/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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 android.view;
import com.android.layoutlib.api.IProjectCallback;
import com.android.layoutlib.api.IResourceValue;
import com.android.layoutlib.bridge.Bridge;
import com.android.layoutlib.bridge.BridgeConstants;
import com.android.layoutlib.bridge.BridgeContext;
import com.android.layoutlib.bridge.BridgeXmlBlockParser;
import org.kxml2.io.KXmlParser;
import org.xmlpull.v1.XmlPullParser;
import android.content.Context;
import android.util.AttributeSet;
import java.io.File;
import java.io.FileReader;
/**
* Custom implementation of {@link LayoutInflater} to handle custom views.
*/
public final class BridgeInflater extends LayoutInflater {
private final IProjectCallback mProjectCallback;
/**
* List of class prefixes which are tried first by default.
* <p/>
* This should match the list in com.android.internal.policy.impl.PhoneLayoutInflater.
*/
private static final String[] sClassPrefixList = {
"android.widget.",
"android.webkit."
};
protected BridgeInflater(LayoutInflater original, Context newContext) {
super(original, newContext);
mProjectCallback = null;
}
/**
* Instantiate a new BridgeInflater with an {@link IProjectCallback} object.
*
* @param context The Android application context.
* @param projectCallback the {@link IProjectCallback} object.
*/
public BridgeInflater(Context context, IProjectCallback projectCallback) {
super(context);
mProjectCallback = projectCallback;
mConstructorArgs[0] = context;
}
@Override
public View onCreateView(String name, AttributeSet attrs) throws ClassNotFoundException {
View view = null;
try {
// First try to find a class using the default Android prefixes
for (String prefix : sClassPrefixList) {
try {
view = createView(name, prefix, attrs);
if (view != null) {
break;
}
} catch (ClassNotFoundException e) {
// Ignore. We'll try again using the base class below.
}
}
// Next try using the parent loader. This will most likely only work for
// fully-qualified class names.
try {
if (view == null) {
view = super.onCreateView(name, attrs);
}
} catch (ClassNotFoundException e) {
// Ignore. We'll try again using the custom view loader below.
}
// Finally try again using the custom view loader
try {
if (view == null) {
view = loadCustomView(name, attrs);
}
} catch (ClassNotFoundException e) {
// If the class was not found, we throw the exception directly, because this
// method is already expected to throw it.
throw e;
}
} catch (Exception e) {
// Wrap the real exception in a ClassNotFoundException, so that the calling method
// can deal with it.
ClassNotFoundException exception = new ClassNotFoundException("onCreateView", e);
throw exception;
}
setupViewInContext(view, attrs);
return view;
}
@Override
public View createViewFromTag(String name, AttributeSet attrs) {
View view = null;
try {
view = super.createViewFromTag(name, attrs);
} catch (InflateException e) {
// try to load the class from using the custom view loader
try {
view = loadCustomView(name, attrs);
} catch (Exception e2) {
// Wrap the real exception in an InflateException so that the calling
// method can deal with it.
InflateException exception = new InflateException();
if (e2.getClass().equals(ClassNotFoundException.class) == false) {
exception.initCause(e2);
} else {
exception.initCause(e);
}
throw exception;
}
}
setupViewInContext(view, attrs);
return view;
}
@Override
public View inflate(int resource, ViewGroup root) {
Context context = getContext();
if (context instanceof BridgeContext) {
BridgeContext bridgeContext = (BridgeContext)context;
IResourceValue value = null;
String[] layoutInfo = Bridge.resolveResourceValue(resource);
if (layoutInfo != null) {
value = bridgeContext.getFrameworkResource(BridgeConstants.RES_LAYOUT,
layoutInfo[0]);
} else {
layoutInfo = mProjectCallback.resolveResourceValue(resource);
if (layoutInfo != null) {
value = bridgeContext.getProjectResource(BridgeConstants.RES_LAYOUT,
layoutInfo[0]);
}
}
if (value != null) {
File f = new File(value.getValue());
if (f.isFile()) {
try {
KXmlParser parser = new KXmlParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(new FileReader(f));
BridgeXmlBlockParser bridgeParser = new BridgeXmlBlockParser(
parser, bridgeContext, false);
return inflate(bridgeParser, root);
} catch (Exception e) {
bridgeContext.getLogger().error(e);
// return null below.
}
}
}
}
return null;
}
private View loadCustomView(String name, AttributeSet attrs) throws ClassNotFoundException,
Exception{
if (mProjectCallback != null) {
// first get the classname in case it's not the node name
if (name.equals("view")) {
name = attrs.getAttributeValue(null, "class");
}
mConstructorArgs[1] = attrs;
Object customView = mProjectCallback.loadView(name, mConstructorSignature,
mConstructorArgs);
if (customView instanceof View) {
return (View)customView;
}
}
return null;
}
private void setupViewInContext(View view, AttributeSet attrs) {
if (getContext() instanceof BridgeContext) {
BridgeContext bc = (BridgeContext) getContext();
if (attrs instanceof BridgeXmlBlockParser) {
Object viewKey = ((BridgeXmlBlockParser) attrs).getViewKey();
if (viewKey != null) {
bc.addViewKey(view, viewKey);
}
}
}
}
@Override
public LayoutInflater cloneInContext(Context newContext) {
return new BridgeInflater(this, newContext);
}
}
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