Yes, that's how SPV works. Bitcoinj is not designed as a full node.

On 12/26/2016 02:46 AM, cerz wrote:
> But the rescan takes a long time, bitcoinj need re-download all
> blockchain with SPV mode..
> 
> 2016-12-26 2:30 GMT+08:00 Andreas Schildbach <andr...@schildbach.de
> <mailto:andr...@schildbach.de>>:
> 
>     Sending coins without a wallet isn't really supported. You need to
>     import the key as you suggest, then you need to rescan the blockchain
>     for any payments to the key. After the scan the balance should be up to
>     date and you should be able to send any coins on the key.
> 
> 
>     On 12/25/2016 04:41 AM, Joseph wrote:
>     > Work on SPV mode.
>     >
>     > Q1:  How to get balance when I import a new private key which have some 
> btc?
>     >
>     > Wallet wallet = new Wallet(params);
>     > wallet.importKey(newKeys);
>     >
>     > wallet.getBalance(); // always 0 btc
>     >
>     > Q2: How to send btc without wallet?
>     > I have a private key whiche have some btc, and how to create
>     > a transaction and broadcast?
>     >
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