In Android, camera preview is called.

 

The steps for calling camera preview in Android are as follows:

1. surfaceview Problems

 
//Define objectPrivateSurfaceview photoview;//Surfaceview object: (view component) Video DisplayPrivateSurfaceholder photoholder;//Surfaceholder object: (abstract interface) surfaceview support ClassPrivateCamera camera;//Camera object, camera Preview
 

//Surfaceview object settingsPhotoholder = photoview. getholder ();//Bind surfaceview to obtain the surfaceholder object.Photoholder. settype (surfaceholder. surface_type_push_buffers );//Set the display typePhotoholder. setfixedsize (100,100); Photoholder. addcallback (Callback);//Surfaceholder joins callback Interface
 

2. Implement the surfaceholder. Callback Interface

Surfaceholder. Callback Callback = New Surfaceholder. Callback () {@ override  Public   Void  Surfacedestroyed (surfaceholder holder ){  //  Todo auto-generated method stub              Camera. setpreviewcallback (null); camera. stoppreview (); camera. Release (); camera = NULL  ;} @ Override  Public   Void  Surfacecreated (surfaceholder holder ){ //  Todo auto-generated method stub             Camera = camera. open (); try {Camera. setpreviewdisplay (photoholder);} catch (ioexception e) {// todo auto-generated Catch Block  E. printstacktrace ();}} @ Override  Public   Void Surfacechanged (surfaceholder holder, Int Format, Int  Width,  Int Height ){  //  Todo auto-generated method stub  Initcamera ();}}; 

3. settings of the camera attribute

//Set camera attributesPublic VoidInitcamera() {Camera. parameters=Camera. getparameters ();// Obtain the camera attributesCamera. setdisplayorientation (90);// Rotate 90 degrees (if not set, it will be displayed horizontally)Camera. setparameters (parameters );// Save the property value to the Camera Parameter}