera camera = getCamera();
/**
* 获取前置摄像头
* @return
*/
public Camera getCamera()
camera = null;
Camera.CameraInfo info = new Camera.CameraInfo();
int cnt = Camera.getNumberOfCameras();
for (int i = 0;i<cnt;i++)
Camera.getCameraInfo(i,info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
try
camera = Camera.open(i);
catch (RuntimeException e)
e.printStackTrace();
return camera;
3、调用摄像头进行拍照
if (camera != null)
try
camera.setPreviewDisplay(myHolder);
camera.startPreview();
camera.takePicture(null, null, jpeg);
camera.setErrorCallback(callback);
catch(IOException e)
e.printStackTrace();
camera.stopPreview();
camera.release();
camera=null;
else
// camera为空
//onCreate()函数外部
final Camera.PictureCallback jpeg = (data, camera) ->
//根据拍照所得数据创建位图
Bitmap bitmap = BitmapFactory.decodeByteArray(data,0,data.length);
//执行照片存储等相关操作,注意bitmap的回收
//...
camera.stopPreview();
;
Camera.ErrorCallback callback = new Camera.ErrorCallback()
@Override
public void onError(int error, Camera camera)
switch (error)
case Camera.CAMERA_ERROR_SERVER_DIED:
Log.e("error", "Camera.CAMERA_ERROR_SERVER_DIED");
//这里重新初始化Camera即可
break;
case Camera.CAMERA_ERROR_UNKNOWN:
Log.e("error", "Camera.CAMERA_ERROR_UNKNOWN");
break;
;
4.在onDestroy()中进行Camera对象的回收处理
@Override
public void onDestroy()
super.onDestroy();
if (camera != null)
camera.release();
camera = null;
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