Android example source code file (ComponentInfo.java)

This example Android source code file (ComponentInfo.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, applicationinfo, charsequence, componentinfo, drawable, drawing, graphics, os, override, packageiteminfo, paint, string, util

The ComponentInfo.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 android.content.pm;

import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.util.Printer;

/**
 * Base class containing information common to all application components
 * ({@link ActivityInfo}, {@link ServiceInfo}).  This class is not intended
 * to be used by itself; it is simply here to share common definitions
 * between all application components.  As such, it does not itself
 * implement Parcelable, but does provide convenience methods to assist
 * in the implementation of Parcelable in subclasses.
 */
public class ComponentInfo extends PackageItemInfo {
    /**
     * Global information about the application/package this component is a
     * part of.
     */
    public ApplicationInfo applicationInfo;
    
    /**
     * The name of the process this component should run in.
     * From the "android:process" attribute or, if not set, the same
     * as <var>applicationInfo.processName.
     */
    public String processName;

    /**
     * A string resource identifier (in the package's resources) containing
     * a user-readable description of the component.  From the "description"
     * attribute or, if not set, 0.
     */
    public int descriptionRes;
    
    /**
     * Indicates whether or not this component may be instantiated.  Note that this value can be
     * overriden by the one in its parent {@link ApplicationInfo}.
     */
    public boolean enabled = true;

    /**
     * Set to true if this component is available for use by other applications.
     * Comes from {@link android.R.attr#exported android:exported} of the
     * <activity>, <receiver>, <service>, or
     * <provider> tag.
     */
    public boolean exported = false;
    
    public ComponentInfo() {
    }

    public ComponentInfo(ComponentInfo orig) {
        super(orig);
        applicationInfo = orig.applicationInfo;
        processName = orig.processName;
        descriptionRes = orig.descriptionRes;
        enabled = orig.enabled;
        exported = orig.exported;
    }

    @Override public CharSequence loadLabel(PackageManager pm) {
        if (nonLocalizedLabel != null) {
            return nonLocalizedLabel;
        }
        ApplicationInfo ai = applicationInfo;
        CharSequence label;
        if (labelRes != 0) {
            label = pm.getText(packageName, labelRes, ai);
            if (label != null) {
                return label;
            }
        }
        if (ai.nonLocalizedLabel != null) {
            return ai.nonLocalizedLabel;
        }
        if (ai.labelRes != 0) {
            label = pm.getText(packageName, ai.labelRes, ai);
            if (label != null) {
                return label;
            }
        }
        return name;
    }
    
    /**
     * Return the icon resource identifier to use for this component.  If
     * the component defines an icon, that is used; else, the application
     * icon is used.
     * 
     * @return The icon associated with this component.
     */
    public final int getIconResource() {
        return icon != 0 ? icon : applicationInfo.icon;
    }
    
    protected void dumpFront(Printer pw, String prefix) {
        super.dumpFront(pw, prefix);
        pw.println(prefix + "enabled=" + enabled + " exported=" + exported
                + " processName=" + processName);
        if (descriptionRes != 0) {
            pw.println(prefix + "description=" + descriptionRes);
        }
    }
    
    protected void dumpBack(Printer pw, String prefix) {
        if (applicationInfo != null) {
            pw.println(prefix + "ApplicationInfo:");
            applicationInfo.dump(pw, prefix + "  ");
        } else {
            pw.println(prefix + "ApplicationInfo: null");
        }
        super.dumpBack(pw, prefix);
    }
    
    public void writeToParcel(Parcel dest, int parcelableFlags) {
        super.writeToParcel(dest, parcelableFlags);
        applicationInfo.writeToParcel(dest, parcelableFlags);
        dest.writeString(processName);
        dest.writeInt(descriptionRes);
        dest.writeInt(enabled ? 1 : 0);
        dest.writeInt(exported ? 1 : 0);
    }
    
    protected ComponentInfo(Parcel source) {
        super(source);
        applicationInfo = ApplicationInfo.CREATOR.createFromParcel(source);
        processName = source.readString();
        descriptionRes = source.readInt();
        enabled = (source.readInt() != 0);
        exported = (source.readInt() != 0);
    }
    
    /**
     * @hide
     */
    @Override protected Drawable loadDefaultIcon(PackageManager pm) {
        return applicationInfo.loadIcon(pm);
    }
    
    /**
     * @hide
     */
    @Override protected ApplicationInfo getApplicationInfo() {
        return applicationInfo;
    }
}