关于Android摄像头操作设置的工具类
使用时打开摄像头的方法
/**
* 根据CameraTag 初始化前置或后置摄像头
*/
void openAndInitCamera(){
if(CameraTag>0) {
CameraUtil.getInstance().surfaceCreated(YourActivity.this,holder, CameraTag);
CameraUtil.getInstance().initCamera( context, this);
CameraUtil.getInstance().doChange(holder,this);
}
}
关闭摄像头的方法 引用的页面destroy时可调用
CameraUtil.getInstance().CloseCamera(holder,YourActivity.this);
以下是工具类部分
===================================================================================public class CameraUtil {
private static CameraUtil cameraUtil;
//320 240
private int camWidth = 320;
private int camHeight = 240;
private Camera.Parameters parameters;
private Camera mCamera;
public static synchronized CameraUtil getInstance(){
if(cameraUtil==null) cameraUtil=new CameraUtil();
return cameraUtil;
}
private int FindFrontCamera(){
int cameraCount = 0;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras(); // get cameras number
for ( int camIdx = 0; camIdx < cameraCount;camIdx++ ) {
Camera.getCameraInfo( camIdx, cameraInfo ); // get camerainfo
if ( cameraInfo.facing ==Camera.CameraInfo.CAMERA_FACING_FRONT ) {
// 代表摄像头的方位，目前有定义值两个分别为CAMERA_FACING_FRONT前置和CAMERA_FACING_BACK后置
return camIdx;
}
}
return -1;
}
private int FindBackCamera(){
int cameraCount = 0;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras(); // get cameras number
for ( int camIdx = 0; camIdx < cameraCount;camIdx++ ) {
Camera.getCameraInfo( camIdx, cameraInfo ); // get camerainfo
if ( cameraInfo.facing ==Camera.CameraInfo.CAMERA_FACING_BACK ) {
// 代表摄像头的方位，目前有定义值两个分别为CAMERA_FACING_FRONT前置和CAMERA_FACING_BACK后置
return camIdx;
}
}
return -1;
}
/**
*
* @param holder
* @param tag 1前置 2后置
*/
public void surfaceCreated(SurfaceHolder.Callback callback,SurfaceHolder holder,int tag) {
CloseCamera(holder,callback);
int CammeraIndex=-1;
Camera camera=null;
if(tag==1)
CammeraIndex=FindFrontCamera();
else if(tag==2){
CammeraIndex=FindBackCamera();
}
LogTools.i("CameraUtil"," surfaceCreated tag:"+tag+" CammeraIndex:"+CammeraIndex);
if(CammeraIndex!=-1) {
mCamera= Camera.open(CammeraIndex);
}
//return camera;
}
public void CloseCamera(SurfaceHolder holder,SurfaceHolder.Callback callback){
if(mCamera!=null) {
if(holder!=null&&callback!=null)
holder.removeCallback(callback);
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.lock();
mCamera.release();
mCamera=null;
}
LogTools.i("CameraUtil"," <
/**
* camera的预览
*/
public void initCamera(Context context,Camera.PreviewCallback cb) {
if(mCamera==null) return;
/**设置了一堆属性并给camera设置这些属性*/
parameters = mCamera.getParameters();
parameters.setFlashMode("off"); // 无闪光灯
parameters.setWhiteBalance(Camera.Parameters.WHITE_BALANCE_AUTO);
parameters.setSceneMode(Camera.Parameters.SCENE_MODE_AUTO);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
parameters.setPreviewFormat(ImageFormat.YV12);
parameters.setPictureSize(camWidth, camHeight);
parameters.setPreviewSize(camWidth, camHeight);
//这两个属性 如果这两个属性设置的和真实手机的不一样时，就会报错
mCamera.setParameters(parameters);
setOrientation(mCamera,context);
byte[] buf = new byte[camWidth * camHeight * 3 / 2];
mCamera.addCallbackBuffer(buf);
mCamera.setPreviewCallback(cb);
}
private void setOrientation(Camera mCamera, Context context) {
// 横竖屏镜头自动调整
if (context.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
parameters.set("orientation", "portrait"); //
parameters.set("rotation", 90); // 镜头角度转90度（默认摄像头是横拍）
mCamera.setDisplayOrientation(90); // 在2.2以上可以使用
} else {// 如果是横屏
parameters.set("orientation", "landscape"); //
mCamera.setDisplayOrientation(0); // 在2.2以上可以使用
}
}
//当我们的程序开始运行，即使我们没有开始录制视频，我们的surFaceView中也要显示当前摄像头显示的内容
public void doChange(SurfaceHolder holder,Activity context) {
if(mCamera==null) return;
try {
mCamera.setPreviewDisplay(holder);
//设置surfaceView旋转的角度，系统默认的录制是横向的画面，把这句话注释掉运行你就会发现这行代码的作用
mCamera.setDisplayOrientation(getDegree(context));
mCamera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
public int getDegree(Activity context) {
//获取当前屏幕旋转的角度
int rotating = context.getWindowManager().getDefaultDisplay().getRotation();
int degree = 0;
//根据手机旋转的角度，来设置surfaceView的显示的角度
switch (rotating) {
case Surface.ROTATION_0:
degree = 90;
break;
case Surface.ROTATION_90:
degree = 0;
break;
case Surface.ROTATION_180:
degree = 270;
break;
case Surface.ROTATION_270:
degree = 180;
break;
}
return degree;
}
}