ThreadUtils.java
/*
* Copyright 2020 The Android Open Source Project
*
* 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 androidx.car.app.utils;
import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import android.os.Handler;
import android.os.Looper;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
/**
* Utility functions to handle running functions on the main thread.
*
* @hide
*/
@RestrictTo(LIBRARY)
public final class ThreadUtils {
private static final Handler HANDLER = new Handler(Looper.getMainLooper());
/** Executes the {@code action} on the main thread. */
public static void runOnMain(@NonNull Runnable action) {
if (Looper.getMainLooper() == Looper.myLooper()) {
action.run();
} else {
HANDLER.post(action);
}
}
/**
* Checks that currently running on the main thread.
*
* @throws IllegalStateException if the current thread is not the main thread
*/
public static void checkMainThread() {
if (Looper.getMainLooper() != Looper.myLooper()) {
throw new IllegalStateException("Not running on main thread when it is required to");
}
}
private ThreadUtils() {
}
}