获取图像从SurfaceView到ImageView的？图像、SurfaceView、ImageView
我有获取图像/可绘制或从该工程作为摄像头preivew一个SurfaceView的位图的有点麻烦了。
最后CameraSurfaceView cameraSurfaceView =新CameraSurfaceView（本）;
的LinearLayout LL =（的LinearLayout）findViewById（R.id.linearLayout1）;
ll.addView（cameraSurfaceView）; //这个工程
ImageView的ivCam =（ImageView的）findViewById（R.id.ivCam）;
ivCam.setImageBitmap（cameraSurfaceView.getDrawingCache（））; //这并不:(
有什么建议？谢谢！
编辑：
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
最后CameraSurfaceView cameraSurfaceView =新CameraSurfaceView（本）;
的LinearLayout LL =（的LinearLayout）findViewById（R.id.LLS）;
ll.addView（cameraSurfaceView）; //这个工程
}
////////////////////////////////////////////////// /////////////////////////////////////////////
公共类CameraSurfaceView扩展了SurfaceView实现SurfaceHolder.Callback
{
私人SurfaceHolder持有人;
私人摄像头摄像头;
公共CameraSurfaceView（上下文的背景下）
{
超（上下文）;
//启动地面支架正确
this.holder = this.getHolder（）;
this.holder.addCallback（本）;
this.holder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;
}
@覆盖
公共无效surfaceCreated（SurfaceHolder持有人）
{
尝试
{
this.camera = Camera.open（）;
this.camera.set previewDisplay（this.holder）;
this.camera.set previewCallback（新previewCallback（）{
在previewFrame（byte []的_data，摄像机_camera）{公共无效
Camera.Parameters PARAMS = _camera.getParameters（）;
。INT W = params.get previewSize（）宽度;
。INT H = params.get previewSize（）高度;
INT格式= params.get previewFormat（）;
YuvImage形象=新YuvImage（_data，格式，W，H，NULL）;
ByteArrayOutputStream OUT =新ByteArrayOutputStream（）;
矩形面积=新的Rect（0，0，W，H）;
image.com pressToJpeg（区，50出）;
位图BM = BitmapFactory.de codeByteArray（out.toByteArray（），0，out.size（））;
ImageView的ivCam =（ImageView的）findViewById（R.id.imageView1）;
ivCam.setImageBitmap（BM）; ///零点EX这里！
}
}）;
}
赶上（IOException异常IOE）
{
ioe.printStackTrace（的System.out）;
}
}
@覆盖
公共无效surfaceChanged（SurfaceHolder持有人，INT格式，诠释的宽度，高度INT）
{
this.camera.start preVIEW（）;
}
@覆盖
公共无效surfaceDestroyed（SurfaceHolder持有人）
{
this.camera.stop preVIEW（）;
this.camera.release（）;
this.camera = NULL;
}
公共相机getCamera的（）
{
返回this.camera;
}
}
解决方案
这是远远比这更复杂。在SurfaceView的背景是不是相机preVIEW。你必须有一个类实现相机。previewCalback 。一旦你有，你可以得到一个包含了preVIEW发送图像的字节数组。在一些手机上，您可以设置preVIEW是一个JPEG在这种情况下，你可以去code它直接与BitmapFactory。在不支持该功能的其他手机，你会在默认情况下得到YUV 4：2：0的图像，你必须要转换为JPEG图像
在Android 2.2+，您可以将YUV图像转换为JPEG，像这样：
INT W = params.get previewSize（）宽度;
。INT H = params.get previewSize（）高度;
INT格式= params.get previewFormat（）;
YuvImage图象=新YuvImage（数据，格式，W，H，空）;
ByteArrayOutputStream OUT =新ByteArrayOutputStream（）;
矩形面积=新的Rect（0，0，W，H）;
image.com pressToJpeg（区，50出）;
位图BM = BitmapFactory.de codeByteArray（out.toByteArray（），0，out.size（））;
ivCam.setImageBitmap（BM）;
如果您定位老款车型，你必须使用一个转换算法喜欢这里的人。
的http://blog.tomgibara.com/post/132956174/yuv420-to-rgb565-conversion-in-android
一个SO来源：
获取来自视频图像帧的Android
编辑：
如果你想要的是显示摄像机视图，那么你只需要添加的 SurfaceView 您的相机正在使用像你在你的问题确实已经显示的布局。它已经显示出来。
I'm having a little trouble of getting an image/drawable or a bitmap from a SurfaceView that works as a camera preivew.
final CameraSurfaceView cameraSurfaceView = new CameraSurfaceView(this);
LinearLayout ll = (LinearLayout)findViewById(R.id.linearLayout1);
ll.addView(cameraSurfaceView); // THIS WORKS
ImageView ivCam = (ImageView) findViewById(R.id.ivCam);
ivCam.setImageBitmap(cameraSurfaceView.getDrawingCache()); // THIS DOESN'T :(
Any suggestions? Thanks!
EDIT:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final CameraSurfaceView cameraSurfaceView = new CameraSurfaceView(this);
LinearLayout ll = (LinearLayout)findViewById(R.id.LLS);
ll.addView(cameraSurfaceView); // THIS WORKS
}
///////////////////////////////////////////////////////////////////////////////////////////////
public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback
{
private SurfaceHolder holder;
private Camera camera;
public CameraSurfaceView(Context context)
{
super(context);
//Initiate the Surface Holder properly
this.holder = this.getHolder();
this.holder.addCallback(this);
this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceCreated(SurfaceHolder holder)
{
try
{
this.camera = Camera.open();
this.camera.setPreviewDisplay(this.holder);
this.camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] _data, Camera _camera) {
Camera.Parameters params = _camera.getParameters();
int w = params.getPreviewSize().width;
int h = params.getPreviewSize().height;
int format = params.getPreviewFormat();
YuvImage image = new YuvImage(_data, format, w, h, null);
ByteArrayOutputStream out = new ByteArrayOutputStream();
Rect area = new Rect(0, 0, w, h);
image.compressToJpeg(area, 50, out);
Bitmap bm = BitmapFactory.decodeByteArray(out.toByteArray(), 0, out.size());
ImageView ivCam = (ImageView) findViewById(R.id.imageView1);
ivCam.setImageBitmap(bm); /// NULL POINT EX HERE!
}
});
}
catch(IOException ioe)
{
ioe.printStackTrace(System.out);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
this.camera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
this.camera.stopPreview();
this.camera.release();
this.camera = null;
}
public Camera getCamera()
{
return this.camera;
}
}
解决方案
It's far more complicated than that. The background of the SurfaceView is not the camera preview. You have to have a class that implements Camera.PreviewCalback. Once you have that, you can get a byte array containing the image that the preview sends. On some phones, you can set the preview to be a JPEG in which case you can decode it straight with BitmapFactory. On other phones that don't support that feature, you'll get by default a YUV 4:2:0 image that you have to convert into a JPEG image.
On Android 2.2+, you can convert the YUV image to a JPEG like so:
int w = params.getPreviewSize().width;
int h = params.getPreviewSize().height;
int format = params.getPreviewFormat();
YuvImage image = new YuvImage(data, format, w, h, null);
ByteArrayOutputStream out = new ByteArrayOutputStream();
Rect area = new Rect(0, 0, w, h);
image.compressToJpeg(area, 50, out);
Bitmap bm = BitmapFactory.decodeByteArray(out.toByteArray(), 0, out.size());
ivCam.setImageBitmap(bm);
If you're targeting older models, you have to use a conversion algorithm like the one here.
http://blog.tomgibara.com/post/132956174/yuv420-to-rgb565-conversion-in-android
A SO source:
Getting frames from Video Image in Android
EDIT:
If all you want is to show the camera view, then you just add the SurfaceView that your camera is using to a layout that is already displayed like you did in your question. It's already displaying it.
