Import the camera application in the android source code to eclipse

The following error occurs: Import Android. Media. mediametadataretriever; Import Android. Media. exifinterface; Import Android. OS. systemproperties; Yes Many packages cannot be found. Why?

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Jinlking Level 1:	# 1st floor score: 0 Reply: 16:39:11 The SDK cannot be used without being opened.
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Yili_xie (Thousands of years old) Level 1:	# Second floor score: 10 Reply: 17:33:15 Many of the packages are system packages, which are provided in Android source, but are not provided by the SDK. Therefore, you will be prompted that the SDK cannot be found ~~ You See if you can import the jar package in source first ~~
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Omett (Winter is warm, summer is cold, and winter is warm) Level 1:	# Third floor score: 0 Reply: 15:01:44 Are all the missing packages available in the source code?
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Liujinrui (Feng. Lin. Hai) Level 1:	#4 floor score: 10 Reply: 13:31:17 Import Android. Media. mediametadataretriever; Import Android. OS. systemproperties; Both sdks have Import Android. Media. exifinterface; This class is in the camera source code.
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Freechinaren Level 1:	# Fifth floor score: 0 Reply: 09:39:35 After testing, I found the solution: ..... In the android SDK The data/layoutlib. jar file in the directory is required. Add layoutlib. jar to the current project. The method is as follows: Eclipse-> Project-> properties-> JAVA Build path-> libraries-> Add external jars... Then select layoutlib. Jar File. ... Good luck to you!
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Sun6223508 (Sun6223508) Level 1:

# Score on the 6th floor: 0 Reply: 16:18:14 Some APIs are not available