我在我的應用程序中使用目標sdk 22構建自定義相機。我已經通過我的應用程序在包括三星S5,三星Note 4和華爲登臺隊友7和圖像預覽很好。Android三星Galaxy S4自定義相機預覽失真
但是,當我通過我的應用程序在三星Galaxy S4(Android 5.0.1)打開相機,我得到相機預覽失真。以下是預覽的圖像:
我看到的計算器很多帖子,但他們對我的問題,拍攝圖像後,是拍攝照片前。
以下是我使用的預覽代碼:
surfaceChanged方法
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { try { holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); Camera.Parameters parameters = camera.getParameters(); try { List<Camera.Size> supportedSizes = null; supportedSizes = Compatibility.getSupportedPreviewSizes(parameters); //preview form factor float ff = (float)w/h; Log.d("", "Screen res: w:"+ w + " h:" + h + " aspect ratio:" + ff); //holder for the best form factor and size float bff = 0; int bestw = 0; int besth = 0; Iterator<Camera.Size> itr = supportedSizes.iterator(); while(itr.hasNext()) { Camera.Size element = itr.next(); //current form factor float cff = (float)element.width/element.height; Log.d("Camera", "Candidate camera element: w:"+ element.width + " h:" + element.height + " aspect ratio:" + cff); int currentRes = element.width*element.height; //ff = Asp ratio of current Screen // cff = Asp ratio of current Size from Size list // bff = Asp ratio of current best aspect ratio selected if ((Math.abs(ff-cff) <= Math.abs(ff-bff))) { bff=cff; bestw = element.width; besth = element.height; } } Log.d("Camera", "Chosen camera element: w:"+ bestw + " h:" + besth + " aspect ratio:" + bff); if ((bestw == 0) || (besth == 0)){ Log.d("Camera", "Using default camera parameters!"); bestw = 480; besth = 320; Log.d("Camera","Using default camera parameters! aspect ratio "+480/320); } parameters.setPreviewSize(bestw, besth); //Handling camera angle switch(this.getWindowManager().getDefaultDisplay().getRotation()){ case 0: camera.setDisplayOrientation(90); break; case 1: camera.setDisplayOrientation(0); break; case 2: case 3: camera.setDisplayOrientation(180); break; } } catch (Exception ex) { parameters.setPreviewSize(480 , 320); } camera.setParameters(parameters); camera.startPreview(); } catch (Exception ex) { ex.printStackTrace(); } }
Compatibility.getSupportedPreviewSizes(參數)方法
@SuppressWarnings("unchecked") public static List<Camera.Size> getSupportedPreviewSizes(Camera.Parameters params) { List<Camera.Size> retList = null; try { Object retObj = mParameters_getSupportedPreviewSizes.invoke(params); if (retObj != null) { retList = (List<Camera.Size>)retObj; } } catch (InvocationTargetException ite) { /* unpack original exception when possible */ Throwable cause = ite.getCause(); if (cause instanceof RuntimeException) { throw (RuntimeException) cause; } else if (cause instanceof Error) { throw (Error) cause; } else { /* unexpected checked exception; wrap and re-throw */ throw new RuntimeException(ite); } } catch (IllegalAccessException ie) { //System.err.println("unexpected " + ie); } return retList; }
我將不勝感激任何形式的幫助。
在此先感謝。
你會選擇哪一個預覽大小? –
預覽尺寸爲480×320 – Sateesh
您的意思是,它回落到480x320,因爲沒有支持的尺寸不夠好?據我所知,問題在於S4不支持該決議。使用不支持的分辨率的結果是不可預知的。 –