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67 lines (61 loc) · 2.29 KB
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/**
* 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 org.androidannotations.api.bundle;
import java.lang.reflect.Array;
import android.os.Bundle;
import android.os.Parcelable;
/**
* Utility class for working with {@link Bundle} objects.
*/
public class BundleHelper {
private BundleHelper() {
}
/**
* 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;
}
}