Android：通过Camera进行拍照

android no

Android应用提供了Camera来控制拍照，其使用步骤如下：

• 1，通过Camera的open()方法打开相机(默认打开后置摄像头，也可以通过指定ID打开相应的摄像头)
• 2，通过Camera的getParameters()方法获取拍照参数对象
• 3，调用Camera的startPreview()方法开始预览取景，在取景前需要调用Camera的setPreviewDisplay(SurfaceHolder)设置显示
• 4，调用Camera的takePicture()方法拍照
• 5，调用Camera的stopPreview()取消预览，并调用release()方法释放资源

权限说明

<uses-permission android:name="android.permission.CAMERA"/>

Demo

注意：android.hardware.Camera已经被废弃，已经有了新的拍照架构camera2，这里的示例仍然是老的版本

class CaptureActivity : BaseActivity<IPresenter>() {
    var isPreview = false
    val camera: Camera = Camera.open()
    val path = "${Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).absolutePath}/Camera"
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_capture)
        camera.setDisplayOrientation(90)
        val parameters = camera.parameters
        parameters.setPreviewSize(width, height)//预览图片的大小
        parameters.setPreviewFpsRange(4, 10)//每秒显示帧数的最小值和最大值
        parameters.pictureFormat = ImageFormat.JPEG//保存图片的格式
        parameters.set("jpeg-quality", 100)//保存图片的质量
        parameters.setPictureSize(width, height)//保存照片的尺寸
        cSurfaceView.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS)
        cSurfaceView.holder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceChanged(holder: SurfaceHolder?, format: Int, width: Int, height: Int) {
            }
            override fun surfaceDestroyed(holder: SurfaceHolder?) {
                if (isPreview) camera.stopPreview()
                camera.release()
            }
            override fun surfaceCreated(holder: SurfaceHolder) {
                camera.setPreviewDisplay(holder)
                camera.startPreview()
            }
        })
        cCapture.setOnClickListener { capture() }
    }
    fun capture() {
        camera.autoFocus { success, camera ->
            if (success) {
                camera.takePicture({
                    //快门瞬间回调
                }, { data, camera ->
                    //图片原始信息回调
                }, { data, camera ->
                    //拍照完成回调
                    val file = FileUtils(path, DateUtils.getTimeStamp() + ".jpg")
                    file.clear()
                    file.append(data)
                    file.close()
                    camera.stopPreview()
                    camera.startPreview()
                    isPreview = true
                })
            }
        }
    }
}