Skip to content

Instantly share code, notes, and snippets.

@ozodrukh
Created April 11, 2015 12:06
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save ozodrukh/609f32740ef5154ccdea to your computer and use it in GitHub Desktop.
Android Drawable loader alternative
package codetail.project.watchme.common.drawables;
import android.annotation.TargetApi;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.graphics.BitmapFactory;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v4.util.LongSparseArray;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;
import codetail.project.watchme.common.compat.Android;
public class DrawablesCompat {
private static final Object mAccessLock = new Object();
private static final Map<String, Class<? extends Drawable>> CLASS_MAP = new HashMap<>();
private static final LongSparseArray<WeakReference<Drawable.ConstantState>>
sDrawableCache = new LongSparseArray<>();
private static final LongSparseArray<WeakReference<Drawable.ConstantState>>
sColorDrawableCache = new LongSparseArray<>();
private static final IDrawable IMPL;
static {
registerDrawable(RippleDrawable.class, "ripple");
if(Android.isLollipop()){
IMPL = new LollipopDrawableImpl();
}else{
IMPL = new BaseDrawableImpl();
}
}
public static void registerDrawable(Class<? extends Drawable> clazz, String name) {
if (name == null || clazz == null) {
throw new NullPointerException("Class: " + clazz + ". Name: " + name);
}
CLASS_MAP.put(name, clazz);
}
public static void unregisterDrawable(String name) {
CLASS_MAP.remove(name);
}
/**
* Applies the specified theme to this Drawable and its children.
*/
public static void applyTheme(Drawable d, Resources.Theme t) {
IMPL.applyTheme(d, t);
}
public static boolean canApplyTheme(Drawable d) {
return IMPL.canApplyTheme(d);
}
/**
* Create a drawable from an inputstream
*/
public static Drawable createFromStream(InputStream is, String srcName) {
return createFromResourceStream(null, null, is, srcName);
}
/**
* Create a drawable from an inputstream, using the given resources and
* value to determine density information.
*/
public static Drawable createFromResourceStream(Resources res, TypedValue value,
InputStream is, String srcName) {
return createFromResourceStream(res, value, is, srcName, null);
}
/**
* Create a drawable from an inputstream, using the given resources and
* value to determine density information.
*/
public static Drawable createFromResourceStream(Resources res, TypedValue value,
InputStream is, String srcName, BitmapFactory.Options opts) {
return Drawable.createFromResourceStream(res, value, is, srcName, opts);
}
/**
* Create a drawable from an XML document. For more information on how to
* create resources in XML, see
* <a href="{@docRoot}guide/topics/resources/drawable-resource.html">Drawable Resources</a>.
*/
public static Drawable createFromXml(Resources r, XmlPullParser parser)
throws XmlPullParserException, IOException {
return createFromXml(r, parser, null);
}
/**
* Create a drawable from an XML document using an optional {@link Resources.Theme}.
* For more information on how to create resources in XML, see
* <a href="{@docRoot}guide/topics/resources/drawable-resource.html">Drawable Resources</a>.
*/
public static Drawable createFromXml(Resources r, XmlPullParser parser, Resources.Theme theme)
throws XmlPullParserException, IOException {
AttributeSet attrs = Xml.asAttributeSet(parser);
int type;
while ((type=parser.next()) != XmlPullParser.START_TAG &&
type != XmlPullParser.END_DOCUMENT) {
// Empty loop
}
if (type != XmlPullParser.START_TAG) {
throw new XmlPullParserException("No start tag found");
}
Drawable drawable = createFromXmlInner(r, parser, attrs, theme);
if (drawable == null) {
throw new RuntimeException("Unknown initial tag: " + parser.getName());
}
return drawable;
}
/**
* Create a drawable from inside an XML document using an optional
* {@link Resources.Theme}. Called on a parser positioned at a tag in an XML
* document, tries to create a Drawable from that tag. Returns {@code null}
* if the tag is not a valid drawable.
*/
public static Drawable createFromXmlInner(Resources r, XmlPullParser parser, AttributeSet attrs,
Resources.Theme theme)
throws XmlPullParserException, IOException {
Drawable drawable = null;
final String name = parser.getName();
try {
Class<? extends Drawable> clazz = CLASS_MAP.get(name);
if (clazz != null) {
drawable = clazz.newInstance();
} else if (name.indexOf('.') > 0) {
drawable = (Drawable) Class.forName(name).newInstance();
}
} catch (Exception e) {
throw new XmlPullParserException("Error while inflating drawable resource", parser, e);
}
if (drawable == null) {
if(Android.isLollipop()) {
return Drawable.createFromXmlInner(r, parser, attrs, theme);
}
return Drawable.createFromXmlInner(r, parser, attrs);
}
IMPL.inflate(drawable, r, parser, attrs, theme);
return drawable;
}
private static Drawable getCachedDrawable(LongSparseArray<WeakReference<Drawable.ConstantState>> cache,
long key, Resources res) {
synchronized (mAccessLock) {
WeakReference<Drawable.ConstantState> wr = cache.get(key);
if (wr != null) {
Drawable.ConstantState entry = wr.get();
if (entry != null) {
return entry.newDrawable(res);
} else {
cache.delete(key);
}
}
}
return null;
}
public static Drawable getDrawable(Resources res, int resid, Resources.Theme theme) {
Log.i("ResourcesCompat", res.getResourceName(resid));
TypedValue value = new TypedValue();
res.getValue(resid, value, true);
return loadDrawable(res, value, theme);
}
public static Drawable getDrawable(Resources res, int resid) {
return getDrawable(res, resid, null);
}
public static Drawable getDrawable(TypedArray array, int index, Resources.Theme theme) {
TypedValue value = new TypedValue();
array.getValue(index, value);
return loadDrawable(array.getResources(), value, theme);
}
public static Drawable getDrawable(TypedArray array, int index) {
return getDrawable(array, index, null);
}
public static Drawable loadDrawable(Resources res, TypedValue value, Resources.Theme theme)
throws Resources.NotFoundException {
if (value == null || value.resourceId == 0) {
return null;
}
final boolean isColorDrawable;
final LongSparseArray<WeakReference<Drawable.ConstantState>> cache;
final long key;
if(value.type >= TypedValue.TYPE_FIRST_COLOR_INT
&& value.type <= TypedValue.TYPE_LAST_COLOR_INT){
isColorDrawable = true;
cache = sColorDrawableCache;
key = value.data;
}else{
isColorDrawable = false;
cache = sDrawableCache;
key = (long) value.assetCookie << 32 | value.data;
}
Drawable dr = getCachedDrawable(cache, key, res);
if (dr != null) {
return dr;
}
Drawable.ConstantState cs = null;
//TODO hm do i need implement preloading of drawables?
if(cs != null){
final Drawable cloneDr = cs.newDrawable(res);
if(theme != null){
dr = cloneDr.mutate();
applyTheme(dr, theme);
}else{
dr = cloneDr;
}
}else if(isColorDrawable){
dr = new ColorDrawable(value.data);
}else{
dr = loadDrawableForCookie(value, value.resourceId, res, theme);
}
if (dr != null) {
dr.setChangingConfigurations(value.changingConfigurations);
cacheDrawable(value, res, theme, isColorDrawable, key, dr, cache);
}
return dr;
}
private static void cacheDrawable(TypedValue value, Resources resources, Resources.Theme theme,
boolean isColorDrawable, long key, Drawable drawable,
LongSparseArray<WeakReference<Drawable.ConstantState>> caches){
Drawable.ConstantState cs = drawable.getConstantState();
if (cs == null) {
return;
}
synchronized (mAccessLock){
caches.put(key, new WeakReference<>(cs));
}
}
private static Drawable loadDrawableForCookie(TypedValue value, int id, Resources res, Resources.Theme theme){
if (value.string == null) {
throw new Resources.NotFoundException("Resource \"" + res.getResourceName(id) + "\" ("
+ Integer.toHexString(id) + ") is not a Drawable (color or path): " + value);
}
String file = value.string.toString();
final Drawable dr;
if (file.endsWith(".xml")) {
try {
XmlResourceParser rp = res.getAssets().openXmlResourceParser(value.assetCookie,
file);
dr = DrawablesCompat.createFromXml(res, rp, theme);
rp.close();
} catch (Exception e) {
Log.w(DrawablesCompat.class.getSimpleName(), "Failed to load drawable resource, " +
"using a fallback...", e);
return res.getDrawable(value.resourceId);
}
} else {
try {
InputStream is = res.getAssets().openNonAssetFd(value.assetCookie, file)
.createInputStream();
dr = DrawablesCompat.createFromResourceStream(res, value, is, file, null);
is.close();
} catch (Exception e) {
Log.w(DrawablesCompat.class.getSimpleName(), "Failed to load drawable resource, " +
"using a fallback...", e);
return res.getDrawable(value.resourceId);
}
}
return dr;
}
/**
* Create a drawable from file path name.
*/
public static Drawable createFromPath(String pathName) {
return Drawable.createFromPath(pathName);
}
private interface IDrawable{
void applyTheme(Drawable drawable, Resources.Theme t);
boolean canApplyTheme(Drawable drawable);
void inflate(Drawable drawable, Resources r, XmlPullParser parser, AttributeSet attrs,
Resources.Theme theme) throws XmlPullParserException, IOException;
}
static class BaseDrawableImpl implements IDrawable {
@Override
public void applyTheme(Drawable drawable, Resources.Theme t) {
}
@Override
public boolean canApplyTheme(Drawable drawable) {
return false;
}
@Override
public void inflate(Drawable drawable, Resources r, XmlPullParser parser, AttributeSet attrs,
Resources.Theme theme) throws XmlPullParserException, IOException {
if(drawable instanceof LollipopDrawable){
((LollipopDrawable) drawable).inflate(r, parser, attrs, theme);
return;
}
drawable.inflate(r, parser, attrs);
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
static class LollipopDrawableImpl extends BaseDrawableImpl {
@Override
public void applyTheme(Drawable drawable, Resources.Theme t) {
drawable.applyTheme(t);
}
@Override
public boolean canApplyTheme(Drawable drawable) {
return drawable.canApplyTheme();
}
@Override
public void inflate(Drawable drawable, Resources r, XmlPullParser parser, AttributeSet attrs,
Resources.Theme theme) throws XmlPullParserException, IOException {
drawable.inflate(r, parser, attrs, theme);
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment