Android Fragment数据传递

Android Fragment数据传递

简介
在我们开发过程中，经常会遇到需要在fragment间进行数据传递（特别是引入Navigation导航后的单Activity、多Fragment模式），比如常见的在FragmentA更新FragmentB的状态、FragmentA拿到数据传递到FragmentB等等。从 Fragment 1.3.0-alpha04 开始，每个 FragmentManager 都会实现 FragmentResultOwner。这意味着 FragmentManager 可以充当 Fragment 结果的集中存储区，下面主要介绍最新的通过FragmentManager传递数据。

依赖
在app的build.gradle文件中添加依赖：

dependencies {
    ......
    
    implementation 'androidx.fragment:fragment:1.3.0-alpha07'
}

使用
① 同级Fragment间传递数据
发送方：FragmentB

class FragmentB : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_b, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        btn_send.setOnClickListener {
            val bundle = bundleOf(
                "data" to "我是FragmentB的数据",
                "isShow" to true
            )
            //发送数据
            parentFragmentManager.setFragmentResult("sendData",bundle)
        }
    }
    
}

接收方：FragmentA

class FragmentA : Fragment(){

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_a, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        //接收数据，requestKey必须和发送方的requestKey一致
        parentFragmentManager.setFragmentResultListener("sendData", this,
            FragmentResultListener { _, result ->
                if (result.getBoolean("isShow")) {
                    tv_a.text = result.getString("data")
                }
            })
    }

}

② 父级和子级Fragment间传递数据
发送方：FragmentB（父级）

class FragmentB : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_b, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        btn_send.setOnClickListener {
            val bundle = bundleOf(
                "data" to "我是FragmentB的数据",
                "isShow" to true
            )
            //发送数据 父级的parentFragmentManager变为childFragmentManager
            childFragmentManager.setFragmentResult("sendData",bundle)
        }
    }
    
}

接收方：FragmentA（子级）

class FragmentA : Fragment(){

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_a, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        //接收数据，requestKey必须和发送方的requestKey一致
        parentFragmentManager.setFragmentResultListener("sendData", this,
            FragmentResultListener { _, result ->
                if (result.getBoolean("isShow")) {
                    tv_a.text = result.getString("data")
                }
            })
    }

}