Android Audio and video Development (iv): Capturing video data using the Camera API

This article is mainly about: using the camera API to capture video data and save to a file, using Surfaceview, Textureview to preview the Camera data, take the NV21 data callback.

Note: Requires permission:<uses-permission android:name= "Android.permission.CAMERA"/>

First, preview the Camera data

People who have done Android development generally know that there are two ways to do this: Surfaceview, Textureview.

Here's how to preview your data using Surfaceview:

 Surfaceview Surfaceview; 
 Camera camera;    
 
 @Override 
 protected void onCreate (Bundle savedinstancestate) {
 Super.oncreate (savedinstancestate); 
 Setcontentview (R.layout.activity_main);    
 
 Surfaceview = (surfaceview) Findviewbyid (R.id.surface_view); 
 Surfaceview.getholder (). Addcallback (this);    
 
//Turn on the camera and rotate the display direction by 90 degrees 
 Camera = Camera.open (); 
 Camera.setdisplayorientation (90); 
 
} 
 
//------Surface preview-------
 @Override 
 public void surfacecreated (Surfaceholder surfaceholder)        {
 try {
 Camera.setpreviewdisplay (surfaceholder); 
 Camera.startpreview ();    
} catch (IOException e) {
 E.printstacktrace (); 
 } 
} 
 
 
 @Override 
 public void surfacechanged (surfaceholder surfaceholder, int format, int w, int h) {
 br>} 
 
 @Override 
 public void surfacedestroyed (Surfaceholder surfaceholder) {
 Camera.release (); 
} 

Here's how to preview your data using Textureview:

Textureview Textureview;    Camera camera; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate); Setcontentview (r.layout.activity_main);Textureview=(Textureview) Findviewbyid (R.id.texture_view); Textureview.setsurfacetexturelistener ( This);//turn on the camera and rotate the display direction 90 degreesCamera =Camera.open (); Camera.setdisplayorientation (90); }
//------Texture Preview-------@Override Public voidOnsurfacetextureavailable (Surfacetexture surfacetexture,intIintI1) {        Try{camera.setpreviewtexture (surfacetexture);        Camera.startpreview (); } Catch(IOException e) {e.printstacktrace (); }} @Override Public voidOnsurfacetexturesizechanged (Surfacetexture surfacetexture,intIintI1) {} @Override Public Booleanonsurfacetexturedestroyed (surfacetexture surfacetexture) {camera.release (); return false; } @Override Public voidonsurfacetextureupdated (Surfacetexture surfacetexture) {}

Android Audio and video Development (iv): Capturing video data using the Camera API