/*
Copyright 2013 Paul LeBeau, Cave Rock Software Ltd.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.caverock.androidsvg;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Paint;
import android.graphics.Picture;
import android.graphics.drawable.PictureDrawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
/**
* SVGImageView is a View widget that allows users to include SVG images in their layouts.
*
* It is implemented as a thin layer over {@code android.widget.ImageView}.
* <p>
* In its present form it has one significant limitation. It uses the {@link SVG#renderToPicture()}
* method. That means that SVG documents that use {@code <mask>} elements will not display correctly.
*
* @attr ref R.styleable#SVGImageView_svg
*/
public class SVGImageView extends ImageView
{
private static Method setLayerTypeMethod = null;
{
try
{
setLayerTypeMethod = View.class.getMethod("setLayerType", Integer.TYPE, Paint.class);
}
catch (NoSuchMethodException e) { /* do nothing */ }
}
public SVGImageView(Context context)
{
super(context);
}
public SVGImageView(Context context, AttributeSet attrs)
{
super(context, attrs, 0);
init(attrs, 0);
}
public SVGImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle)
{
if (isInEditMode())
return;
TypedArray a = getContext().getTheme()
.obtainStyledAttributes(attrs, R.styleable.SVGImageView, defStyle, 0);
try
{
int resourceId = a.getResourceId(R.styleable.SVGImageView_svg, -1);
if (resourceId != -1) {
setImageResource(resourceId);
return;
}
String url = a.getString(R.styleable.SVGImageView_svg);
if (url != null)
{
Uri uri = Uri.parse(url);
if (internalSetImageURI(uri, false))
return;
// Last chance, try loading it as an asset filename
setImageAsset(url);
}
} finally {
a.recycle();
}
}
/**
* Directly set the SVG.
*/
public void setSVG(SVG mysvg)
{
if (mysvg == null)
throw new IllegalArgumentException("Null value passed to setSVG()");
setSoftwareLayerType();
setImageDrawable(new PictureDrawable(mysvg.renderToPicture()));
}
/**
* Load an SVG image from the given resource id.
*/
@Override
public void setImageResource(int resourceId)
{
new LoadResourceTask().execute(resourceId);
}
/**
* Load an SVG image from the given resource URI.
*/
@Override
public void setImageURI(Uri uri)
{
internalSetImageURI(uri, true);
}
/**
* Load an SVG image from the given asset filename.
*/
public void setImageAsset(String filename)
{
new LoadAssetTask().execute(filename);
}
/*
* Attempt to set a picture from a Uri. Return true if it worked.
*/
private boolean internalSetImageURI(Uri uri, boolean isDirectRequestFromUser)
{
InputStream is = null;
try
{
is = getContext().getContentResolver().openInputStream(uri);
}
catch (FileNotFoundException e)
{
if (isDirectRequestFromUser)
Log.e("SVGImageView", "File not found: " + uri);
return false;
}
new LoadURITask().execute(is);
return true;
}
//===============================================================================================
private class LoadResourceTask extends AsyncTask<Integer, Integer, Picture>
{
protected Picture doInBackground(Integer... resourceId)
{
try
{
SVG svg = SVG.getFromResource(getContext(), resourceId[0]);
return svg.renderToPicture();
}
catch (SVGParseException e)
{
Log.e("SVGImageView", String.format("Error loading resource 0x%x: %s", resourceId, e.getMessage()));
}
return null;
}
protected void onPostExecute(Picture picture)
{
if (picture != null) {
setSoftwareLayerType();
setImageDrawable(new PictureDrawable(picture));
}
}
}
private class LoadAssetTask extends AsyncTask<String, Integer, Picture>
{
protected Picture doInBackground(String... filename)
{
try
{
SVG svg = SVG.getFromAsset(getContext().getAssets(), filename[0]);
return svg.renderToPicture();
}
catch (SVGParseException e)
{
Log.e("SVGImageView", "Error loading file " + filename + ": " + e.getMessage());
}
catch (FileNotFoundException e)
{
Log.e("SVGImageView", "File not found: " + filename);
}
catch (IOException e)
{
Log.e("SVGImageView", "Unable to load asset file: " + filename, e);
}
return null;
}
protected void onPostExecute(Picture picture)
{
if (picture != null) {
setSoftwareLayerType();
setImageDrawable(new PictureDrawable(picture));
}
}
}
private class LoadURITask extends AsyncTask<InputStream, Integer, Picture>
{
protected Picture doInBackground(InputStream... is)
{
try
{
SVG svg = SVG.getFromInputStream(is[0]);
return svg.renderToPicture();
}
catch (SVGParseException e)
{
Log.e("SVGImageView", "Parse error loading URI: " + e.getMessage());
}
finally
{
try
{
is[0].close();
}
catch (IOException e) { /* do nothing */ }
}
return null;
}
protected void onPostExecute(Picture picture)
{
if (picture != null) {
setSoftwareLayerType();
setImageDrawable(new PictureDrawable(picture));
}
}
}
//===============================================================================================
/*
* Use reflection to call an API 11 method from this library (which is configured with a minSdkVersion of 8)
*/
private void setSoftwareLayerType()
{
if (setLayerTypeMethod == null)
return;
try
{
int LAYER_TYPE_SOFTWARE = View.class.getField("LAYER_TYPE_SOFTWARE").getInt(new View(getContext()));
setLayerTypeMethod.invoke(this, LAYER_TYPE_SOFTWARE, null);
}
catch (Exception e)
{
Log.w("SVGImageView", "Unexpected failure calling setLayerType", e);
}
}
}