getDrawable(int)在API 21(5.0)已经过时了
5.0之后使用:
ContextCompat.getDrawable(context, R.drawable.your_drawable)
例如:
imageView.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon));
源码
public static final Drawable getDrawable(Context context, int id) {
final int version = Build.VERSION.SDK_INT;
if (version >= 21) {
return ContextCompatApi21.getDrawable(context, id);
} else if (version >= 16) {
return context.getResources().getDrawable(id);
} else {
// Prior to JELLY_BEAN, Resources.getDrawable() would not correctly
// retrieve the final configuration density when the resource ID
// is a reference another Drawable resource. As a workaround, try
// to resolve the drawable reference manually.
final int resolvedId;
synchronized (sLock) {
if (sTempValue == null) {
sTempValue = new TypedValue();
}
context.getResources().getValue(id, sTempValue, true);
resolvedId = sTempValue.resourceId;
}
return context.getResources().getDrawable(resolvedId);
}
}
可以看出也是做了高版本低版本兼容的