1. Disable Package

PackageManager pm = context.getPackageManager();
pm.setApplicationEnabledSetting("com.qualcomm.location", PackageManager.COMPONENT_ENABLED_STATE_DISABLED, 0);

需要system权限以及添加

<uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE" />

2. Disable Component

PackageManager pm = context.getPackageManager();
ComponentName name = new ComponentName(context, CryptKeeper.class);
pm.setComponentEnabledSetting(name, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,  PackageManager.DONT_KILL_APP);

关于第二个参数的介绍：

/**
     * Flag for {@link #setApplicationEnabledSetting(String, int, int)}
     * and {@link #setComponentEnabledSetting(ComponentName, int, int)}: This
     * component or application is in its default enabled state (as specified
     * in its manifest).
     */
    public static final int COMPONENT_ENABLED_STATE_DEFAULT = 0;

    /**
     * Flag for {@link #setApplicationEnabledSetting(String, int, int)}
     * and {@link #setComponentEnabledSetting(ComponentName, int, int)}: This
     * component or application has been explictily enabled, regardless of
     * what it has specified in its manifest.
     */
    public static final int COMPONENT_ENABLED_STATE_ENABLED = 1;

    /**
     * Flag for {@link #setApplicationEnabledSetting(String, int, int)}
     * and {@link #setComponentEnabledSetting(ComponentName, int, int)}: This
     * component or application has been explicitly disabled, regardless of
     * what it has specified in its manifest.
     */
    public static final int COMPONENT_ENABLED_STATE_DISABLED = 2;

    /**
     * Flag for {@link #setApplicationEnabledSetting(String, int, int)} only: The
     * user has explicitly disabled the application, regardless of what it has
     * specified in its manifest.  Because this is due to the user's request,
     * they may re-enable it if desired through the appropriate system UI.  This
     * option currently <strong>can not</strong> be used with
     * {@link #setComponentEnabledSetting(ComponentName, int, int)}.
     */
    public static final int COMPONENT_ENABLED_STATE_DISABLED_USER = 3;

View Code

在frameworks/base/services/java/com/android/server/pm/PackageManagerService.java中有下面一段代码：

        // Limit who can change which apps
        if (!UserHandle.isSameApp(callingUid, pkgSetting.appId)) {
            // Don't allow apps that don't have permission to modify other apps
            if (!allowedByPermission
                    || filterAppAccessLPr(pkgSetting, callingUid, userId)) {
                throw new SecurityException(
                        "Attempt to change component state; "
                        + "pid=" + Binder.getCallingPid()
                        + ", uid=" + callingUid
                        + (className == null
                                ? ", package=" + packageName
                                : ", component=" + packageName + "/" + className));
            }

可以看出Android不让其他app来禁用另外的app。

想让你在同一个app里操作这个应用的禁用，所以会根据你的uid，判断是不是一个app在做这个操作。
因此，可以看出，系统想让自身来管理自己，所以最好是在自己app中来管理自己被disable。

3. 在 PackageManagerService 中跳过app的安装

PackageManagerService会在第一次启动时遍历/system/app/, /system/priv-app/, system/framework/, /vendor/app/等目录里面是否有需要安装的app，如果有jar或者apk就会把app安装被加在一个list里面。

这样如果我们如果不想app被安装，可以根据app name来跳过当前app的安装。

遍历和安装app的方法在

private void scanDirLI(File dir, int parseFlags, int scanFlags, long currentTime) {

实际安装的方法为：

parallelPackageParser.submit(file, parseFlags);

所以只需要在遍历到不希望装的app时候，continue跳出这个循环，不去走parallelPackageParser.submit()， app就不会被安装

即在这句前面加：

if(file.getName().contains("ABCDE")) {
    Log.i("Kunkka","Skip ABCDE");
    continue;
}