Question

我目前正在使用Camera2 API制作一个Android应用。我遇到AutoFitTextureView问题，图像显示拉长。我对AutoFitTextureView的代码如下

public class AutoFitTextureView extends TextureView {
private int mRatioWidth = 0;
private int mRatioHeight = 0;
private boolean mWithMargin = false;
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, attrs, 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 {
        if (width < height * mRatioWidth / mRatioHeight) {
            setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
        } else {
            setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
        }
    }
}

XML代码-

拉伸后的图像：

我正在使用的XML代码如下所示，即将拉伸-

 <com.qopius.AutoFitTextureViewNew
        android:id="@+id/texture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
         />

Answer 1

尝试此代码

@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 {
            if (width < height * mRatioWidth / mRatioHeight) {
            if (width > height * mRatioWidth / mRatioHeight) {
                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
            } else {
                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
}
}

Answer 2

尝试这个

@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 {
        if (width > height * mRatioWidth / mRatioHeight) {
            setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
        } else {
            setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
        }
    }
}

Answer 3

您需要将AutoFitTextureView放置在父视图/容器中，以允许其调整大小。如果父视图不允许这样做，则无论您在onMeasure中执行什么操作，它都会调整Textureview的大小。

例如，Camera2Basic示例将AutoFitTextureView放置在RelativeLayout中：

https://github.com/googlesamples/android-Camera2Basic/blob/master/Application/src/main/res/layout/fragment_camera2_basic.xml

Answer 4

1。）您的肖像分红和除数被错误地逆转了：

setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);

2。）AutoFitTextureView样本在onMeasure（..）中区分纹理方向的逻辑具有误导性：

if (width > height * mRatioWidth / mRatioHeight)

虽然它在4：3（仿真器，S2，S4）附近可正常工作，但在更大的宽高比（基本PH-1）下却无法工作。将纹理方向添加到setAspectRatio（..）方法可提供所需的信息。

注意：下面的示例忽略了180°和270°方向。

import android.util.AttributeSet;
class AutoFitTextureView extends TextureView {
    private int mRatioWidth = 0;
    private int mRatioHeight = 0;
    private int mTextureOrientation = 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, attrs, defStyle);
    }
    public void setAspectRatio(int width, int height, int textureOrientation) {
        if ( width < 0 || height < 0 ) {
            throw new IllegalArgumentException("Size cannot be negative.");
        }
        mRatioWidth = width;
        mRatioHeight = height;
        mTextureOrientation = textureOrientation;
        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 {
            if ( mTextureOrientation == 0 ) { // 0 == portrait, 1 == landscape
                setMeasuredDimension(width, width * mRatioWidth/mRatioHeight);
            } else {
                setMeasuredDimension(height * mRatioWidth/mRatioHeight, height);
            }
        }
    }
}

相机2预览被拉伸

4 个答案: