find Fragment For View In Activity - Android User Interface

Android examples for User Interface:Fragment

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Description

find Fragment For View In Activity

Demo Code

/*/*from   ww  w .jav  a 2 s  .co m*/
 * Copyright (c) 2014-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
import android.app.Activity;
import android.view.View;
import java.util.List;
import javax.annotation.Nullable;

public class Main{
    @Nullable
    private static Object findFragmentForViewInActivity(Activity activity,
            View view) {
        FragmentCompat supportLib = FragmentCompat.getSupportLibInstance();

        // Try the support library version if it is present and the activity is FragmentActivity.
        if (supportLib != null
                && supportLib.getFragmentActivityClass().isInstance(
                        activity)) {
            Object fragment = findFragmentForViewInActivity(supportLib,
                    activity, view);
            if (fragment != null) {
                return fragment;
            }
        }

        // Try the actual Android runtime version if we are on a sufficiently high API level for it to
        // exist.  Note that technically we can have both the support library and the framework
        // version in the same object instance due to FragmentActivity extending Activity (which has
        // fragment support in the system).
        FragmentCompat framework = FragmentCompat.getFrameworkInstance();
        if (framework != null) {
            Object fragment = findFragmentForViewInActivity(framework,
                    activity, view);
            if (fragment != null) {
                return fragment;
            }
        }

        return null;
    }
    private static Object findFragmentForViewInActivity(
            FragmentCompat compat, Activity activity, View view) {
        Object fragmentManager = compat.forFragmentActivity()
                .getFragmentManager(activity);
        if (fragmentManager != null) {
            return findFragmentForViewInFragmentManager(compat,
                    fragmentManager, view);
        } else {
            return null;
        }
    }
    @Nullable
    private static Object findFragmentForViewInFragmentManager(
            FragmentCompat compat, Object fragmentManager, View view) {
        List<?> fragments = compat.forFragmentManager().getAddedFragments(
                fragmentManager);

        if (fragments != null) {
            for (int i = 0, N = fragments.size(); i < N; ++i) {
                Object fragment = fragments.get(i);
                Object result = findFragmentForViewInFragment(compat,
                        fragment, view);
                if (result != null) {
                    return result;
                }
            }
        }

        return null;
    }
    @Nullable
    private static Object findFragmentForViewInFragment(
            FragmentCompat compat, Object fragment, View view) {
        FragmentAccessor accessor = compat.forFragment();

        if (accessor.getView(fragment) == view) {
            return fragment;
        }

        Object childFragmentManager = accessor
                .getChildFragmentManager(fragment);
        if (childFragmentManager != null) {
            return findFragmentForViewInFragmentManager(compat,
                    childFragmentManager, view);
        }

        return null;
    }
}

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