org.solovyev.android.Threads.java Source code

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Here is the source code for org.solovyev.android.Threads.java

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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: se.solovyev@gmail.com
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android;

import android.app.Activity;
import android.os.Handler;
import android.os.Looper;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public final class Threads {

    private Threads() {
        throw new AssertionError();
    }

    /**
     * Method tries to run <var>runnable</var> on UI thread. Run can be failed if:
     * 1. Specified <var>activity</var> is null
     * 2. Specified <var>activity</var> is finishing
     *
     * @param activity activity bound to runnable
     * @param runnable runnable to bve executed
     */
    public static void tryRunOnUiThread(@Nullable final Activity activity, @Nonnull final Runnable runnable) {
        if (activity != null && !activity.isFinishing()) {
            if (isUiThread()) {
                runnable.run();
            } else {
                activity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        // some time may pass and activity might be closing
                        if (!activity.isFinishing()) {
                            runnable.run();
                        }
                    }
                });
            }
        }
    }

    public static void tryRunOnUiThread(@Nonnull final Fragment fragment, @Nonnull final Runnable runnable) {
        Threads.tryRunOnUiThread(fragment.getActivity(), new Runnable() {
            @Override
            public void run() {
                final FragmentActivity activity = fragment.getActivity();
                if (activity != null) {
                    runnable.run();
                }
            }
        });
    }

    /**
     * @return true if current thread is UI thread (= main application thread)
     */
    public static boolean isUiThread() {
        return Looper.myLooper() == Looper.getMainLooper();
    }

    /**
     * @return new instance of {@link Handler} which runs on UI thread
     */
    @Nonnull
    public static Handler newUiHandler() {
        return new Handler(Looper.getMainLooper());
    }
}