app_Settings/tests/componenttests/src/com/android/settings/testutils/AdbUtils.java

/*
 * Copyright (C) 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 com.android.settings.testutils;

import android.os.ParcelFileDescriptor;
import android.text.TextUtils;
import android.util.Log;

import androidx.test.platform.app.InstrumentationRegistry;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.Optional;

public class AdbUtils {
    public static boolean checkStringInAdbCommandOutput(String logTag, String command,
            String prefix, String target, int timeoutInMillis) throws Exception {
        long start = System.nanoTime();
        //Sometimes the change do no reflect in adn output immediately, so need a wait and poll here
        while (System.nanoTime() - start < (timeoutInMillis * 1000000)) {
            try (ParcelFileDescriptor.AutoCloseInputStream in =
                         new ParcelFileDescriptor.AutoCloseInputStream(
                                 InstrumentationRegistry.getInstrumentation()
                                         .getUiAutomation()
                                         .executeShellCommand(command))) {
                try (BufferedReader br =
                             new BufferedReader(
                                     new InputStreamReader(in, StandardCharsets.UTF_8))) {
                    Optional<String> resultOptional = br.lines().filter(line -> {
                        Log.d(logTag, line);
                        return TextUtils.isEmpty(prefix) || line.contains(prefix);
                    }).findFirst();
                    String result = resultOptional.get();
                    if (result.contains(target)) {
                        return true;
                    } else {
                        Thread.sleep(100);
                    }
                }
            } catch (Exception e) {
                throw e;
            }
        }

        return false;
    }
}