Android ProgressBar setProgressDrawable 設置無效問題

ProgressBar的背景設置xml時可以使用，但代碼setProgressDrawable設置則無效。
layer-list如下：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+android:id/background"
        android:drawable="@drawable/icon_love">
    </item>
    <item
        android:id="@+android:id/secondaryProgress"
        android:drawable="@drawable/icon_love">
    </item>
    <item
        android:id="@+android:id/progress"
        android:drawable="@drawable/icon_love">
    </item>

</layer-list>

在代碼設置無效：

ProgressBar.setProgressDrawable(getResources().getDrawable(R.drawable.ratingbar_drawable_heart));

查看源碼發現：

    public void setProgressDrawable(Drawable d) {
        boolean needUpdate;
        if (mProgressDrawable != null && d != mProgressDrawable) {
            mProgressDrawable.setCallback(null);
            needUpdate = true;
        } else {
            needUpdate = false;
        }

        if (d != null) {
            d.setCallback(this);

            // Make sure the ProgressBar is always tall enough
            int drawableHeight = d.getMinimumHeight();
            if (mMaxHeight < drawableHeight) {
                mMaxHeight = drawableHeight;
                requestLayout();
            }
        }
        mProgressDrawable = d;
            ...

導致相當於換了背景一樣（本來有三顆星的）：

再發現sdk版本21有setProgressDrawableTiled方法可以解決，最版本怎麼處理？原來setProgressDrawableTiled有個方法tileify：

    public void setProgressDrawableTiled(Drawable d) {
        if (d != null) {
            d = tileify(d, false);
        }

        setProgressDrawable(d);
    }

是否底版本也有，看了一下14版本的sdk，也有這個私有方法！

    private Drawable tileify(Drawable drawable, boolean clip) {

        if (drawable instanceof LayerDrawable) {
            LayerDrawable background = (LayerDrawable) drawable;
            final int N = background.getNumberOfLayers();
            Drawable[] outDrawables = new Drawable[N];

            for (int i = 0; i < N; i++) {
                int id = background.getId(i);
                outDrawables[i] = tileify(background.getDrawable(i),
                        (id == R.id.progress || id == R.id.secondaryProgress));
            }

            LayerDrawable newBg = new LayerDrawable(outDrawables);

            for (int i = 0; i < N; i++) {
                newBg.setId(i, background.getId(i));
            }
            return newBg;
            ...

那解決方法可想而知，用java反射調用此方法：

    @SuppressLint("NewApi")
    public static void setProgressDrawable(@NonNull ProgressBar bar, @DrawableRes int resId) {
        Drawable layerDrawable = bar.getResources().getDrawable(resId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            Drawable d = getMethod("tileify", bar, new Object[] { layerDrawable, false });
            bar.setProgressDrawable(d);
        } else {
            bar.setProgressDrawableTiled(layerDrawable);
        }
    }

    private static Drawable getMethod(String methodName, Object o, Object[] paras) {
        Drawable newDrawable = null;
        try {
            Class<?> c[] = new Class[2];
            c[0] = Drawable.class;
            c[1] = boolean.class;
            Method method = ProgressBar.class.getDeclaredMethod(methodName, c);
            method.setAccessible(true);
            newDrawable = (Drawable) method.invoke(o, paras);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return newDrawable;
    }