如何从 Android 中的自定义 CameraView 捕获图像? [英] How to capture image from custom CameraView in Android?

问题描述

我需要捕获图像从必需部分屏幕.

从相机捕获图像.

当时其他屏幕内容.

这如何可能?

推荐答案

尝试使用Surface View来创建动态 相机视图和设置在您需要的部分.

try to use Surface View for creating dynamic camera view and set in your required portion.

以下代码试试

变量设置类级别(全局)

Button btn_capture;
Camera camera1;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
public static boolean previewing = false;

onCreate() 方法中的以下代码

getWindow().setFormat(PixelFormat.UNKNOWN);
    surfaceView = new SurfaceView(this);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btn_capture = (Button) findViewById(R.id.button1);

surfaceView.setBackgroundResource(R.drawable.your_background_image);

if(!previewing){

        camera1 = Camera.open();
        if (camera1 != null){
            try {
                camera1.setDisplayOrientation(90);
                camera1.setPreviewDisplay(surfaceHolder);
                camera1.startPreview();
                previewing = true;
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

btn_capture.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            if(camera != null)
            {
                camera1.takePicture(myShutterCallback, myPictureCallback_RAW, myPictureCallback_JPG);

            }
        }
    });

以下代码将放在您的类中的 onCreate() 之后.

Following code put after onCreate() in your class.

ShutterCallback myShutterCallback = new ShutterCallback(){

    public void onShutter() {
        // TODO Auto-generated method stub
    }};

PictureCallback myPictureCallback_RAW = new PictureCallback(){

    public void onPictureTaken(byte[] arg0, Camera arg1) {
        // TODO Auto-generated method stub
    }};

PictureCallback myPictureCallback_JPG = new PictureCallback(){

    public void onPictureTaken(byte[] arg0, Camera arg1) {
        // TODO Auto-generated method stub
        Bitmap bitmapPicture = BitmapFactory.decodeByteArray(arg0, 0, arg0.length);

        Bitmap correctBmp = Bitmap.createBitmap(bitmapPicture, 0, 0, bitmapPicture.getWidth(), bitmapPicture.getHeight(), null, true);

    }};

public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub
    if(previewing){
        camera1.stopPreview();
        previewing = false;
    }

    if (camera1 != null){
        try {
            camera1.setPreviewDisplay(surfaceHolder);
            camera1.startPreview();
            previewing = true;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

public void surfaceCreated(SurfaceHolder holder) {
    // TODO Auto-generated method stub

}

public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub

        camera1.stopPreview();
        camera1.release();
        camera1 = null;
        previewing = false;

}

在AndroidManifest.xml中给用户权限.

<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front" android:required="false"/>

并且也没有忘记(实现 SurfaceHolder.Callback )到类.

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