onActivityResult

传统方式

单个页面跳转

主要有三个方法实现

• startActivityForResult(@RequiresPermission Intent intent, int requestCode)
• setResult(int resultCode, Intent data)
• onActivityResult(int requestCode, int resultCode, Intent data)

下面是简单例子
跳转MainActivity

目标SecondAcitivty

其中数据传递很简单,特别注意requestCode，resultCode不同的区分的区别

• requestCode：假设 MainActivity　button1 button2到SecondAcitivty,回来的在onActivityResult就需要

     判断是哪个button点击的
  

• resultCode: 假设MainActivity　button1跳转到SecondAcitivty, button2到ThirdActiivty,回来后onActivityResult

     就需要判断是哪个Activity回来的
  

  参考:http://blog.csdn.net/jiangwei0910410003/article/details/16983049

注意:onActivityResult方法用的算比较普遍，刚好有个困惑，回传数据时intent.putExtra("text",122); 使用 String couponId = data.getStringExtra("text"); 接收时为null,里面跳转和回传,存的值是int类型，获取string类型

Fragment接收onActivityResult

必须使用Fragment 的 startActivityForResult()*

public static void startForResult(Activity activity, Fragment fragment) {
       Intent intent = new Intent(activity, LoginActivity.class);
       fragment.startActivityForResult(intent, REQUEST_CODE_MINE_FRAGMENT);
 }

setResult(RESULT_OK, result); ,finish()后 onActivityResult 返回 resultCode

Activity嵌套Fragment,他们各自发起startActivityForResult发起数据请求

结论

• Fragment发起

  Fragment onActivityResult能接收。Activity onActivityResult能接收,但是requestCode不正确。

• Activity发起

  Fragment不能接收。 Activity onActivityResult能接收。

代码验证

FirstResultActivity

val requestCode = 1000
  override fun initView() {
      super.initView()
      val intent = Intent(this, SecondResultActivity::class.java)
      findViewById<View>(R.id.bt_activity).setOnClickListener {
          startActivityForResult(intent, requestCode)
          Timber.i("startActivityForResult $requestCode")
      }
  }

  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
      super.onActivityResult(requestCode, resultCode, data)
      Timber.d("onActivityResult resultCode $requestCode resultCode $resultCode  data  ${data?.getStringExtra(SecondResultActivity.sData)}")
  }

  private fun initFragment() {
      val ftn = supportFragmentManager.beginTransaction().replace(R.id.fl_content, newInstance("数据"))
      ftn.commit()
  }

ResultOkFragment

private val requestCode: Int = 2000
override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    val intent = Intent(context, SecondResultActivity::class.java)

    bt_fragment.setOnClickListener {
        startActivityForResult(intent, requestCode)
        Timber.d("startActivityForResult $requestCode")
    }
}


override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    Timber.d("onActivityResult resultCode $requestCode resultCode $resultCode  data 			${data?.getStringExtra(SecondResultActivity.sData)}")
}

SecondResultActivity

setResult(21, new Intent().putExtra(sData, "我要回调啦!!!"));
finish();

• Activity发起

  I/FirstResultActivity$initView: startActivityForResult 1000
  D/FirstResultActivity: onActivityResult resultCode 1000 resultCode 21  data  我要回调啦!!!

• Fragment发起

  D/ResultOkFragment$onActivityCreated: startActivityForResult 2000
  D/ResultOkFragment: onActivityResult resultCode 2000 resultCode 21  data 我要回调啦!!!
  D/FirstResultActivity: onActivityResult resultCode 329680 resultCode 21  data  我要回调啦!!!

跳转多个页面 回来

中间页面不能finish，也需要在onActivityResult方法内部 起到桥梁作用，回传数据

http://blog.csdn.net/lanyachuanshu/article/details/52172143
https://developer.android.com/training/basics/intents/result.html

http://45.77.222.97:3000/root/MineUtils/src/master/app/src/main/java/com/jonzhou/mineutils/result/FirstResultActivity.java

https://mp.weixin.qq.com/s?__biz=MzAxMTI4MTkwNQ==&mid=2650826252&idx=1&sn=9ec620d630706c9f8de328e87bb8a0f1&chksm=80b7b292b

ActivityResultContract新方式

https://mp.weixin.qq.com/s/o2_2DeAIcJGYSvm2WlhUxg

回调作用

class PlayStoreActivity : AppCompatActivity() {
	binding.opengoogle.setOnClickListener {
        intent.action = "com.google.android.payments.standard.TOPUP_V2"
        intent.putExtra("gspTopUpRequest", resources.getString(R.string.secret_key))
        resultLauncher.launch(intent)
    }



 var resultLauncher =
    registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
        when (result.resultCode) {
            Activity.RESULT_OK -> Toast.makeText(this, "succuss", Toast.LENGTH_SHORT).show()
            0 -> Toast.makeText(this, "user topup Abandon", Toast.LENGTH_SHORT).show()
            1 -> Toast.makeText(this, "topup Failed", Toast.LENGTH_SHORT).show()
        }
    }
}

class GoogleTopUpActivity : BaseActivity() {
    val biding by lazy { ActivityGoogleTopUpBinding.inflate(layoutInflater) }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(biding.root)
        biding.btPage.setOnClickListener {
            onTopUpAbandon()
        }
        biding.btGoReload.setOnClickListener {
            startActivity(Intent(this, ReloadActivity::class.java))
            finish()
        }
    }

class ReloadActivity : AppCompatActivity() {
    val biding by lazy { ActivityReloadBinding.inflate(layoutInflater) }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(biding.root)
        biding.btReloadPage.setOnClickListener {
            finish()
        }
    }
}

PlayStoreActivity -> GoogleTopUpActivity -> ReloadActivity

GoogleTopUpActivity的时候已经关闭了,ReloadActivity 关闭后回到PlayStoreActivity还是会有回调