Android Custom Camera Camera a black screen solution _android

This article illustrates the solution to the black screen of the Android custom camera camera. Share to everyone for your reference, specific as follows:

For some phones, like HTC, when customizing camera, call Camera.parameters's parameters.setpreviewsize (width, height) method when the width and height are odd, There will be a black screen phenomenon, the solution can refer to the SDK provided by the Apidemos in the camera example:

List<size> sizes = parameters.getsupportedpreviewsizes ();
Size optimalsize = getoptimalpreviewsize (sizes, W, h);
Parameters.setpreviewsize (Optimalsize.width, optimalsize.height);

At the same time, setting the Parameters.setpicturesize (Width,height) attribute on the HTC phone also results in a black screen and no problem on the Samsung phone. And if you set the Setpreviewsize properties of the wide-height error, the photos will also be distorted and other bugs, so when the adaptation problem, the best way is not to set the Previewsize and Picturesize properties .

Getoptimalpreviewsize method

 private Size getoptimalpreviewsize (list<size> sizes, int w, int h) {Final double
 Aspect_tolerance = 0.05;
 Double targetratio = (double) w/h;
 if (sizes = null) return null;
 Size optimalsize = null;
 Double Mindiff = Double.max_value;
 int targetheight = h; Try to find a size match aspect ratio and size for (size size:sizes) {Double ratio = (double) size.width/size.h
 eight;
 if (Math.Abs (ratio-targetratio) > Aspect_tolerance) continue;
 if (Math.Abs (size.height-targetheight) < Mindiff) {optimalsize = size;
 Mindiff = Math.Abs (size.height-targetheight); }//Cannot find the one match the aspect ratio, ignore the requirement if (optimalsize = null) {Mindiff = Double.
 Max_value;
  for (size size:sizes) {if (Math.Abs (size.height-targetheight) < Mindiff) {optimalsize = size;
 Mindiff = Math.Abs (size.height-targetheight);
}} return optimalsize; }

For more information on Android-related content readers can view the site: "The Android photo and photo processing skills summary", "Android Development introduction and Advanced Course", "Android Multimedia operating skills Summary (audio, video, recording, etc.)", " Android Basic Components Usage Summary, Android View tips Summary, Android layout layout tips and Android Control usage summary

I hope this article will help you with the Android program.