39 lines
1.5 KiB
Java
39 lines
1.5 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package android.content.res;
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import android.annotation.AnyRes;
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/**
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* Provides a set of utility methods for dealing with Resource IDs.
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* @hide
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*/
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public final class ResourceId {
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/**
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* Checks whether the integer {@code id} is a valid resource ID, as generated by AAPT.
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* <p>Note that a negative integer is not necessarily an invalid resource ID, and custom
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* validations that compare the {@code id} against {@code 0} are incorrect.</p>
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* @param id The integer to validate.
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* @return {@code true} if the integer is a valid resource ID.
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*/
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public static boolean isValid(@AnyRes int id) {
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// With the introduction of packages with IDs > 0x7f, resource IDs can be negative when
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// represented as a signed Java int. Some legacy code assumes -1 is an invalid resource ID,
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// despite the existing documentation.
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return id != -1 && (id & 0xff000000) != 0 && (id & 0x00ff0000) != 0;
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}
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}
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