橫豎屏或摺疊屏切換自動保存和恢復數據

屏幕橫豎屏切換或摺疊屏切換時，activity會銷燬而後重建，後面賦值的變量會爲null。 須要onSaveInstanceState保存數據，onCreate 恢復數據。 使用android-state或icepick能使用註解自動保存和恢復，不用每一個變量put 和get。

android-state和icepick

android-state

api 'com.evernote:android-state:1.4.1'
kapt 'com.evernote:android-state-processor:1.4.1'
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BaseActivity

abstract class BaseActivity() : AppCompatActivity(){
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        StateSaver.restoreInstanceState(this, savedInstanceState)
    }
    public override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        StateSaver.saveInstanceState(this, outState)
    }
}
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使用

class TestActivity : BaseActivity() {
    @State
    var username: String? = null
}
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icepick

implementation 'frankiesardo:icepick:3.2.0'
kapt 'frankiesardo:icepick-processor:3.2.0'
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BaseActivity

abstract class BaseActivity() : AppCompatActivity(){
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        Icepick.restoreInstanceState(this, savedInstanceState)
    }
    public override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
       Icepick.saveInstanceState(this, outState)
    }
}
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使用

class TestActivity : BaseActivity() {
    @State
    @JvmField
    var username: String? = null
}
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