Question

我必须动态更改listView的分隔颜色。

溶液：
因此，我以编程方式创建一个Drawable绘制一条水平线并将其设置为我的convertView的背景。现在该行位于我的convertView中间。如何将其与底部对齐？

public class DividerView extends Drawable {
private Paint mPaint;

public DividerView() {
    mPaint = new Paint();
    mPaint.setStrokeWidth(3);
}

@Override
public void draw(Canvas canvas) {
    int lvl = getLevel();
    Rect b = getBounds();
    float x = b.width() * lvl / 10000.0f;
    float y = (b.height() - mPaint.getStrokeWidth()) / 2;
    mPaint.setColor(Color.BLACK);
    canvas.drawLine(x, y, b.width(), y, mPaint);
}

@Override
protected boolean onLevelChange(int level) {
    invalidateSelf();
    return true;
}

@Override
public void setAlpha(int alpha) {
}

@Override
public void setColorFilter(ColorFilter cf) {
}

@Override
public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
}
}

溶液：
我还尝试使用可绘制的形状作为分隔线并改变其颜色。但我得到以下例外：
```
LayerDrawable cannot be cast to android.graphics.drawable.GradientDrawable
```

如何在图层列表中访问笔划？
这是我的代码：

divider.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

<item>
    <shape android:shape="rectangle" >
        <solid android:color="@android:color/transparent" />
    </shape>
</item>

<item android:top="-6dp" android:right="-6dp" android:left="-6dp">
    <shape>
        <solid android:color="@android:color/transparent" />
        <stroke
            android:width="1dp"
            android:color="#000000" />
    </shape>
</item>

ListAdapter.java

GradientDrawable drawable = (GradientDrawable)convertView.getBackground();
                    drawable.setStroke(3, Color.RED);
                    convertView.setBackground(drawable);

以编程方式在drawable底部绘制水平线

0 个答案: