Android开发 registerForActivityResult 传值和申请动态权限
前言
startActivityForResult() 被弃用，现在可以通过registerForActivityResult 进行Activity之间的传值和获取申请动态权限结果
Activity向上传值
MainActivity
package com.zh.demo
import android.content.Intent
import android.os.Bundle
import android.util.Log
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import com.zh.demo.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val activityResult =
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
if (it.resultCode == RESULT_OK) {
Log.e("zh", "返回数据 = ${it.data?.getStringExtra("data")}")
}
}
binding.jump.setOnClickListener {
activityResult.launch(Intent(this, DemoActivity::class.java))
}
}
}
DemoActivity
package com.zh.demo
import android.content.Intent
import android.os.Bundle
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import com.zh.demo.databinding.ActivityDemoBinding
class DemoActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
enableEdgeToEdge()
val binding = ActivityDemoBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.back.setOnClickListener {
val intent = Intent()
intent.putExtra("data", "返回的数据")
setResult(RESULT_OK, intent)
finish()
}
}
}
申请动态权限
package com.zh.demo
import android.content.pm.PackageManager
import android.os.Bundle
import android.util.Log
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.lifecycleScope
import androidx.lifecycle.repeatOnLifecycle
import com.zh.demo.databinding.ActivityMainBinding
import kotlinx.coroutines.launch
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.permission.setOnClickListener {
requestPermission(listOf(android.Manifest.permission.CAMERA))
}
}
private val requestPermissionLauncher =
registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissionResults ->
if(permissionResults.isEmpty()){
Log.e("zh", "没有申请权限")
return@registerForActivityResult
}
permissionResults.values
var isGranted = true
for(it in permissionResults.keys){
Log.e("zh", "${it} >>>>> ${ContextCompat.checkSelfPermission(this@MainActivity, it)} ", )
if(ContextCompat.checkSelfPermission(this@MainActivity, it) != PackageManager.PERMISSION_GRANTED){
isGranted = false
}
if(shouldShowRequestPermissionRationale(it)){
/*
用户之前拒绝了权限请求但未选择“禁止后不再询问”：当用户之前拒绝了某个权限的请求，但没有选择“禁止后不再询问”的选项时，再次请求该权限时，
shouldShowRequestPermissionRationale将返回true，表示此时应该向用户展示一个解释为什么需要这个权限的对话框。
*/
Log.e("zh", "需要解释权限>>${it}")
} else {
/*
1.从未请求过该权限：如果应用从未向用户请求过某个权限，那么shouldShowRequestPermissionRationale将返回false，因为此时不需要向用户解释权限请求的原因。
2.用户已禁止权限且选择了“禁止后不再询问”：当用户之前拒绝了权限请求，并且选择了“禁止后不再询问”的选项，再次请求该权限时，shouldShowRequestPermissionRationale也会返回false，因为系统不会再次弹出权限请求对话框，而是需要用户手动在应用设置中开启权限。
3.用户已允许权限：如果用户已经允许了某个权限，那么再次请求该权限时，shouldShowRequestPermissionRationale也会返回false，因为权限已经被授予，无需再向用户解释。
*/
Log.e("zh", "无需解释权限>>${it}")
}
}
if(!isGranted){
Log.e("zh", "权限被拒绝")
return@registerForActivityResult
}
}
fun requestPermission(
permissions: List
) {
lifecycleScope.launch {
//repeatOnLifecycle 需要引入 implementation ("androidx.lifecycle:lifecycle-runtime-ktx:2.5.1")
repeatOnLifecycle(Lifecycle.State.CREATED) {
val notGrantedList = permissions.filter { ContextCompat.checkSelfPermission(this@MainActivity, it) != PackageManager.PERMISSION_GRANTED }
if(notGrantedList.isEmpty()){
Log.e("zh", "已经被全部授权了")
return@repeatOnLifecycle
}
requestPermissionLauncher.launch(notGrantedList.toTypedArray())
}
}
}
}
End