Android相机多个预览流,Android开启相机预览获取Yuv视频流数据

自定义surfaceview

主要步骤：

实现surfaceholder.callback接口，创建surfaceview的生命周期

实现camera.previewcallback接口，创建预览回调接口

创建camera打开相机

实例：

public class camerasurfaceviews extends surfaceview implements surfaceholder.callback, camera.previewcallback{

context mcontext;

surfaceholder msurfaceholder;//surface的控制器

camera mcamera;//相机类

framecallback mcb;//数据回调接口

public void setmcb(framecallback mcb) {

this.mcb = mcb;

}

//获取surfaceview的surfaceholder对象和接口

public camerasurfaceviews(context context, attributeset attrs) {

super(context, attrs);

mcontext = context;

msurfaceholder = getholder();

msurfaceholder.addcallback(this);

}

//寻找相机

private int findcamera(boolean isfront) {

int cameracount = 0;

camera.camerainfo camerainfo = new camera.camerainfo();

cameracount = camera.getnumberofcameras();

for (int camidx = 0; camidx < cameracount; camidx++) {

camera.getcamerainfo(camidx, camerainfo);

if (isfront) {

// camera_facing_front前置

if (camerainfo.facing == camera.camerainfo.camera_facing_front) {

return camidx;

}

} else {

// camera_facing_back后置

if (camerainfo.facing == camera.camerainfo.camera_facing_back) {

return camidx;

}

}

}

return -1;

}

//打开相机

private camera getcamera() {

camera camera = null;

int cameraid = findcamera(false);

try {

if(cameraid==1){

camera = camera.open(cameraid );

}else if(cameraid==0)(

camera = camera.open(0);

}

} catch (exception e) {

camera = null;

}

return camera;

}

//surface被创建时调用

@override

public void surfacecreated(surfaceholder holder) {

mcamera = getcamera();

}

//surface大小被改变时调用

@override

public void surfacechanged(surfaceholder holder, int format, int width,int height) {

setstartpreview(mcamera,msurfaceholder);

}

//surface被销毁时调用

@override

public void surfacedestroyed(surfaceholder holder) {

releasecamera();

}

//开启相机预览

private void setstartpreview(camera camera, surfaceholder holder) {

try {

mcamera.setpreviewdisplay(holder);

mcamera.setpreviewcallback(this);

camera.startpreview();

} catch (ioexception e) {

}

}

//释放camera

public void releasecamera() {

if (mcamera != null) {

mcamera.setpreviewcallback(null);

mcamera.stoppreview();// 停掉摄像头的预览

mcamera.release();

mcamera = null;

}

}

//预览回调，传递yuv视频流数据

@override

public void onpreviewframe(byte[] bytes, camera camera) {

// log.i("onpreviewframe",""+ bytes);

if(mcb!= null){

mcb.ondecodeframe(bytes);

}

}

}

framecallback回调接口

public interface framecallback {

void ondecodeframe(byte[] data) ;

}

mainactivity

public class mainactivity extends appcompatactivity implements framecallback{

@override

protected void oncreate(bundle savedinstancestate) {

super.oncreate(savedinstancestate);

setcontentview(r.layout.activity_main);

}

@override

public void ondecodeframe(byte[] data) {

//实时处理yuv视频流数据

}

}

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