Disable print service while running WorkflowTests

package com.android.printspooler.outofprocess.tests;

import static android.content.pm.PackageManager.GET_META_DATA;

import static android.content.pm.PackageManager.GET_SERVICES;

import static org.junit.Assert.assertTrue;

import static org.junit.Assume.assumeTrue;

import static org.mockito.Matchers.any;

import android.annotation.NonNull;

import android.app.Instrumentation;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.os.CancellationSignal;

import android.os.ParcelFileDescriptor;

import android.print.PrintAttributes;

import android.printservice.CustomPrinterIconCallback;

import android.printservice.PrintJob;

import android.printservice.PrintService;

import android.provider.Settings;

import android.support.test.InstrumentationRegistry;

import android.support.test.rule.ActivityTestRule;

import android.support.test.uiautomator.UiDevice;

import com.android.printspooler.outofprocess.tests.mockservice.StubbablePrinterDiscoverySession;

import org.junit.After;

import org.junit.AfterClass;

import org.junit.Before;

import org.junit.BeforeClass;

import org.junit.Rule;

    protected static final long OPERATION_TIMEOUT = 30000;

    private static final String PM_CLEAR_SUCCESS_OUTPUT = "Success";

    private static final int CURRENT_USER_ID = -2; // Mirrors UserHandle.USER_CURRENT

    private static String sDisabledPrintServicesBefore;

    private android.print.PrintJob mPrintJob;

        // Make sure we start with a clean slate.

        clearPrintSpoolerData();

        disablePrintServices(sInstrumentation.getTargetContext().getPackageName());

        // Workaround for dexmaker bug: https://code.google.com/p/dexmaker/issues/detail?id=2

        // Dexmaker is used by mockito.

        System.setProperty("dexmaker.dexcache", getInstrumentation()

                .getTargetContext().getCacheDir().getPath());

    }

    @AfterClass

    public static void tearDownClass() throws Exception {

        enablePrintServices();

    }

    @Before

    public void unlockScreen() throws Exception {

        // Unlock screen.

        runShellCommand(getInstrumentation(), "input keyevent KEYCODE_WAKEUP");

        runShellCommand(getInstrumentation(), "wm dismiss-keyguard");

        runShellCommand("input keyevent KEYCODE_WAKEUP");

        runShellCommand("wm dismiss-keyguard");

    }

    @After

        return mActivityRule.getActivity();

    }

    public static String runShellCommand(Instrumentation instrumentation, String cmd)

    public static String runShellCommand(String cmd)

            throws IOException {

        ParcelFileDescriptor pfd = instrumentation.getUiAutomation().executeShellCommand(cmd);

        ParcelFileDescriptor pfd = getInstrumentation().getUiAutomation().executeShellCommand(cmd);

        byte[] buf = new byte[512];

        int bytesRead;

        FileInputStream fis = new ParcelFileDescriptor.AutoCloseInputStream(pfd);

    }

    protected static void clearPrintSpoolerData() throws Exception {

        assertTrue("failed to clear print spooler data",

                runShellCommand(getInstrumentation(), String.format(

                        "pm clear --user %d %s", CURRENT_USER_ID,

                        PrintManager.PRINT_SPOOLER_PACKAGE_NAME))

                        .contains(PM_CLEAR_SUCCESS_OUTPUT));

        assertTrue("failed to clear print spooler data", runShellCommand(

                String.format("pm clear --user %d %s", CURRENT_USER_ID,

                        PrintManager.PRINT_SPOOLER_PACKAGE_NAME)).contains(

                PM_CLEAR_SUCCESS_OUTPUT));

    }

    /**

     * Disable all print services beside the ones we want to leave enabled.

     *

     * @param packageToLeaveEnabled The package of the services to leave enabled.

     */

    private static void disablePrintServices(String packageToLeaveEnabled) throws IOException {

        Instrumentation instrumentation = getInstrumentation();

        sDisabledPrintServicesBefore = runShellCommand(

                "settings get secure " + Settings.Secure.DISABLED_PRINT_SERVICES);

        Intent printServiceIntent = new Intent(android.printservice.PrintService.SERVICE_INTERFACE);

        List<ResolveInfo> installedServices = instrumentation.getContext().getPackageManager()

                .queryIntentServices(printServiceIntent, GET_SERVICES | GET_META_DATA);

        StringBuilder builder = new StringBuilder();

        for (ResolveInfo service : installedServices) {

            if (packageToLeaveEnabled.equals(service.serviceInfo.packageName)) {

                continue;

            }

            if (builder.length() > 0) {

                builder.append(":");

            }

            builder.append(new ComponentName(service.serviceInfo.packageName,

                    service.serviceInfo.name).flattenToString());

        }

        runShellCommand(

                "settings put secure " + Settings.Secure.DISABLED_PRINT_SERVICES + " " + builder);

    }

    /**

     * Revert {@link #disablePrintServices(String)}

     */

    private static  void enablePrintServices() throws IOException {

        runShellCommand("settings put secure " + Settings.Secure.DISABLED_PRINT_SERVICES + " "

                        + sDisabledPrintServicesBefore);

    }

    @SuppressWarnings("unchecked")