如何在文本视图的左上角设置可绘制对象？

Question

<TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawablePadding="@dimen/padding_small_6"
        android:includeFontPadding="false"
        android:text="@string/forgot_password_hint"
        android:drawableStart="@drawable/ic_edit"
        android:textSize="@dimen/text_size_medium_14"/>

这是我的文本视图。我想将可绘制对象设置在此文本视图的左侧。但问题是，如果文本是多行的，则可绘制对象在文本视图中显示为中心垂直。

是否有任何选项可以在文本视图的左上角设置可绘制对象？

Answer 1

通过扩展可绘制类来创建自定义可绘制类并用于可绘制.例如：

public class TopLeftGravityDrawable extends BitmapDrawable {
   private final Drawable mDrawable;

   public TopLeftGravityDrawable(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();
   }
}

用法 ：

       Drawable drawable = getResources().getDrawable(R.drawable.ic_customer);

       TopGravityDrawable gravityDrawable = new TopGravityDrawable(drawable);

       drawable.setBounds(0, 6, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
       gravityDrawable.setBounds(0, 6, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
       textview.setCompoundDrawables(gravityDrawable, null, null, null);