com.facebook.react.bridge.UiThreadUtil.java Source code

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Here is the source code for com.facebook.react.bridge.UiThreadUtil.java

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/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.facebook.react.bridge;

import android.os.Handler;
import android.os.Looper;
import androidx.annotation.Nullable;

/** Utility for interacting with the UI thread. */
public class UiThreadUtil {

    @Nullable
    private static Handler sMainHandler;

    /** @return {@code true} if the current thread is the UI thread. */
    public static boolean isOnUiThread() {
        return Looper.getMainLooper().getThread() == Thread.currentThread();
    }

    /** Throws an {@link AssertionException} if the current thread is not the UI thread. */
    public static void assertOnUiThread() {
        SoftAssertions.assertCondition(isOnUiThread(), "Expected to run on UI thread!");
    }

    /** Throws an {@link AssertionException} if the current thread is the UI thread. */
    public static void assertNotOnUiThread() {
        SoftAssertions.assertCondition(!isOnUiThread(), "Expected not to run on UI thread!");
    }

    /** Runs the given {@code Runnable} on the UI thread. */
    public static void runOnUiThread(Runnable runnable) {
        runOnUiThread(runnable, 0);
    }

    /** Runs the given {@code Runnable} on the UI thread with the specified delay. */
    public static void runOnUiThread(Runnable runnable, long delayInMs) {
        synchronized (UiThreadUtil.class) {
            if (sMainHandler == null) {
                sMainHandler = new Handler(Looper.getMainLooper());
            }
        }
        sMainHandler.postDelayed(runnable, delayInMs);
    }
}