find Descendant View By Class - Android User Interface

Android examples for User Interface:View Find

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Description

find Descendant View By Class

Demo Code

/*/*from  w  ww  . j a va2 s. c o  m*/
 * Copyright 2011 Jonas Bengtsson
 *
 * 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 android.view.View;
import android.view.ViewGroup;

public class Main {
    public static <T extends View> T findDescendantByClass(Class<T> klass,
            View parent) {
        if (parent instanceof ViewGroup)
            return findDescendantByClass(klass, (ViewGroup) parent);
        return null;
    }

    public static <T extends View> T findDescendantByClass(Class<T> klass,
            ViewGroup parent) {
        final int count = parent.getChildCount();
        for (int i = 0; i < count; i++) {
            final View child = parent.getChildAt(i);
            if (klass.isInstance(child)) {
                @SuppressWarnings("unchecked")
                final T c = (T) child;
                return c;
            }
            if (child instanceof ViewGroup) {
                final T descendant = findDescendantByClass(klass,
                        (ViewGroup) child);
                if (descendant != null) {
                    return descendant;
                }
            }
        }
        return null;
    }
}

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