【问题标题】:Height of the item view gets reduced when i scroll on Recyclerview in android当我在 android 中的 Recyclerview 上滚动时,项目视图的高度会降低
【发布时间】:2020-11-06 12:28:40
【问题描述】:

我想显示名单。我正在使用 recyclerview 来显示。为此,我使用 Vertical TextView 作为项目视图。它可以正常工作。但问题是当我滚动 recyclerview 时,项目高度会降低

垂直文本视图类

public class VerticalTextView extends androidx.appcompat.widget.AppCompatTextView {
    boolean topDown;

    public boolean getTopDown(){
        return topDown;
    }
    public void setTopDown(boolean key){
        this.topDown=key;
    }

    public VerticalTextView(Context context, AttributeSet attrs){
        super(context, attrs);
        final int gravity = getGravity();

        if(Gravity.isVertical(gravity) && (gravity&Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {
            setGravity((gravity&Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);
            topDown = false;
        }else
            topDown = true;
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(getMeasuredHeight(),getMeasuredWidth());

    }

    @Override
    protected void onDraw(Canvas canvas) {
        TextPaint tp =getPaint();
        tp.setColor(getCurrentTextColor());
        tp.drawableState=getDrawableState();
        canvas.save();

        if(topDown){
            canvas.translate(getWidth(), 0);
            canvas.rotate(90);
        }else {
            canvas.translate(0, getHeight());
            canvas.rotate(-90);
        }

        canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());

        getLayout().draw(canvas);
        canvas.restore();



    }
}

这是我的项目布局

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:sayaki="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">


  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:visibility="visible"

      android:layout_marginVertical="5dp">


        <VerticalTextView
            android:id="@+id/tv_sub_category"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Sathyan"
            android:gravity="center"
            android:paddingVertical="1dp"
            android:maxLines="1"
            android:textSize="14sp"
            android:layout_marginVertical="10dp"
            android:textColor="@color/black"
            android:textStyle="bold"
        />


  </LinearLayout>

</layout>

但在滚动项目高度时会降低。

这是滚动之前的: 滚动后: 你可以看到最后 3 个项目的高度降低了,一些 c

【问题讨论】:

    标签: android android-recyclerview vertical-text


    【解决方案1】:

    我找到了我的问题的解决方案。我只是改变了我的垂直 TextView 类,如下所示

    public class NewVerticalView extends TextView {
        private Rect bounds = new Rect();
        private TextPaint textPaint;
        private int color;
    
        public NewVerticalView(Context context) {
            super(context);
        }
    
        public NewVerticalView(Context context, AttributeSet attrs) {
            super(context, attrs);
            color = getCurrentTextColor();
        }
    
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            textPaint = getPaint();
            textPaint.getTextBounds((String) getText(), 0, getText().length(), bounds);
            setMeasuredDimension((int) (bounds.height() + textPaint.descent()), bounds.width());
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            textPaint.setColor(color);
            canvas.rotate(-90,bounds.width(),0
            );
            canvas.drawText((String) getText(), 0,- bounds.width() + bounds.height(), textPaint);
        }
    }
    

    并在xml中添加旋转为180。现在我的问题解决了。

    【讨论】:

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