dpm命令分析

1, 概述

dpm主要是和DevicePolicyManage进行交互,通过用户授权应用设备管理权限后,可以在代码修改很多系统设置。

2, dpm命令

命令格式：

dpm<command>

 

命令列表：

命令

功能

实现方法

set-active-admin

激活

mDevicePolicyManager.setActiveAdmin

set-device-owner

设置设备权限

setDeviceOwner

set-profile-owner

文件权限

setProfileOwner

 

3, 详细流程

所有adb命令的dpm方法最后都会通过Dpm.java执行,然后通过跨进程调用DevicePolicyManager的方法完成。

  流程很简单,在此就不论述了,仅给出Dpm.java文件

  public final class Dpm extends BaseCommand {    /**     * Command-line entry point.     *     * @param args The command-line arguments     */    public static void main(String[] args) {      (new Dpm()).run(args);    }    private static final String COMMAND_SET_ACTIVE_ADMIN = "set-active-admin";    private static final String COMMAND_SET_DEVICE_OWNER = "set-device-owner";    private static final String COMMAND_SET_PROFILE_OWNER = "set-profile-owner";    private IDevicePolicyManager mDevicePolicyManager;    private int mUserId = UserHandle.USER_OWNER;    private ComponentName mComponent = null;    @Override    public void onShowUsage(PrintStream out) {        out.println(                "usage: dpm [subcommand] [options]\n" +                "usage: dpm set-active-admin [ --user <USER_ID> ] <COMPONENT>\n" +                "usage: dpm set-device-owner <COMPONENT>\n" +                "usage: dpm set-profile-owner [ --user <USER_ID> ] <COMPONENT>\n" +                "\n" +                "dpm set-active-admin: Sets the given component as active admin" +                " for an existing user.\n" +                "\n" +                "dpm set-device-owner: Sets the given component as active admin, and its\n" +                "  package as device owner.\n" +                "\n" +                "dpm set-profile-owner: Sets the given component as active admin and profile" +                "  owner for an existing user.\n");    }    @Override    public void onRun() throws Exception {        mDevicePolicyManager = IDevicePolicyManager.Stub.asInterface(                ServiceManager.getService(Context.DEVICE_POLICY_SERVICE));        if (mDevicePolicyManager == null) {            showError("Error: Could not access the Device Policy Manager. Is the system running?");            return;        }        String command = nextArgRequired();        switch (command) {            case COMMAND_SET_ACTIVE_ADMIN:                runSetActiveAdmin();                break;            case COMMAND_SET_DEVICE_OWNER:                runSetDeviceOwner();                break;            case COMMAND_SET_PROFILE_OWNER:                runSetProfileOwner();                break;            default:                throw new IllegalArgumentException ("unknown command '" + command + "'");        }    }    private void parseArgs(boolean canHaveUser) {        String nextArg = nextArgRequired();        if (canHaveUser && "--user".equals(nextArg)) {            mUserId = parseInt(nextArgRequired());            nextArg = nextArgRequired();        }        mComponent = parseComponentName(nextArg);    }    private void runSetActiveAdmin() throws RemoteException {        parseArgs(true);        mDevicePolicyManager.setActiveAdmin(mComponent, true /*refreshing*/, mUserId);        System.out.println("Success: Active admin set to component " + mComponent.toShortString());    }    private void runSetDeviceOwner() throws RemoteException {        ComponentName component = parseComponentName(nextArgRequired());        mDevicePolicyManager.setActiveAdmin(component, true /*refreshing*/, UserHandle.USER_OWNER);        String packageName = component.getPackageName();        try {            if (!mDevicePolicyManager.setDeviceOwner(packageName, null /*ownerName*/)) {                throw new RuntimeException(                        "Can't set package " + packageName + " as device owner.");            }        } catch (Exception e) {            // Need to remove the admin that we just added.            mDevicePolicyManager.removeActiveAdmin(component, UserHandle.USER_OWNER);            throw e;        }        System.out.println("Success: Device owner set to package " + packageName);        System.out.println("Active admin set to component " + component.toShortString());    }    private void runSetProfileOwner() throws RemoteException {        parseArgs(true);        mDevicePolicyManager.setActiveAdmin(mComponent, true /*refreshing*/, mUserId);        try {            if (!mDevicePolicyManager.setProfileOwner(mComponent, "" /*ownerName*/, mUserId)) {                throw new RuntimeException("Can't set component " + mComponent.toShortString() +                        " as profile owner for user " + mUserId);            }        } catch (Exception e) {            // Need to remove the admin that we just added.            mDevicePolicyManager.removeActiveAdmin(mComponent, mUserId);            throw e;        }        System.out.println("Success: Active admin and profile owner set to "                + mComponent.toShortString() + " for user " + mUserId);    }    private ComponentName parseComponentName(String component) {        ComponentName cn = ComponentName.unflattenFromString(component);        if (cn == null) {            throw new IllegalArgumentException ("Invalid component " + component);        }        return cn;    }    private int parseInt(String argument) {        try {            return Integer.parseInt(argument);        } catch (NumberFormatException e) {            throw new IllegalArgumentException ("Invalid integer argument '" + argument + "'", e);        }    }}