【Android跳转携带数据返回】 startActivityForResult 过时的替代方法（解释了跳转报错问题）

最新推荐文章于 2023-12-27 11:05:53 发布

weixin_43343144

最新推荐文章于 2023-12-27 11:05:53 发布

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文章标签： android android studio java

本文链接：https://blog.youkuaiyun.com/weixin_43343144/article/details/129420112

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参考：https://blog.youkuaiyun.com/NakajimaFN/article/details/126542605

package com.example.kotlingradletemplatefirst

import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.activity.result.ActivityResult
import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
import androidx.appcompat.app.AppCompatActivity


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button00)

        /**
         * 1、Android中旧版本的startActivityForResult替代方法为【registerForActivityResult】
         * 1、这个registerForActivityResult方法要写在Activity的onCreate方法里（在Activity创建的时候就要创建出来，不能等到使用的时候再创建，不然会报错LifecycleOwner com.xx.MainActivity@28b4e79 is attempting to register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.）。
         */
        val intentActivityResultLauncher = registerForActivityResult<Intent, ActivityResult>(
            StartActivityForResult()
        ) { result: ActivityResult ->
            if (result.resultCode == RESULT_OK) {
                println("data=${result.data?.getStringExtra("goto")}")
            }
        }

        button.setOnClickListener {
            val intent = Intent(this, GoToActivity::class.java)
            intent.putExtra("name", "ok")
            intentActivityResultLauncher.launch(intent)
        }
    }
}

package com.example.kotlingradletemplatefirst

import android.app.Activity
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity

class GoToActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.my_test)

        val button = findViewById<Button>(R.id.button01)
        button.text = "update"


        button.setOnClickListener {
            /**
             * 1、子activity返回数据进入主activity
             */
            val intentResult = Intent(this, MainActivity::class.java)
            intentResult.putExtra("goto", "goto")
            setResult(Activity.RESULT_OK, intentResult)
            finish()
        }
    }
}