你好,我是这种
Android Studio Error的新手.可能只是一个警告,但我一直面临着找不到课程的问题.
实际上我正在开发Android Camera API应用程序,问题是我的Front Facing Camera Preview是Stretch.它只发生在华为p8 lite等2-3个设备上.当切换到前置摄像头时,设备会拉伸摄像头预览！
我有相机预览类：
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
//Variables de' Preview
private SurfaceHolder mHolder;
private List<Camera.Size> mSupportedPreviewSizes;
private Camera.Size mPreviewSize;
private int FOCUS_AREA_SIZE=300;
public static Camera previewCamera;
////////////////////////
//protected LOGGER keys
protected final String EXCEPTION_KEY="xception";
//////////////////////////
public CameraPreview(Context context,Camera camera) {
super(context);
//get the camera
previewCamera = camera;
if(previewCamera!=null){
// supported preview sizes
mSupportedPreviewSizes = previewCamera.getParameters().getSupportedPreviewSizes();
}
else{
previewCamera=camera;
// supported preview sizes
mSupportedPreviewSizes = previewCamera.getParameters().getSupportedPreviewSizes();
}
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting,but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
setKeepScreenOn(true);
setPreview();
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
try{
//when the surface is created,we can set the camera to draw images in this surfaceholder
setPreview();
previewCamera.setPreviewdisplay(surfaceHolder);
previewCamera.startPreview();
if(CameraActivity.cameraId==1){
previewCamera.setFaceDetectionListener(faceDetectionListener);
previewCamera.startFaceDetection();
}
} catch(Exception exp){
Log.i(EXCEPTION_KEY,"FROM surfaceCreated: "+exp.toString());
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder,int i,int i2,int i3) {
//before changing the application orientation,you need to stop the preview,rotate and then start it again
if(mHolder.getSurface() == null)//check if the surface is ready to receive camera data
return;
try{
previewCamera.stopPreview();
} catch (Exception e){
//this will happen when you are trying the camera if it's not running
}
//Now,recreate the camera preview
try{
//set the camera preview on every preview change
setPreview();
//in case the preview is still stretched bingo! Then...
// Camera.Parameters params = previewCamera.getParameters();
// List<Camera.Size> sizes = params.getSupportedPreviewSizes();
// Camera.Size optimalSize = PreviewSizeParameters.getoptimalPreviewSize(sizes,i2,i3);
// params.setPreviewSize(optimalSize.width,optimalSize.height);
// previewCamera.setParameters(params);
previewCamera.setPreviewdisplay(mHolder);
previewCamera.startPreview();
if(CameraActivity.cameraId==1){
previewCamera.setFaceDetectionListener(faceDetectionListener);
previewCamera.startFaceDetection();
}
} catch(Exception exp){
Log.i(EXCEPTION_KEY,"FROM surfaceChanged: "+exp.toString());
}
}
public void setPreview(){
try{
//set the focusable true
this.setFocusable(true);
//set the touch able true
this.setFocusableInTouchMode(true);
//set the camera display orientation lock
previewCamera.setdisplayOrientation(90);
//get the camera parameters
Camera.Parameters parameters = previewCamera.getParameters();
//set the preview size
parameters.setPreviewSize(mPreviewSize.width,mPreviewSize.height);
//set the parameter
previewCamera.setParameters(parameters);
}catch(Exception exp){
Log.i(EXCEPTION_KEY,"FROM setPreview: "+exp.toString());
}
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
//our app has only one screen,so we'll destroy the camera in the surface
//if you are using with more screens,please move this code your activity
try{
//handle in Activity onResume and onPause
}catch(Exception exp){
Log.i(EXCEPTION_KEY,"FROM surfaceDestroyed: "+exp.toString());
}
}
//Override Methods here
@Override
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) {
try{
final int width = resolveSize(getSuggestedMinimumWidth(),widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(),heightMeasureSpec);
setMeasuredDimension(width,height);
if (mSupportedPreviewSizes != null) {
mPreviewSize = PreviewSizeParameters.getoptimalPreviewSize(mSupportedPreviewSizes,width,height);
}
}catch(Exception exp){
Log.i(EXCEPTION_KEY,"FROM onMeasure: "+exp.toString());
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
private void stopPreviewAndFreeCamera() {
if (previewCamera != null) {
// Call stopPreview() to stop updating the preview surface.
previewCamera.stopPreview();
// Important: Call release() to release the camera for use by other
// applications. Applications should release the camera immediately
// during onPause() and re-open() it during onResume()).
previewCamera.release();
previewCamera = null;
}
}
//end of outer class here
}
自从过去几天以来,我一直在解决这个问题,并在我的自定义相机预览中获得相同的拉伸效果.
所以我获得最佳预览尺寸的方法是：
public class PreviewSizeParameters { //protected LOGGER keys protected static final String EXCEPTION_KEY = "xception"; ////////////////////////// public static Camera.Size getoptimalPreviewSize(List<Camera.Size> sizes,int w,int h) { final double ASPECT_TOLERANCE = 0.1; double targetRatio = (double) h / w; if (sizes == null) return null; Camera.Size optimalSize = null; double minDiff = Double.MAX_VALUE; int targetHeight = h; for (Camera.Size size : sizes) { double ratio = (double) size.width / size.height; if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue; if (Math.abs(size.height - targetHeight) < minDiff) { optimalSize = size; minDiff = Math.abs(size.height - targetHeight); } } if (optimalSize == null) { minDiff = Double.MAX_VALUE; for (Camera.Size size : sizes) { if (Math.abs(size.height - targetHeight) < minDiff) { optimalSize = size; minDiff = Math.abs(size.height - targetHeight); } } } return optimalSize; } }
问题
问题是只在前置摄像头上拉伸摄像头预览.我的日志cat数据如下：
它显示了一些行开头：I / art：找不到类：因为我是新手,所以我不知道它们是什么意思？
解决方法
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