This method extracts a Parcelable array from the Bundle , and returns it in an array whose type is the exact Parcelable subclass. - Android Android OS

Android examples for Android OS:Parcel

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Description

This method extracts a Parcelable array from the Bundle , and returns it in an array whose type is the exact Parcelable subclass.

Demo Code

/**//from  ww w. jav  a2 s  .  c  om
 * Copyright (C) 2010-2015 eBusiness Information, Excilys Group
 *
 * 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.java2s;
import java.lang.reflect.Array;
import android.os.Bundle;
import android.os.Parcelable;

public class Main {
    /**
     * This method extracts a {@link Parcelable} array from the {@link Bundle},
     * and returns it in an array whose type is the exact {@link Parcelable}
     * subclass. This is needed because {@link Bundle#getParcelable(String)}
     * returns an array of {@link Parcelable}, and we would get
     * {@link ClassCastException} when we assign it to {@link Parcelable}
     * subclass arrays.
     * 
     * For more info, see <a
     * href="https://github.com/excilys/androidannotations/issues/1208">this</a>
     * url.
     * 
     * @param bundle
     *            the bundle holding the array which is extracted
     * @param key
     *            the array is associated with this key
     * @param type
     *            the desired type of the returned array
     * @param <T>
     *            the element type of the returned array
     * @return a {@link Parcelable} subclass typed array which holds the objects
     *         from {@link Bundle#getParcelableArray(String)} or
     *         <code>null</code> if {@link Bundle#getParcelableArray(String)}
     *         returned <code>null</code> for the key
     */
    @SuppressWarnings("unchecked")
    public static <T extends Parcelable> T[] getParcelableArray(
            Bundle bundle, String key, Class<T[]> type) {
        Parcelable[] value = bundle.getParcelableArray(key);
        if (value == null) {
            return null;
        }
        Object copy = Array.newInstance(type.getComponentType(),
                value.length);
        System.arraycopy(value, 0, copy, 0, value.length);
        return (T[]) copy;
    }
}

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