见
my answer here。
您可以通过创建包装您的Drawable的自定义Drawable，然后通过覆盖方法onDraw(Canvas)来操作您的自定义Drawable的绘图来将一个复合Drawable(或底部)对齐。
以下示例是最简单的示例。这将图像与顶部对齐，但您也可以通过在onDraw(Canvas)方法中实现所需的逻辑使其与TextView的底部，左侧或右侧对齐。您可能还需要在onDraw(Canvas)中构建边距，使您的设计实现像素完美。
样品用量：
GravityCompoundDrawable gravityDrawable = new GravityCompoundDrawable(innerDrawable);
// NOTE: next 2 lines are important!
innerDrawable.setBounds(0, 0, innerDrawable.getIntrinsicWidth(), innerDrawable.getIntrinsicHeight());
gravityDrawable.setBounds(0, 0, innerDrawable.getIntrinsicWidth(), innerDrawable.getIntrinsicHeight());
mTextView.setCompoundDrawables(gravityDrawable, null, null, null);
示例代码：
public class GravityCompoundDrawable extends Drawable {
// inner Drawable
private final Drawable mDrawable;
public GravityCompoundDrawable(Drawable drawable) {
mDrawable = drawable;
}
@Override
public int getIntrinsicWidth() {
return mDrawable.getIntrinsicWidth();
}
@Override
public int getIntrinsicHeight() {
return mDrawable.getIntrinsicHeight();
}
@Override
public void draw(Canvas canvas) {
int halfCanvas= canvas.getHeight() / 2;
int halfDrawable = mDrawable.getIntrinsicHeight() / 2;
// align to top
canvas.save();
canvas.translate(0, -halfCanvas + halfDrawable);
mDrawable.draw(canvas);
canvas.restore();
}
}
