Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 30% duplication:
- 8,163 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 2,495 duplicated lines
- 123 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
SwipeRefreshLayoutBasic (96%)
--> SwipeRefreshMultipleViews (91%)
1322
11 file pairs
details...
RecyclerView (69%)
--> SwipeRefreshLayoutBasic (34%)
468
7 file pairs
details...
RecyclerView (69%)
--> SwipeRefreshMultipleViews (32%)
468
7 file pairs
details...
MultiWindowPlayground (50%)
--> RecyclerView (48%)
328
6 file pairs
details...
MultiWindowPlayground (50%)
--> SwipeRefreshLayoutBasic (23%)
328
6 file pairs
details...
MultiWindowPlayground (50%)
--> SwipeRefreshMultipleViews (22%)
328
6 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| SwipeRefreshLayoutBasic (96%) --> SwipeRefreshMultipleViews (91%) |
1322 | 11 file pairs | details... |
| RecyclerView (69%) --> SwipeRefreshLayoutBasic (34%) |
468 | 7 file pairs | details... |
| RecyclerView (69%) --> SwipeRefreshMultipleViews (32%) |
468 | 7 file pairs | details... |
| MultiWindowPlayground (50%) --> RecyclerView (48%) |
328 | 6 file pairs | details... |
| MultiWindowPlayground (50%) --> SwipeRefreshLayoutBasic (23%) |
328 | 6 file pairs | details... |
| MultiWindowPlayground (50%) --> SwipeRefreshMultipleViews (22%) |
328 | 6 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 145 | x 2 | SwipeRefreshLayoutBasic/...ndroid/common/dummydataSwipeRefreshMultipleView...ndroid/common/dummydata |  Cheeses.javaCheeses.java |
26:184 (100%)26:184 (100%) | view |
| 123 | x 2 | SwipeRefreshLayoutBasic/...ple/android/common/viewSwipeRefreshMultipleView...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
48:308 (100%)48:308 (100%) | view |
| 110 | x 2 | SwipeRefreshLayoutBasic/...ple/android/common/viewSwipeRefreshMultipleView...ple/android/common/view | SlidingTabStrip.javaSlidingTabStrip.java |
29:205 (100%)29:205 (100%) | view |
| 60 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/logger | LogView.javaLogView.java |
25:141 (100%)25:141 (100%) | view |
| 60 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | LogView.javaLogView.java |
25:141 (100%)25:141 (100%) | view |
| 60 | x 2 | SwipeRefreshLayoutBasic/...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | LogView.javaLogView.java |
25:141 (100%)25:141 (100%) | view |
| 46 | x 2 | MultiWindowPlayground/Ap...e/android/common/loggerRecyclerView/Application...e/android/common/logger | Log.javaLog.java |
26:236 (100%)26:234 (100%) | view |
| 46 | x 2 | SwipeRefreshLayoutBasic/...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | Log.javaLog.java |
26:234 (100%)26:234 (100%) | view |
| 46 | x 2 | MultiWindowPlayground/Ap...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/logger | Log.javaLog.java |
26:236 (100%)26:234 (100%) | view |
| 46 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/logger | Log.javaLog.java |
26:234 (100%)26:234 (100%) | view |
| 46 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | Log.javaLog.java |
26:234 (100%)26:234 (100%) | view |
| 46 | x 2 | MultiWindowPlayground/Ap...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | Log.javaLog.java |
26:236 (100%)26:234 (100%) | view |
| 42 | x 2 | SwipeRefreshLayoutBasic/...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | LogFragment.javaLogFragment.java |
49:107 (100%)49:107 (100%) | view |
| 42 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/logger | LogFragment.javaLogFragment.java |
49:107 (100%)49:107 (100%) | view |
| 42 | x 2 | RecyclerView/Application...e/android/common/loggerSwipeRefreshMultipleView...e/android/common/logger | LogFragment.javaLogFragment.java |
49:107 (100%)49:107 (100%) | view |
| 37 | x 2 | ConstraintLayoutExamples...utexample/histogramdemoConstraintLayoutExamples...utexample/histogramdemo |  HistogramWidget.ktNonAnimatingHistogramWidget.kt |
196:250 (29%)134:188 (43%) | view |
| 36 | x 2 | ConstraintLayoutExamples...utexample/fragmentsdemoConstraintLayoutExamples...utexample/fragmentsdemo | FragmentExample2Activity.ktFragmentExampleActivity.kt |
53:106 (65%)53:103 (64%) | view |
| 35 | x 2 | RecyclerView/Application...le/android/recyclerviewSwipeRefreshMultipleView...iperefreshmultipleviews | MainActivity.javaMainActivity.java |
54:108 (77%)54:108 (77%) | view |
| 35 | x 2 | SwipeRefreshLayoutBasic/...swiperefreshlayoutbasicSwipeRefreshMultipleView...iperefreshmultipleviews | MainActivity.javaMainActivity.java |
54:108 (77%)54:108 (77%) | view |
| 35 | x 2 | RecyclerView/Application...le/android/recyclerviewSwipeRefreshLayoutBasic/...swiperefreshlayoutbasic | MainActivity.javaMainActivity.java |
54:108 (77%)54:108 (77%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 43 | x 3 | SwipeRefreshMultipleView...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/loggerRecyclerView/Application...e/android/common/logger | LogView.javaLogView.javaLogView.java |
48:106 48:106 48:106 | view |
| 35 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabStrip.javaSlidingTabStrip.java |
117:163 117:163 | view |
| 22 | x 3 | SwipeRefreshMultipleView...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/loggerRecyclerView/Application...e/android/common/logger | LogFragment.javaLogFragment.javaLogFragment.java |
56:83 56:83 56:83 | view |
| 21 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
197:225 197:225 | view |
| 18 | x 2 | ConstraintLayoutExamples...utexample/fragmentsdemoConstraintLayoutExamples...utexample/fragmentsdemo | FragmentExampleActivity.ktFragmentExample2Activity.kt |
88:106 91:109 | view |
| 17 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
171:195 171:195 | view |
| 15 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
259:277 259:277 | view |
| 14 | x 3 | SwipeRefreshMultipleView...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/loggerRecyclerView/Application...e/android/common/logger | LogFragment.javaLogFragment.javaLogFragment.java |
86:104 86:104 86:104 | view |
| 14 | x 3 | SwipeRefreshMultipleView...iperefreshmultipleviewsSwipeRefreshLayoutBasic/...swiperefreshlayoutbasicRecyclerView/Application...le/android/recyclerview | MainActivity.javaMainActivity.javaMainActivity.java |
75:89 75:89 75:89 | view |
| 13 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
236:253 236:253 | view |
| 12 | x 4 | SwipeRefreshMultipleView...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/loggerRecyclerView/Application...e/android/common/loggerMultiWindowPlayground/Ap...e/android/common/logger | LogWrapper.javaLogWrapper.javaLogWrapper.javaLogWrapper.java |
52:74 52:74 52:74 54:76 | view |
| 11 | x 2 | ConstraintLayoutExamples...utexample/fragmentsdemoConstraintLayoutExamples...utexample/fragmentsdemo | FragmentExampleActivity.ktFragmentExample2Activity.kt |
75:86 75:89 | view |
| 9 | x 3 | SwipeRefreshMultipleView...iperefreshmultipleviewsSwipeRefreshLayoutBasic/...swiperefreshlayoutbasicRecyclerView/Application...le/android/recyclerview | MainActivity.javaMainActivity.javaMainActivity.java |
93:109 93:109 93:109 | view |
| 8 | x 4 | SwipeRefreshMultipleView...e/android/common/loggerSwipeRefreshLayoutBasic/...e/android/common/loggerRecyclerView/Application...e/android/common/loggerMultiWindowPlayground/Ap...e/android/common/logger | LogView.javaLogView.javaLogView.javaLogView.java |
125:134 125:134 125:134 129:138 | view |
| 8 | x 2 | SwipeRefreshMultipleView...ndroid/common/dummydataSwipeRefreshLayoutBasic/...ndroid/common/dummydata | Cheeses.javaCheeses.java |
173:185 173:185 | view |
| 8 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
289:298 289:298 | view |
| 7 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
90:102 90:102 | view |
| 7 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
157:165 157:165 | view |
| 7 | x 2 | SwipeRefreshMultipleView...ple/android/common/viewSwipeRefreshLayoutBasic/...ple/android/common/view | SlidingTabLayout.javaSlidingTabLayout.java |
304:311 304:311 | view |
| 7 | x 2 | SwipeRefreshMultipleView...iperefreshmultipleviewsSwipeRefreshLayoutBasic/...swiperefreshlayoutbasic | SwipeRefreshMultipleViewsFragment.javaSwipeRefreshLayoutBasicFragment.java |
208:219 191:202 | view |