Android example source code file (BridgeResources.java)

This example Android source code file (BridgeResources.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, bridgeresources, bridgexmlblockparser, content, file, filenotfoundexception, filereader, io, iprojectcallback, iresourcevalue, kxmlparser, notfoundexception, override, string, typedvalue, unsupportedoperationexception, util, utilities, utils, xmlpullparserexception

The BridgeResources.java Android example source code

/*
 * 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 com.android.layoutlib.bridge;

import com.android.layoutlib.api.IProjectCallback;
import com.android.layoutlib.api.IResourceValue;

import org.kxml2.io.KXmlParser;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.content.res.ColorStateList;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.ViewGroup.LayoutParams;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.InputStream;

/**
 *
 */
public final class BridgeResources extends Resources {

    private BridgeContext mContext;
    private IProjectCallback mProjectCallback;
    private boolean[] mPlatformResourceFlag = new boolean[1];

    /**
     * This initializes the static field {@link Resources#mSystem} which is used
     * by methods who get global resources using {@link Resources#getSystem()}.
     * <p/>
     * They will end up using our bridge resources.
     * <p/>
     * {@link Bridge} calls this method after setting up a new bridge.
     */
    /*package*/ static Resources initSystem(BridgeContext context,
            AssetManager assets,
            DisplayMetrics metrics,
            Configuration config,
            IProjectCallback projectCallback) {
        if (!(Resources.mSystem instanceof BridgeResources)) {
            Resources.mSystem = new BridgeResources(context,
                    assets,
                    metrics,
                    config,
                    projectCallback);
        }
        return Resources.mSystem;
    }

    /**
     * Clears the static {@link Resources#mSystem} to make sure we don't leave objects
     * around that would prevent us from unloading the library.
     */
    /*package*/ static void clearSystem() {
        if (Resources.mSystem instanceof BridgeResources) {
            ((BridgeResources)(Resources.mSystem)).mContext = null;
            ((BridgeResources)(Resources.mSystem)).mProjectCallback = null;
        }
        Resources.mSystem = null;
    }

    private BridgeResources(BridgeContext context, AssetManager assets, DisplayMetrics metrics,
            Configuration config, IProjectCallback projectCallback) {
        super(assets, metrics, config);
        mContext = context;
        mProjectCallback = projectCallback;
    }

    public BridgeTypedArray newTypeArray(int numEntries, boolean platformFile) {
        return new BridgeTypedArray(this, mContext, numEntries, platformFile);
    }

    private IResourceValue getResourceValue(int id, boolean[] platformResFlag_out) {
        // first get the String related to this id in the framework
        String[] resourceInfo = Bridge.resolveResourceValue(id);

        if (resourceInfo != null) {
            platformResFlag_out[0] = true;
            return mContext.getFrameworkResource(resourceInfo[1], resourceInfo[0]);
        }

        // didn't find a match in the framework? look in the project.
        if (mProjectCallback != null) {
            resourceInfo = mProjectCallback.resolveResourceValue(id);

            if (resourceInfo != null) {
                platformResFlag_out[0] = false;
                return mContext.getProjectResource(resourceInfo[1], resourceInfo[0]);
            }
        }

        return null;
    }

    @Override
    public Drawable getDrawable(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            return ResourceHelper.getDrawable(value, mContext, value.isFramework());
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public int getColor(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            try {
                return ResourceHelper.getColor(value.getValue());
            } catch (NumberFormatException e) {
                return 0;
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return 0;
    }

    @Override
    public ColorStateList getColorStateList(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            try {
                int color = ResourceHelper.getColor(value.getValue());
                return ColorStateList.valueOf(color);
            } catch (NumberFormatException e) {
                return null;
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public CharSequence getText(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            return value.getValue();
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public XmlResourceParser getLayout(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            File xml = new File(value.getValue());
            if (xml.isFile()) {
                // we need to create a pull parser around the layout XML file, and then
                // give that to our XmlBlockParser
                try {
                    KXmlParser parser = new KXmlParser();
                    parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
                    parser.setInput(new FileReader(xml));

                    return new BridgeXmlBlockParser(parser, mContext, mPlatformResourceFlag[0]);
                } catch (XmlPullParserException e) {
                    mContext.getLogger().error(e);

                    // we'll return null below.
                } catch (FileNotFoundException e) {
                    // this shouldn't happen since we check above.
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public TypedArray obtainAttributes(AttributeSet set, int[] attrs) {
        return mContext.obtainStyledAttributes(set, attrs);
    }

    @Override
    public TypedArray obtainTypedArray(int id) throws NotFoundException {
        throw new UnsupportedOperationException();
    }


    @Override
    public float getDimension(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                if (v.equals(BridgeConstants.MATCH_PARENT) ||
                        v.equals(BridgeConstants.FILL_PARENT)) {
                    return LayoutParams.MATCH_PARENT;
                } else if (v.equals(BridgeConstants.WRAP_CONTENT)) {
                    return LayoutParams.WRAP_CONTENT;
                }

                if (ResourceHelper.stringToFloat(v, mTmpValue) &&
                        mTmpValue.type == TypedValue.TYPE_DIMENSION) {
                    return mTmpValue.getDimension(mMetrics);
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return 0;
    }

    @Override
    public int getDimensionPixelOffset(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                if (ResourceHelper.stringToFloat(v, mTmpValue) &&
                        mTmpValue.type == TypedValue.TYPE_DIMENSION) {
                    return TypedValue.complexToDimensionPixelOffset(mTmpValue.data, mMetrics);
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return 0;
    }

    @Override
    public int getDimensionPixelSize(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                if (ResourceHelper.stringToFloat(v, mTmpValue) &&
                        mTmpValue.type == TypedValue.TYPE_DIMENSION) {
                    return TypedValue.complexToDimensionPixelSize(mTmpValue.data, mMetrics);
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return 0;
    }

    @Override
    public int getInteger(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null && value.getValue() != null) {
            String v = value.getValue();
            int radix = 10;
            if (v.startsWith("0x")) {
                v = v.substring(2);
                radix = 16;
            }
            try {
                return Integer.parseInt(v, radix);
            } catch (NumberFormatException e) {
                // return exception below
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return 0;
    }

    @Override
    public String getResourceEntryName(int resid) throws NotFoundException {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getResourceName(int resid) throws NotFoundException {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getResourceTypeName(int resid) throws NotFoundException {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getString(int id, Object... formatArgs) throws NotFoundException {
        String s = getString(id);
        if (s != null) {
            return String.format(s, formatArgs);

        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public String getString(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null && value.getValue() != null) {
            return value.getValue();
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public void getValue(int id, TypedValue outValue, boolean resolveRefs)
            throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                if (ResourceHelper.stringToFloat(v, outValue)) {
                    return;
                }

                // else it's a string
                outValue.type = TypedValue.TYPE_STRING;
                outValue.string = v;
                return;
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);
    }

    @Override
    public void getValue(String name, TypedValue outValue, boolean resolveRefs)
            throws NotFoundException {
        throw new UnsupportedOperationException();
    }

    @Override
    public XmlResourceParser getXml(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                // check this is a file
                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));

                        return new BridgeXmlBlockParser(parser, mContext, mPlatformResourceFlag[0]);
                    } catch (XmlPullParserException e) {
                        NotFoundException newE = new NotFoundException();
                        newE.initCause(e);
                        throw newE;
                    } catch (FileNotFoundException e) {
                        NotFoundException newE = new NotFoundException();
                        newE.initCause(e);
                        throw newE;
                    }
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public XmlResourceParser loadXmlResourceParser(String file, int id,
            int assetCookie, String type) throws NotFoundException {
        // even though we know the XML file to load directly, we still need to resolve the
        // id so that we can know if it's a platform or project resource.
        // (mPlatformResouceFlag will get the result and will be used later).
        getResourceValue(id, mPlatformResourceFlag);

        File f = new File(file);
        try {
            KXmlParser parser = new KXmlParser();
            parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
            parser.setInput(new FileReader(f));

            return new BridgeXmlBlockParser(parser, mContext, mPlatformResourceFlag[0]);
        } catch (XmlPullParserException e) {
            NotFoundException newE = new NotFoundException();
            newE.initCause(e);
            throw newE;
        } catch (FileNotFoundException e) {
            NotFoundException newE = new NotFoundException();
            newE.initCause(e);
            throw newE;
        }
    }


    @Override
    public InputStream openRawResource(int id) throws NotFoundException {
        IResourceValue value = getResourceValue(id, mPlatformResourceFlag);

        if (value != null) {
            String v = value.getValue();

            if (v != null) {
                // check this is a file
                File f = new File(value.getValue());
                if (f.isFile()) {
                    try {
                        return new FileInputStream(f);
                    } catch (FileNotFoundException e) {
                        NotFoundException newE = new NotFoundException();
                        newE.initCause(e);
                        throw newE;
                    }
                }
            }
        }

        // id was not found or not resolved. Throw a NotFoundException.
        throwException(id);

        // this is not used since the method above always throws
        return null;
    }

    @Override
    public InputStream openRawResource(int id, TypedValue value) throws NotFoundException {
        getValue(id, value, true);

        File f = new File(value.string.toString());
        if (f.isFile()) {
            try {
                return new FileInputStream(f);
            } catch (FileNotFoundException e) {
                NotFoundException exception = new NotFoundException();
                exception.initCause(e);
                throw exception;
            }
        }

        throw new NotFoundException();
    }

    @Override
    public AssetFileDescriptor openRawResourceFd(int id) throws NotFoundException {
        throw new UnsupportedOperationException();
    }

    /**
     * Builds and throws a {@link Resources.NotFoundException} based on a resource id and a resource type.
     * @param id the id of the resource
     * @throws NotFoundException
     */
    private void throwException(int id) throws NotFoundException {
        // first get the String related to this id in the framework
        String[] resourceInfo = Bridge.resolveResourceValue(id);

        // if the name is unknown in the framework, get it from the custom view loader.
        if (resourceInfo == null && mProjectCallback != null) {
            resourceInfo = mProjectCallback.resolveResourceValue(id);
        }

        String message = null;
        if (resourceInfo != null) {
            message = String.format(
                    "Could not find %1$s resource matching value 0x%2$X (resolved name: %3$s) in current configuration.",
                    resourceInfo[1], id, resourceInfo[0]);
        } else {
            message = String.format(
                    "Could not resolve resource value: 0x%1$X.", id);
        }

        throw new NotFoundException(message);
    }
}