我们知道自定义Camera需要以下几步
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1、打开相机
public static Camera openFacingBackCamera() {
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
//打开相应的摄像头，目前是前置摄像头
cam = Camera.open(camIdx);
} catch (RuntimeException e) {
e.printStackTrace();
if (cam!=null){
cam.stopPreview();
cam.release();
}
cam = null;
}
}
}
return cam;
}
2、设置相关参数和预览
//定义SurfaceView
private SurfaceView localSurface;
// 为surfaceHolder添加一个回调监听器
localSurface.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
camera = CameraUtil.openFacingBackCamera();
//设置相机预览旋转角度
camera.setDisplayOrientation(180);
if (camera != null) {
Camera.Parameters parameters = camera.getParameters();// 获得相机参数
List sizes = parameters.getSupportedPreviewSizes();
List sizes_pic = parameters.getSupportedPictureSizes();
Camera.Size cs = sizes.get(0);
int mWidth = cs.width;
int mHeight = cs.height;
parameters.setPreviewSize(mWidth, mHeight);
parameters.setPictureSize(sizes_pic.get(0).width, sizes_pic.get(0).height);
parameters.setJpegQuality(85);//
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
parameters.setPictureFormat(ImageFormat.JPEG);
camera.setParameters(parameters);
try {
camera.setPreviewDisplay(localSurface.getHolder());
camera.startPreview(); // 开始预览
camera.autoFocus(null); // 自动对焦
} catch (IOException e) {
e.printStackTrace();
camera.stopPreview();
camera.release();
camera = null;
}
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera!=null){
camera.stopPreview();
camera.release();
camera = null;
}
}
} );
// 设置该SurfaceView自己不维护缓冲
localSurface.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
3、获取图片
private void getViewImage() {
//设置监听
camera.setPreviewCallback(new Camera.PreviewCallback(){
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Size size = camera.getParameters().getPreviewSize();
try{
YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
if(image!=null){
ByteArrayOutputStream stream = new ByteArrayOutputStream();
image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream);
Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size());
//因为图片会放生旋转，因此要对图片进行旋转到和手机在一个方向上
rotateBitmap(bmp);
stream.close();
}
}catch(Exception ex){
Log.e("Sys","Error:"+ex.getMessage());
}
}
});
}
旋转图片的方法
public void rotateMyBitmap(Bitmap bmp){
Matrix matrix = new Matrix();
matrix.postScale(-1, 1); // 镜像水平翻转(如果左右颠倒)
matrix.postRotate(180);
Bitmap nbmp = Bitmap.createBitmap(bmp, 0,0, bmp.getWidth(), bmp.getHeight(), matrix, true);
imageView.setImageBitmap(nbmp);
};
自定义时间拍照
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case 101:
getViewImage();
Log.e(TAG, "handleMessage: 拍照" );
mHandler.sendEmptyMessageDelayed(102, 100);
break;
case 102:
camera.setPreviewCallback(null);
break ;
}
}
};然后点击按钮调用
mHandler.sendEmptyMessageDelayed(101, 100);
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
