在previewFrame数据图像的ImageView [英] OnPreviewFrame data image to imageView

问题描述

我想要获得相机的preVIEW字节[]，将其转换为位图，并与imageView.setImageBitmap（）

i'm trying to get the byte[] from the preview of the camera, convert it to bitmap and display it on a imageview with imageView.setImageBitmap()

我已经成功地启动preVIEW并在surfaceView显示它，但我不知道如何在RGB位字节[]数据（即进来YUV格式我认为）转换成显示它在一个ImageView的。

i've managed to start the preview and display it on a surfaceView, but i don't know how to convert the byte[] data (that comes in Yuv format i think) in a RGB bitmap to display it on a imageView.

在code我试图为以下内容：

the code i'm trying is the following:

camera = camera.open();
parameters = camera.getParameters();
camera.setParameters(parameters);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
camera.setPreviewDisplay(surfaceHolder);
camera.setPreviewCallback(this);
camera.startPreview();

和preVIEW回调是这样

and the preview callback is this

@Override
public void onPreviewFrame(byte[] data, Camera camera) {

    Camera.Parameters parameters = camera.getParameters();
    int width = parameters.getPreviewSize().width;
    int height = parameters.getPreviewSize().height;
    ByteArrayOutputStream outstr = new ByteArrayOutputStream();
    Rect rect = new Rect(0, 0, width, height); 
    YuvImage yuvimage=new YuvImage(data,ImageFormat.NV21,width,height,null);
    yuvimage.compressToJpeg(rect, 100, outstr);
    Bitmap bmp = BitmapFactory.decodeByteArray(outstr.toByteArray(), 0, outstr.size());
    imgView1.setImageBitmap(bmp);        
}

在preVIEW的作品，但仍然ImageView的空

The preview works but the imageView remains empty

任何想法？

推荐答案

有可能你没有在UI线程中打开摄像头。但是，你需要确保setImageBitmap被称为UI线程：

It is possible you did not open the Camera in the UI thread. However, you need to ensure setImageBitmap is called in the UI thread:

@Override
public void onPreviewFrame(final byte[] data, Camera camera) {
    Camera.Parameters parameters = camera.getParameters();
    int width = parameters.getPreviewSize().width;
    int height = parameters.getPreviewSize().height;

    YuvImage yuv = new YuvImage(data, parameters.getPreviewFormat(), width, height, null);

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    yuv.compressToJpeg(new Rect(0, 0, width, height), 50, out);

    byte[] bytes = out.toByteArray();
    final Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    MyActivity.this.runOnUiThread(new Runnable() {

        @Override
        public void run() {
            ((ImageView) findViewById(R.id.loopback)).setImageBitmap(bitmap);
        }
    });
}

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