android - 以编程方式设置android textView drawableEnd

Question

如何从java代码android:drawableEnd中设置？只能用于左侧、右侧、顶部和底部TextView。setCompoundDrawablesRelativeWithIntrinsicBounds(int,int,int,int)如何设置drawableEnd？

Answer 1

要以编程方式设置 drawableend，请使用以下代码。为我工作。

   rowTextView.setCompoundDrawablesRelativeWithIntrinsicBounds(0, 0, R.drawable.ic_call_black_24dp, 0);

Answer 2

有一个类似的方法叫做 setCompoundDrawablesRelativeWithIntrinsicBounds(int, int, int, int) 参数指的是 start, top, end, bottom

不过，您需要最低 API 级别 17或更高。

Answer 3

如果你使用 kotlin，我可以建议以下扩展 EditText 与 Drawables 交互。

var EditText.drawableStart: Drawable?
    get() = compoundDrawablesRelative?.get(0)
    set(value) = setDrawables(start = value)

var EditText.drawableTop: Drawable?
    get() = compoundDrawablesRelative?.get(1)
    set(value) = setDrawables(top = value)

var EditText.drawableEnd: Drawable?
    get() = compoundDrawablesRelative?.get(2)
    set(value) = setDrawables(end = value)

var EditText.drawableBottom: Drawable?
    get() = compoundDrawablesRelative?.get(2)
    set(value) = setDrawables(bottom = value)


fun EditText.setDrawables(
    start: Drawable? = null,
    top: Drawable? = null,
    end: Drawable? = null,
    bottom: Drawable? = null
) = setCompoundDrawablesRelativeWithIntrinsicBounds(start, top, end, bottom)

添加这些扩展后，您可以使用 Drawables，如下所示：

drawableEnd = context.getDrawable(R.drawable.ic_close_black)

我认为这里有必要使用方法'setCompoundDrawablesRelativeWithIntrinsicBounds'。因为在实现内部，它设置变量 mDrawableEnd 和 mDrawableStart 的值。这些变量在 left 和 rigt 中被替换，如果不为 null，则可以在 TextView 内的此类代码示例中看到：

if (mIsRtlCompatibilityMode) {
                // Use "start" drawable as "left" drawable if the "left" drawable was not defined
                if (mDrawableStart != null && mShowing[Drawables.LEFT] == null) {
                    mShowing[Drawables.LEFT] = mDrawableStart;
                    mDrawableSizeLeft = mDrawableSizeStart;
                    mDrawableHeightLeft = mDrawableHeightStart;
                }
                // Use "end" drawable as "right" drawable if the "right" drawable was not defined
                if (mDrawableEnd != null && mShowing[Drawables.RIGHT] == null) {
                    mShowing[Drawables.RIGHT] = mDrawableEnd;
                    mDrawableSizeRight = mDrawableSizeEnd;
                    mDrawableHeightRight = mDrawableHeightEnd;
                }
            }