Am命令

Am.java中：

Override
    public void onRun() throws Exception {
        mAm = ActivityManagerNative.getDefault();
        if (mAm == null) {
            System.err.println(NO_SYSTEM_ERROR_CODE);
            throw new AndroidException("Can't connect to activity manager; is the system running?");
        }
        String op = nextArgRequired();
        if (op.equals("start")) {
            runStart();
...

private Intent makeIntent(int defUser) throws URISyntaxException {
        Intent intent = new Intent();
        Intent baseIntent = intent;
        boolean hasIntentInfo = false;
        mStartFlags = 0;
        mWaitOption = false;
        mStopOption = false;
        mRepeat = 0;
        mProfileFile = null;
        mUserId = defUser;
        Uri data = null;
        String type = null;
        String opt;
        while ((opt=nextOption()) != null) {
            if (opt.equals("-a")) {
                intent.setAction(nextArgRequired());
                if (intent == baseIntent) {
                    hasIntentInfo = true;
                }
            } else if (opt.equals("-d")) {
                data = Uri.parse(nextArgRequired());
                if (intent == baseIntent) {
                    hasIntentInfo = true;
                }
            } else if (opt.equals("-t")) {
                type = nextArgRequired();
                if (intent == baseIntent) {
                    hasIntentInfo = true;
                }
            } else if (opt.equals("-c")) {
                intent.addCategory(nextArgRequired());
                if (intent == baseIntent) {
                    hasIntentInfo = true;
                }
            } else if (opt.equals("-e") || opt.equals("--es")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, value);
            } else if (opt.equals("--esn")) {
                String key = nextArgRequired();
                intent.putExtra(key, (String) null);
            } else if (opt.equals("--ei")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, Integer.valueOf(value));
            } else if (opt.equals("--eu")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, Uri.parse(value));
            } else if (opt.equals("--ecn")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                ComponentName cn = ComponentName.unflattenFromString(value);
                if (cn == null) throw new IllegalArgumentException("Bad component name: " + value);
                intent.putExtra(key, cn);
            } else if (opt.equals("--eia")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                String[] strings = value.split(",");
                int[] list = new int[strings.length];
                for (int i = 0; i < strings.length; i++) {
                    list[i] = Integer.valueOf(strings[i]);
                }
                intent.putExtra(key, list);
            } else if (opt.equals("--el")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, Long.valueOf(value));
            } else if (opt.equals("--ela")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                String[] strings = value.split(",");
                long[] list = new long[strings.length];
                for (int i = 0; i < strings.length; i++) {
                    list[i] = Long.valueOf(strings[i]);
                }
                intent.putExtra(key, list);
                hasIntentInfo = true;
            } else if (opt.equals("--ef")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, Float.valueOf(value));
                hasIntentInfo = true;
            } else if (opt.equals("--efa")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                String[] strings = value.split(",");
                float[] list = new float[strings.length];
                for (int i = 0; i < strings.length; i++) {
                    list[i] = Float.valueOf(strings[i]);
                }
                intent.putExtra(key, list);
                hasIntentInfo = true;
            } else if (opt.equals("--ez")) {
                String key = nextArgRequired();
                String value = nextArgRequired();
                intent.putExtra(key, Boolean.valueOf(value));
            } else if (opt.equals("-n")) {
                String str = nextArgRequired();
                ComponentName cn = ComponentName.unflattenFromString(str);
                if (cn == null) throw new IllegalArgumentException("Bad component name: " + str);
                intent.setComponent(cn);
                if (intent == baseIntent) {
                    hasIntentInfo = true;
                }
            } else if (opt.equals("-f")) {
                String str = nextArgRequired();
                intent.setFlags(Integer.decode(str).intValue());
            } else if (opt.equals("--grant-read-uri-permission")) {
                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            } else if (opt.equals("--grant-write-uri-permission")) {
                intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            } else if (opt.equals("--exclude-stopped-packages")) {
                intent.addFlags(Intent.FLAG_EXCLUDE_STOPPED_PACKAGES);
            } else if (opt.equals("--include-stopped-packages")) {
                intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
            } else if (opt.equals("--debug-log-resolution")) {
                intent.addFlags(Intent.FLAG_DEBUG_LOG_RESOLUTION);
            } else if (opt.equals("--activity-brought-to-front")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
            } else if (opt.equals("--activity-clear-top")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            } else if (opt.equals("--activity-clear-when-task-reset")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
            } else if (opt.equals("--activity-exclude-from-recents")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
            } else if (opt.equals("--activity-launched-from-history")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
            } else if (opt.equals("--activity-multiple-task")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
            } else if (opt.equals("--activity-no-animation")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            } else if (opt.equals("--activity-no-history")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
            } else if (opt.equals("--activity-no-user-action")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_USER_ACTION);
            } else if (opt.equals("--activity-previous-is-top")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
            } else if (opt.equals("--activity-reorder-to-front")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
            } else if (opt.equals("--activity-reset-task-if-needed")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
            } else if (opt.equals("--activity-single-top")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
            } else if (opt.equals("--activity-clear-task")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
            } else if (opt.equals("--activity-task-on-home")) {
                intent.addFlags(Intent.FLAG_ACTIVITY_TASK_ON_HOME);
            } else if (opt.equals("--receiver-registered-only")) {
                intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
            } else if (opt.equals("--receiver-replace-pending")) {
                intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
            } else if (opt.equals("--selector")) {
                intent.setDataAndType(data, type);
                intent = new Intent();
            } else if (opt.equals("-D")) {
                mStartFlags |= ActivityManager.START_FLAG_DEBUG;
            } else if (opt.equals("-W")) {
                mWaitOption = true;
            } else if (opt.equals("-P")) {
                mProfileFile = nextArgRequired();
                mStartFlags |= ActivityManager.START_FLAG_AUTO_STOP_PROFILER;
            } else if (opt.equals("--start-profiler")) {
                mProfileFile = nextArgRequired();
                mStartFlags &= ~ActivityManager.START_FLAG_AUTO_STOP_PROFILER;
            } else if (opt.equals("-R")) {
                mRepeat = Integer.parseInt(nextArgRequired());
            } else if (opt.equals("-S")) {
                mStopOption = true;
            } else if (opt.equals("--opengl-trace")) {
                mStartFlags |= ActivityManager.START_FLAG_OPENGL_TRACES;
            } else if (opt.equals("--user")) {
                mUserId = parseUserArg(nextArgRequired());
            } else if (opt.equals("--receiver-permission")) {
                mReceiverPermission = nextArgRequired();
            } else {
                System.err.println("Error: Unknown option: " + opt);
                return null;
            }
        }
        intent.setDataAndType(data, type);
        final boolean hasSelector = intent != baseIntent;
        if (hasSelector) {
            // A selector was specified; fix up.
            baseIntent.setSelector(intent);
            intent = baseIntent;
        }
        String arg = nextArg();
        baseIntent = null;
        if (arg == null) {
            if (hasSelector) {
                // If a selector has been specified, and no arguments
                // have been supplied for the main Intent, then we can
                // assume it is ACTION_MAIN CATEGORY_LAUNCHER; we don't
                // need to have a component name specified yet, the
                // selector will take care of that.
                baseIntent = new Intent(Intent.ACTION_MAIN);
                baseIntent.addCategory(Intent.CATEGORY_LAUNCHER);
            }
        } else if (arg.indexOf(':') >= 0) {
            // The argument is a URI.  Fully parse it, and use that result
            // to fill in any data not specified so far.
            baseIntent = Intent.parseUri(arg, Intent.URI_INTENT_SCHEME);
        } else if (arg.indexOf('/') >= 0) {
            // The argument is a component name.  Build an Intent to launch
            // it.
            baseIntent = new Intent(Intent.ACTION_MAIN);
            baseIntent.addCategory(Intent.CATEGORY_LAUNCHER);
            baseIntent.setComponent(ComponentName.unflattenFromString(arg));
        } else {
            // Assume the argument is a package name.
            baseIntent = new Intent(Intent.ACTION_MAIN);
            baseIntent.addCategory(Intent.CATEGORY_LAUNCHER);
            baseIntent.setPackage(arg);
        }
        if (baseIntent != null) {
            Bundle extras = intent.getExtras();
            intent.replaceExtras((Bundle)null);
            Bundle uriExtras = baseIntent.getExtras();
            baseIntent.replaceExtras((Bundle)null);
            if (intent.getAction() != null && baseIntent.getCategories() != null) {
                HashSet<String> cats = new HashSet<String>(baseIntent.getCategories());
                for (String c : cats) {
                    baseIntent.removeCategory(c);
                }
            }
            intent.fillIn(baseIntent, Intent.FILL_IN_COMPONENT | Intent.FILL_IN_SELECTOR);
            if (extras == null) {
                extras = uriExtras;
            } else if (uriExtras != null) {
                uriExtras.putAll(extras);
                extras = uriExtras;
            }
            intent.replaceExtras(extras);
            hasIntentInfo = true;
        }
        if (!hasIntentInfo) throw new IllegalArgumentException("No intent supplied");
        return intent;
    }

private void runStart() throws Exception {
        Intent intent = makeIntent(UserHandle.USER_CURRENT);
        if (mUserId == UserHandle.USER_ALL) {
            System.err.println("Error: Can't start service with user 'all'");
            return;
        }
        String mimeType = intent.getType();
        if (mimeType == null && intent.getData() != null
                && "content".equals(intent.getData().getScheme())) {
            mimeType = mAm.getProviderMimeType(intent.getData(), mUserId);
        }
        do {
            if (mStopOption) {
                String packageName;
                if (intent.getComponent() != null) {
                    packageName = intent.getComponent().getPackageName();
                } else {
                    IPackageManager pm = IPackageManager.Stub.asInterface(
                            ServiceManager.getService("package"));
                    if (pm == null) {
                        System.err.println("Error: Package manager not running; aborting");
                        return;
                    }
                    List<ResolveInfo> activities = pm.queryIntentActivities(intent, mimeType, 0,
                            mUserId);
                    if (activities == null || activities.size() <= 0) {
                        System.err.println("Error: Intent does not match any activities: "
                                + intent);
                        return;
                    } else if (activities.size() > 1) {
                        System.err.println("Error: Intent matches multiple activities; can't stop: "
                                + intent);
                        return;
                    }
                    packageName = activities.get(0).activityInfo.packageName;
                }
                System.out.println("Stopping: " + packageName);
                mAm.forceStopPackage(packageName, mUserId);
                Thread.sleep(250);
            }
    
            System.out.println("Starting: " + intent);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    
            ParcelFileDescriptor fd = null;
    
            if (mProfileFile != null) {
                try {
                    fd = ParcelFileDescriptor.open(
                            new File(mProfileFile),
                            ParcelFileDescriptor.MODE_CREATE |
                            ParcelFileDescriptor.MODE_TRUNCATE |
                            ParcelFileDescriptor.MODE_READ_WRITE);
                } catch (FileNotFoundException e) {
                    System.err.println("Error: Unable to open file: " + mProfileFile);
                    return;
                }
            }
            IActivityManager.WaitResult result = null;
            int res;
            if (mWaitOption) {
                result = mAm.startActivityAndWait(null, null, intent, mimeType,
                            null, null, 0, mStartFlags, mProfileFile, fd, null, mUserId);
                res = result.result;
            } else {
                res = mAm.startActivityAsUser(null, null, intent, mimeType,
                        null, null, 0, mStartFlags, mProfileFile, fd, null, mUserId);
            }
            PrintStream out = mWaitOption ? System.out : System.err;
            boolean launched = false;
            switch (res) {
                case ActivityManager.START_SUCCESS:
                    launched = true;
                    break;
                case ActivityManager.START_SWITCHES_CANCELED:
                    launched = true;
                    out.println(
                            "Warning: Activity not started because the "
                            + " current activity is being kept for the user.");
                    break;
                case ActivityManager.START_DELIVERED_TO_TOP:
                    launched = true;
                    out.println(
                            "Warning: Activity not started, intent has "
                            + "been delivered to currently running "
                            + "top-most instance.");
                    break;
                case ActivityManager.START_RETURN_INTENT_TO_CALLER:
                    launched = true;
                    out.println(
                            "Warning: Activity not started because intent "
                            + "should be handled by the caller");
                    break;
                case ActivityManager.START_TASK_TO_FRONT:
                    launched = true;
                    out.println(
                            "Warning: Activity not started, its current "
                            + "task has been brought to the front");
                    break;
                case ActivityManager.START_INTENT_NOT_RESOLVED:
                    out.println(
                            "Error: Activity not started, unable to "
                            + "resolve " + intent.toString());
                    break;
                case ActivityManager.START_CLASS_NOT_FOUND:
                    out.println(NO_CLASS_ERROR_CODE);
                    out.println("Error: Activity class " +
                            intent.getComponent().toShortString()
                            + " does not exist.");
                    break;
                case ActivityManager.START_FORWARD_AND_REQUEST_CONFLICT:
                    out.println(
                            "Error: Activity not started, you requested to "
                            + "both forward and receive its result");
                    break;
                case ActivityManager.START_PERMISSION_DENIED:
                    out.println(
                            "Error: Activity not started, you do not "
                            + "have permission to access it.");
                    break;
                default:
                    out.println(
                            "Error: Activity not started, unknown error code " + res);
                    break;
            }
            if (mWaitOption && launched) {
                if (result == null) {
                    result = new IActivityManager.WaitResult();
                    result.who = intent.getComponent();
                }
                System.out.println("Status: " + (result.timeout ? "timeout" : "ok"));
                if (result.who != null) {
                    System.out.println("Activity: " + result.who.flattenToShortString());
                }
                if (result.thisTime >= 0) {
                    System.out.println("ThisTime: " + result.thisTime);
                }
                if (result.totalTime >= 0) {
                    System.out.println("TotalTime: " + result.totalTime);
                }
                System.out.println("Complete");
            }
            mRepeat--;
            if (mRepeat > 1) {
                mAm.unhandledBack();
            }
        } while (mRepeat > 1);
    }

UserHandle.java

 /** @hide A user id to indicate all users on the device */
    public static final int USER_ALL = -1;
    /** @hide A user handle to indicate all users on the device */
    public static final UserHandle ALL = new UserHandle(USER_ALL);
    /** @hide A user id to indicate the currently active user */
    public static final int USER_CURRENT = -2;
    /** @hide A user handle to indicate the current user of the device */
    public static final UserHandle CURRENT = new UserHandle(USER_CURRENT);

ComponentName.java