我/艺术：不能找到类： [英] I/art: Can not find class:
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问题描述
你好，我是新的这种类型的Android Studio错误。可能是它只是一个警告，但我一直面临一个问题，不能找到类。
Hello there I am new to such kind of Android Studio Error. May be its just a warning but I have been facing an issue of not finding the classes.
在Android Camera API应用程序，问题是，我的前面相机预览是伸展。它只会发生在2-3个设备，如 Huawei p8 lite 。
Actually I'm working on an Android Camera API Application and the problem is that my Front Facing Camera Preview is Stretch. It only happens with some 2-3 devices like Huawei p8 lite. The device stretches its camera preview when switched to front facing camera!
我的相机预览类为：
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
}
自从最近几天以来，我一直在处理这个问题，并对我的自定义相机预览产生同样的拉伸效果。
I have been tackling with this issue since last few days and getting the same stretched effect on my custom camera preview.
所以我的最佳预览大小的方法是：
So my method for getting optimal preview sizes is:
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
问题是仅在前置相机上拉伸相机预览。我的日志猫数据如下：
The problem
The problem is of stretching camera preview on just front facing camera. My log cat data is as follow:
它显示了一些开头的行： I / art：找不到类：。因为我是新手，所以我不知道他们是什么意思？
It is showing some lines starting as: I/art: Can not find class:. As I am a newbiew so I have no idea what do they mean?
推荐答案
确保您已将以下依赖项添加到您的应用 build.gradle 文件。
Make sure you have the following dependencies added to your apps build.gradle file.
compile 'com.android.support:appcompat-v7:24.1.1'
compile 'com.android.support:recyclerview-v7:24.1.1'
在截图中，这些缺少的类位于recyclerview支持库（DefaultItemAnimator和SimpleItemAnimator）中。
From the screenshot, those missing classes are found in the recyclerview support library (DefaultItemAnimator and SimpleItemAnimator).
这篇关于我/艺术：不能找到类：的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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