网址2

https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=constraintlayout%20button&oq=constraint.constraintlayout%2520button&rsv_pq=87acef540004770e&rsv_t=67e7ZGgXHQfqTU01jXBCwPBW%2Bx2qc5FUSZEo9iXI3xBxCB7sQjcUPjG21Yk&rqlang=cn&rsv_enter=1&inputT=240&rsv_sug3=37&rsv_sug2=0&rsv_sug4=240&rsv_sug=1

http://www.jianshu.com/p/32a0a6e0a98a

http://blog.csdn.net/android_zhengyongbo/article/details/65630103

http://www.jianshu.com/p/38ee0aa654a8

https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=instant%20run%20requires%20%27Tools%27&oq=instant%2520run%2520requires%2520tools&rsv_pq=91f21e080004b89a&rsv_t=b19fDD4VEfHcM%2BwfERlITg1RN92eIe37e37Q9CUqAHWsZvtU4Nt%2BzM736Do&rqlang=cn&rsv_enter=1&inputT=5491&rsv_sug3=37&rsv_sug1=32&rsv_sug7=100&rsv_sug2=0&rsv_sug4=6043

http://blog.csdn.net/zhuwentao2150/article/details/51104843

https://www.baidu.com/s?ie=utf-8&f=3&rsv_bp=0&rsv_idx=1&tn=baidu&wd=asynctask%E5%81%9C%E6%AD%A2&rsv_pq=c453145a00060d95&rsv_t=cdfbpQ6Y9Xp9BF%2BbJZNjGtHUgiqHA0ZoPBWwFBt4TJ%2F07iNOpAYJvOl6hks&rqlang=cn&rsv_enter=1&rsv_sug3=7&rsv_sug1=3&rsv_sug7=100&rsv_sug2=0&prefixsug=AsyncTask&rsp=3&inputT=5295&rsv_sug4=5296&rsv_sug=1

http://bbs.51cto.com/thread-835748-1.html

http://blog.csdn.net/cuiweijie3/article/details/8664001

https://www.cnblogs.com/xqxacm/p/5227159.html

http://blog.csdn.net/hu285279904/article/details/43640477

https://www.cnblogs.com/hxb2016/p/6143648.html

https://www.baidu.com/s?ie=utf-8&f=3&rsv_bp=1&rsv_idx=1&tn=baidu&wd=integer%20primary%20key%20autoincrement&oq=%25E6%25AC%25A1%25E6%2595%25B0%2520%25E8%258B%25B1%25E6%2596%2587&rsv_pq=fcd20c0a0007475f&rsv_t=ac21RV5oUil33pk5BNuoxURkqkOalI4ofo8etSIbp%2FmaE8SxSUqI29IHs9k&rqlang=cn&rsv_enter=1&inputT=1810&rsv_n=2&rsv_sug3=6&bs=%E6%AC%A1%E6%95%B0%20%E8%8B%B1%E6%96%87

https://www.cnblogs.com/peida/archive/2008/11/29/1343832.html

https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=onUpgrade(SQLiteDatabase%20sqLiteDatabase%2C%20int%20i%2C%20int%20i1)&rsv_pq=ff93f2020008047b&rsv_t=5a31a3nnyorm%2BxTCYq2cKYkFXSRBJ866Qb%2BFZHLt%2FGNKhCGA3sVSEe1mPNA&rqlang=cn&rsv_enter=1&rsv_n=2&rsv_sug3=1

https://www.cnblogs.com/sunrise-hs/p/5668762.html

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http://bbs.csdn.net/topics/391999055