Handheld device and method for unlocking the handheld device

1. A method for unlocking a handheld device with a touch screen, comprising:

storing login information of a social network in a storage system of the handheld device;

accessing the social network by the login information stored in the storage system;

acquiring information of a plurality of friends from the social network to store in the storage system, wherein information of one of the plurality of friends comprises a primary key and a secondary key;

selecting a first amount of the primary key and a second amount of the secondary key from the storage system;

creating an unlocking interface on the touch screen according to the second amount of the secondary key and a question based on the first amount of the primary key;

detecting an input event of a user on the unlocking interface;

determining whether the input event corresponds to an answer linked with the question; and

transitioning the handheld device from a lock state to an unlock state upon the condition that the input event corresponds to the answer.

2. The method as claimed in claim 1 , wherein the primary key is selected from the group comprising a photo and a video uploaded by the one of the plurality of friends, the name, messages and description related to the one of the plurality of friends, and the secondary key is selected from the group at least comprising an image of the one of the plurality of friends.

3. The method as claimed in claim 1 , wherein the first amount is one and the second is more than one, and selecting the first amount of the primary key and the second amount of the secondary key from the storage system comprises:

selecting one primary key of the one of the plurality of friends; and

selecting one secondary key related to the one of the plurality of friends and at least one secondary key unrelated to the one of the plurality of friends.

4. The method as claimed in claim 3 , wherein the one primary key is the name of the one of the plurality of friends, and the more than one secondary key comprises one image related and at least one image unrelated to the one of the plurality of friends, and the question refers to selecting one of the images corresponding to the name of the one of the plurality of friends, and when the selected image corresponds to the name, the handheld device determines that the input event corresponds to the answer linked with the question.

5. The method as claimed in claim 3 , the one primary key is a photo uploaded by the one of the plurality of friends, and the more than one secondary key comprises images of the one of the plurality of friends and other friends in the social network, and the question refers to selecting an image corresponding to the photo of the one of the plurality of friends, and when the selected image corresponds to the photo of the one of the plurality of friends, the handheld device determines that the input event corresponds to the answer linked with the question.

6. The method as claimed in claim 3 , wherein the one primary key is the name of the one of the plurality of friends, and the more than one secondary key comprises group photos of the one of the plurality of friends and other friends in the social network, and the question refers to selecting an image corresponding to the name of the one of the plurality of friends from one of the group photos, and when the selected image corresponds to the name, the handheld device determines that the input event corresponds to the answer linked with the question.

7. The method as claimed in claim 1 , wherein both the first amount and the second mount are more than one, and selecting the first amount of the primary key and the second amount of the secondary key from the storage system further comprises:

selecting more than one primary key of more than one friend stored in the storage system; and

selecting more than one secondary key corresponds to the more than one friend.

8. The method as claimed in claim 7 , wherein the more than one primary key comprises the names of X, Y and Z, and the more than one secondary key comprises images of X, Y and Z, and the question refers to clicking the images in the sequence of X, Y and Z, wherein when the user clicks the images in the sequence of X, Y and Z, the handheld device determines that the input event corresponds to the answer linked with the question.

9. The method as claimed in claim 1 , further comprising:

keeping the handheld device in the lock state if the input event of the user does not correspond to the answer.

10. The method as claimed in claim 9 , further comprising:

creating a new unlocking interface;

detecting a new input event of the user on the new unlocking interface;

determining whether the new input event corresponds to an answer linked with a question on the new unlocking interface; and

locking the handheld device if the user has failed over a predefined times.

11. A handheld device, comprising:

at least one processor;

a touch screen displaying an unlocking interface;

a storage system storing login information of a social network and one or more programs that are executed by the at least one processor, the one or more programs comprising:

an acquiring module, accessing the social network by the login information stored in the storage system and acquiring information of a plurality of friends in the social network, wherein information of one of the plurality of friends comprises a primary key and a secondary key;

an unlocking interface creating module, selecting a first amount of the primary key and a second amount of the secondary key from the storage system and creating the unlocking interface on the touch screen according to the second amount of the secondary key and a question based on the first amount of the primary key;

a detecting module, detecting an input event of a user on the unlocking interface;

a determining module, determining whether the input event corresponds to an answer linked with the question;

a transitioning module, transitioning the handheld device from a lock state to an unlock state upon the condition that the input event corresponds to the answer.

12. The handheld device as claimed in claim 11 , wherein the primary key is selected from the group comprising a photo and a video uploaded by the one of the plurality of friends, the name, messages and description related to the one of the plurality of friends, and the secondary key is selected from the group at least comprising an image of the one of the plurality of friends.

13. The handheld device as claimed in claim 11 , wherein the first amount is one and the second amount is more than one, and the unlocking interface creating module selects one primary key of the one of the plurality of friends and selects one secondary key related to the one of the plurality of friends and at least one secondary key unrelated to the one of the plurality of friends.

14. The handheld device as claimed in claim 11 , wherein both the first amount and the second mount are more than one, and the unlocking interface creating module selects more than one primary key of more than one friend stored in the storage system and selects more than one secondary key corresponds to the more than one friend.

15. The handheld device as claimed in claim 11 , wherein the transitioning module keeps the handheld device in the lock state if the determining module determines that the input event of the user does not correspond to the answer.

16. The handheld device as claimed in claim 15 , wherein the unlocking interface creating module creates a new unlocking interface, and the transitioning module locks the handheld device if the determining module determines that the user has failed over a predefined times.