android achieve simple stopwatch can record qualifying, and on a time difference

stopwatch
.........\.idea
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.........\...\..........\.........\...\.......\.........\BuildConfig.class
.........\...\..........\.........\...\.......\.........\MainActivity$StopWatchTask.class
.........\...\..........\.........\...\.......\.........\MainActivity.class
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.........\...\..........\.........\...\.......\.........\R.class
.........\...\..........\.........\...\.......\.........\Record.class
.........\...\..........\.........\stopwatch.apk
.........\...\..........\.........\stopwatch.unaligned.apk
.........\proguard-project.txt
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.........\res
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.........\...\...\.......\stopwatch
.........\...\...\.......\.........\MainActivity.java
.........\...\...\.......\.........\MyLvAdapter.java
.........\...\...\.......\.........\Record.java
.........\stopwatch.iml

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