我如何检查该应用是否可以移动到sd

如何解决我如何检查该应用是否可以移动到sd

|| 我想知道如何通过代码检查应用程序是否可移动到sd。我知道如何获取已安装的应用程序列表，它是否在SD卡上。 如果ApplicationInfo标志包含ApplicationInfo.FLAG_EXTERNAL_STORAGE，则它在sd卡上，但是如何检查该应用程序是否可移动到sd。     

解决方法

我的第一个猜测也是针对

InstalledAppDetails

活动的Android源代码。此活动显示“移至手机”和“移至SD卡”按钮。它具有称为ѭ1called的有趣功能：

private void initMoveButton() {
    String pkgName = mAppInfo.packageName;
    boolean dataOnly = false;
    ApplicationInfo info1 = null;
    PackageInfo pkgInfo = null;

    try {
        info1 = mPm.getApplicationInfo(pkgName,0);
        pkgInfo = mPm.getPackageInfo(mAppInfo.packageName,PackageManager.GET_UNINSTALLED_PACKAGES);
    } catch (NameNotFoundException e) {
    }
    dataOnly = (info1 == null) && (mAppInfo != null);
    boolean moveDisable = true;
    if (dataOnly) {
        mMoveAppButton.setText(R.string.move_app);
    } else if ((mAppInfo.flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) != 0) {
        mMoveAppButton.setText(R.string.move_app_to_internal);
        // Always let apps move to internal storage from sdcard.
        moveDisable = false;
    } else {
        mMoveAppButton.setText(R.string.move_app_to_sdcard);
        if ((mAppInfo.flags & ApplicationInfo.FLAG_FORWARD_LOCK) == 0 &&
                (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0 &&
                pkgInfo != null) {
            if (pkgInfo.installLocation == PackageInfo.INSTALL_LOCATION_PREFER_EXTERNAL ||
                    pkgInfo.installLocation == PackageInfo.INSTALL_LOCATION_AUTO) {
                moveDisable = false;
            } else if (pkgInfo.installLocation == PackageInfo.INSTALL_LOCATION_UNSPECIFIED) {
                IPackageManager ipm  = IPackageManager.Stub.asInterface(
                        ServiceManager.getService(\"package\"));
                int loc;
                try {
                    loc = ipm.getInstallLocation();
                } catch (RemoteException e) {
                    Log.e(TAG,\"Is Pakage Manager running?\");
                    return;
                }
                if (loc == PackageHelper.APP_INSTALL_EXTERNAL) {
                    // For apps with no preference and the default value set
                    // to install on sdcard.
                    moveDisable = false;
                }
            }
        }
    }
    if (moveDisable) {
        mMoveAppButton.setEnabled(false);
    } else {
        mMoveAppButton.setOnClickListener(this);
        mMoveAppButton.setEnabled(true);
    }
}

尽管并非所有此函数中使用的类都可以通过公共API获得。具体来说，“ 3”是内部类。     ,您可以按用户获取所有应用程序过滤器，然后尝试packetInfo设置过滤器\'INSTALL_LOCATION_INTERNAL_ONLY \'

    List<ApplicationInfo> packagesAll = pm.getInstalledApplications(PackageManager.GET_META_DATA);

    List<ApplicationInfo> packagesByUser = Stream.of(packagesAll)
        .filter((p -> (p.flags & ApplicationInfo.FLAG_SYSTEM) == 0))
        .filter((this::tryMoveSDPackage))
        .map(ApplicationInfo::new)
        .collect(Collectors.toList());

private boolean tryMoveSDPackage(ApplicationInfo applicationInfo) {
    try {
        PackageInfo packageInfo = getPackageManager().getPackageInfo(applicationInfo.packageName,0);
        if (packageInfo.installLocation == PackageInfo.INSTALL_LOCATION_AUTO) {
            //Log.i(TAG,\"INSTALL_LOCATION_AUTO\");
            return true;
        } else if (packageInfo.installLocation == PackageInfo.INSTALL_LOCATION_PREFER_EXTERNAL) {
            //Log.d(TAG,\"INSTALL_LOCATION_PREFER_EXTERNAL\");
            return true;
        } else {
            //Log.w(TAG,\"INSTALL_LOCATION_INTERNAL_ONLY\");
            return false;
        }

    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return false;
    }
}