1、檔案路徑：alps/packages/apps/Settings/src/com/android/settings/applications/InstalledAppDetailsalps/packages/apps/Settings/src/com/android/settings/applications/InstalledAppDetails.java

2、方法handleDisableable(Button button);：

private boolean handleDisableable(Button button) {
	boolean disableable = false;
    // Try to prevent the user from bricking their phone
    // by not allowing disabling of apps signed with the
    // system cert and any launcher app in the system.
    if (mHomePackages.contains(mAppEntry.info.packageName)
		|| Utils.isSystemPackage(mPm, mPackageInfo)) {
        // Disable button for core system applications.
        button.setText(R.string.disable_text);
    } /// M : update uninstall button base on disableAppList {@
    else if (UtilsExt.disableAppList != null
		&& UtilsExt.disableAppList.contains(mAppEntry.info.packageName)) {
        // set some special app cannot disable
        Log.d(TAG, "mDisableAppsList contains :" + mAppEntry.info.packageName);
        button.setText(R.string.disable_text);
        disableable = false;
    } /// @}
    //Redmine109402 wuxuhua add for UserManual 2017-10-24 begin
    else if("com.sagereal.app.usermanual".equals(mAppEntry.info.packageName)){
		button.setText(R.string.disable_text);
        disableable = false;
    }
    //Redmine109402 wuxuhua add for UserManual 2017-10-24 end
    else if (mAppEntry.info.enabled && !isDisabledUntilUsed()) {
		button.setText(R.string.disable_text);
        disableable = true;
    } else {
        button.setText(R.string.enable_text);
        disableable = true;
    }
    return disableable;
}
 

3、即可讓app Disable按鈕永遠不可點選