我需要帮助。
我正在尝试开发一个简单的应用程序，它可以拍照（哇，这真是太原创了！）。一切都很好。我唯一需要的是一个圆形相机预览。
我的相机预览类（继承自surfaceview）放置在一个框架布局中，这基本上就是我的相机预览。如您所知，它呈矩形形状。由于我对该应用有更大的计划，我需要相机预览为圆形（例如，某人可以拍摄某人的面部照片，我可以在周围画一些图画......）。
现在，我不知道该怎么做。我尝试了不同的方法，创建了一个带有xml的形状，并将其设置为我的框架布局的背景，但那根本没用。
在花费了数小时在谷歌上寻找解决方案后，我决定放弃并来到这里。
因此，请如果有人知道任何内容，请告诉我们 :) 如果需要澄清，请不要犹豫问询。
简单方法：
1）不设置预览表面
2）捕捉原始数据
3）转换为位图并将其制作成圆形
4）显示（例如在ImageView上）
仅供参考：
public class CameraRoundPriview extends ImageView {
private Camera camera;
private Bitmap bitmap = null;
private int mPreviewWidth, mPreviewHeight;
boolean mCameraOn = false;
public CameraRoundPriview(Context context, AttributeSet attrs) {
super(context, attrs);
}
private Bitmap getclip() {
//clip
Bitmap output = Bitmap.createBitmap(bitmap.getHeight(),
bitmap.getHeight(),
Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getHeight(),
bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(bitmap.getHeight() / 2,
bitmap.getHeight() / 2,
bitmap.getHeight() / 2, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
//rotate
android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(getCameraID(), info);
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
int result = degrees;
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP){
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
}
Matrix matrix = new Matrix();
matrix.postRotate(result);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(output,output.getWidth(),output.getHeight(),true);
Bitmap rotatedBitmap = Bitmap.createBitmap(scaledBitmap , 0, 0, scaledBitmap.getWidth(), scaledBitmap .getHeight(), matrix, true);
return rotatedBitmap;
}
private void showImage(){
if ((bitmap != null)){
this.setImageBitmap(getclip());
}
}
public boolean onClickCamera(){
if (mCameraOn){
mCameraOn = false;
cameraStop();
}else{
mCameraOn = true;
cameraStart();
}
return mCameraOn;
}
private void cameraStop(){
if (camera == null) return;
camera.setPreviewCallback(null);
camera.release();
camera = null;
}
private int getCameraID(){
// specify camera id
return 0;
}
private void cameraStart(){
Camera camera = Camera.open(getCameraID());
final Camera.Size previewSize = camera.getParameters().getPreviewSize();
mPreviewWidth = previewSize.width;
mPreviewHeight = previewSize.height;
try {
camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera_call) {
ByteArrayOutputStream outstr = new ByteArrayOutputStream();
Rect rect = new Rect(0, 0, mPreviewWidth, mPreviewHeight);
YuvImage yuvimage=new YuvImage(data,ImageFormat.NV21,mPreviewWidth,mPreviewHeight,null);
yuvimage.compressToJpeg(rect, 50, outstr);
bitmap = BitmapFactory.decodeByteArray(outstr.toByteArray(), 0, outstr.size());
showImage();
camera_call.addCallbackBuffer(data);
}
});
} catch (Exception e) {}
camera.startPreview();
this.camera=camera;
}
}
ImageView。将SurfaceView和ImageView都放在一个FrameLayout中，两者都设置为match_parent，并且图像必须位于顶部。
将其设置为带有透明圆形的黑色图像。这很简单，如下所示：
这适用于CameraX或Camera2 API。
注意：您必须具有透明背景。
您必须拥有以下类似的XML文件。
<com.RoundedCameraPreview
android:id="@+id/viewFinder"
android:background="#00000000"
app:scaleType="fillCenter"
android:layout_width="match_parent"
android:layout_height="match_parent" />
还要别忘了在style.xml中声明
<declare-styleable name="PreviewView">
<attr name="isRound" format="boolean" />
</declare-styleable>
代码是这样编写的
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.camera.view.PreviewView;
public class RoundedCameraPreview extends PreviewView {
Path clipPath;
boolean isRound;
public RoundedCameraPreview(@NonNull Context context) {
super(context);
}
public RoundedCameraPreview(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public RoundedCameraPreview(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.PreviewView,
0, 0);
try {
isRound = a.getBoolean(R.styleable.PreviewView_isRound, true);
} finally {
a.recycle();
}
}
public boolean isRound() {
return isRound;
}
public void setIsRound(boolean isRound) {
this.isRound = isRound;
invalidate();
requestLayout();
}
public RoundedCameraPreview(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
protected void dispatchDraw(Canvas canvas) {
if (isRound) {
clipPath = new Path();
//TODO: define the circle you actually want
clipPath.addCircle(canvas.getWidth() / 2, canvas.getWidth() / 2, canvas.getWidth() / 2, Path.Direction.CW);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
canvas.clipPath(clipPath);
canvas.drawPath(clipPath, paint);
}
super.dispatchDraw(canvas);
}
}