1.build the android sources
2.Copy the classpath
copy “froyo/development/ide/eclipse/.classpath”
parse to “froyo/.classpath”
3.import the android project to eclipse
4.Delete the missing jars
delete “out/target/common/obj/JAVA_LIBRARIES/google-common_intermediates / javalib.jar”
delete “out/target/common/obj/JAVA_LIBRARIES/gsf-client_intermediates / javalib.jar”
5.Satisfy the missing files with links to these files
out/target/common/obj/ JAVA_LIBRARIES/framework_intermediates/classes.jar
out/target/common/obj/ JAVA_LIBRARIES/android-common_intermediates/classes.jar :contain calss com.android.common.Search
out/target/common/obj/ JAVA_LIBRARIES/core_intermediates/classes.jar :contain class dalvik.system.VMRuntime
out/target/common/obj/APPS/ContactsProvider_intermediates/classes.jar
out/target/common/obj/APPS/CalendarProvider_intermediates/classes.jar
6. run {Android SDK}/tools / emulator.exe
7 . run {Android SDK}/tools / ddms.bat
8. in eclipse, Run->Debug Configuration->Remote Java Application->New
9. set the break point in the source code , then you can debug as usual