Android 不写shape和selector如何实现它们的效果

1.导入依赖  

compile 'com.noober.backgorund:core:1.0.5'

2.在baseActivity的

super.onCreate(savedInstanceState);

方法上面添加一行代码

BackgroundLibrary.inject(this);

3.可以在代码中用了，例如

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