Android带结果的启动Activity推荐使用registerForActivityResult

startActivityForResult过期

一直都是这样启动一个带返回结果的Activity

val intent = Intent(this, VideoPlaybackListPPCSActivity::class.java).apply {
    this.putExtra("data",111)
}

// 此方法已过期
// Deprecated
// use registerForActivityResult(ActivityResultContract, ActivityResultCallback) passing in a androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult object for the ActivityResultContract.
startActivityForResult(intent,10090)

使用registerForActivityResult跳转

//初始化不能在按键事件等地方执行，建议在onCreate执行
val launcher = registerForActivityResult(object: ActivityResultContract<String,String>(){
    override fun createIntent(context: Context, input: String?): Intent {

        return Intent(this@VideoPlayerPPCSActivity, VideoPlaybackListPPCSActivity::class.java).apply{
            intent.extras?.let { ext ->
                ext.putInt("session",remoteCamera.getSession())
                this.putExtras(ext)
            }
        }
    }
    override fun parseResult(resultCode: Int, intent: Intent?): String {
        
        //解析Intent中的数据，返回给onActivityResult
        //这里不需要数据
        return "ok"
    }
},object: ActivityResultCallback<String>{
    override fun onActivityResult(result: String?) {
        
        //拿到数据
    }
})


// 需要跳转时，这样执行 
val intent = Intent(this, VideoPlaybackListPPCSActivity::class.java).apply {
    this.putExtra("data",111)
}
launcher.launch(intent)

简化

Deprecated
use registerForActivityResult(ActivityResultContract, ActivityResultCallback) passing in a androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult object for the ActivityResultContract.

如果仅仅只跳转Activity，可以用ActivityResultContracts.StartActivityForResult简化为以下代码：

// 注册
private lateinit var launcher: ActivityResultLauncher<Intent>
launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){
    // lamda 简化了ActivityResultCallback
    // 这里处理结果
}

....
//启动Activity
launcher.launch(intent)