如何解决根据纹理视图的大小自动调整大小的camera2预览
我正在为我的项目使用camera2 API。预览是在Google推荐的AutofitTextureView上设置的。
但是使用他们的代码,当textureview填满整个屏幕时,预览就被拉伸了。
因此,我找到了一个stackoverflow答案,并将代码编辑为此:
AutoFitTextureView.java:
package com.example.android.camera2basic;
import android.content.Context;
import android.util.AttributeSet;
import android.view.TextureView;
public class AutoFitTextureView extends TextureView {
private int mRatioWidth = 0;
private int mRatioHeight = 0;
public AutoFitTextureView(Context context) {
this(context,null);
}
public AutoFitTextureView(Context context,AttributeSet attrs) {
this(context,attrs,0);
}
public AutoFitTextureView(Context context,AttributeSet attrs,int defStyle) {
super(context,defStyle);
}
public void setAspectRatio(int width,int height) {
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Size cannot be negative.");
}
mRatioWidth = width;
mRatioHeight = height;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width,height);
} else {
#This is the line that I have changed:
if (width > height * mRatioWidth / mRatioHeight) {
setMeasuredDimension(width,width * mRatioHeight / mRatioWidth);
} else {
setMeasuredDimension(height * mRatioWidth / mRatioHeight,height);
}
}
}
}
使用上面的代码和此代码:
private static final int MAX_PREVIEW_WIDTH = 1920;
private static final int MAX_PREVIEW_HEIGHT = 1080;
private Size previewSize;
int displayRotation = getWindowManager().getDefaultDisplay().getRotation();
int mSensorOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
boolean swappedDimensions = false;
switch (displayRotation) {
case Surface.ROTATION_0:
case Surface.ROTATION_180:
if (mSensorOrientation == 90 || mSensorOrientation == 270) {
swappedDimensions = true;
}
break;
case Surface.ROTATION_90:
case Surface.ROTATION_270:
if (mSensorOrientation == 0 || mSensorOrientation == 180) {
swappedDimensions = true;
}
break;
default:
//Log.e(TAG,"Display rotation is invalid: " + displayRotation);
}
Point displaySize = new Point();
getWindowManager().getDefaultDisplay().getSize(displaySize);
int rotatedPreviewWidth = width;
int rotatedPreviewHeight = height;
int maxPreviewWidth = displaySize.x;
int maxPreviewHeight = displaySize.y;
if (swappedDimensions) {
rotatedPreviewWidth = height;
rotatedPreviewHeight = width;
maxPreviewWidth = displaySize.y;
maxPreviewHeight = displaySize.x;
}
if (maxPreviewWidth > MAX_PREVIEW_WIDTH) {
maxPreviewWidth = MAX_PREVIEW_WIDTH;
}
if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) {
maxPreviewHeight = MAX_PREVIEW_HEIGHT;
}
Size largest = Collections.max(Arrays.asList(map.getOutputSizes(SurfaceTexture.class)),new PrismaCamera.CompareSizesByArea());
previewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),rotatedPreviewWidth,rotatedPreviewHeight,maxPreviewWidth,maxPreviewHeight,largest);
public static Size chooseOptimalSize(Size[] choices,int textureViewWidth,int textureViewHeight,int maxWidth,int maxHeight,Size aspectRatio) {
// Collect the supported resolutions that are at least as big as the preview Surface
List<Size> bigEnough = new ArrayList<>();
// Collect the supported resolutions that are smaller than the preview Surface
List<Size> notBigEnough = new ArrayList<>();
int w = aspectRatio.getWidth();
int h = aspectRatio.getHeight();
for (Size option : choices) {
if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight &&
option.getHeight() == option.getWidth() * h / w) {
if (option.getWidth() >= textureViewWidth &&
option.getHeight() >= textureViewHeight) {
bigEnough.add(option);
} else {
notBigEnough.add(option);
}
}
}
// Pick the smallest of those big enough. If there is no one big enough,pick the
// largest of those not big enough.
if (bigEnough.size() > 0) {
return Collections.min(bigEnough,new CompareSizesByArea());
} else if (notBigEnough.size() > 0) {
return Collections.max(notBigEnough,new CompareSizesByArea());
} else {
Log.e(TAG,"Couldn't find any suitable preview size");
return choices[0];
}
}
我能够使相机预览全屏显示,而无需拉伸预览。但是问题在于,当TextureView的宽度和高度设置为match_parent以外的值时,相机预览仍会占据整个屏幕。
例如,此:
<com.camera.AutoFitTextureView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/textureView"
/>
这:
<com.camera.AutoFitTextureView
android:layout_width="500dp"
android:layout_height="500dp"
android:id="@+id/textureView"
/>
将预览设置为全屏。我想要的是,相机预览应该完全适合textureview的宽度和高度,而不会占用整个空间并填满屏幕。如何实现呢?摄像机预览应该在9:16、1:1、3:4和其他所有比例下都是完美的。
这可能吗?等待你的答复。问候。
更新: 这是我当前的布局文件:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="@android:color/black">
<TextureView
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/textureView"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:layout_marginTop="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
解决方法
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