java - onActivityResult() 未调用(MapFragment)

Question

我正在尝试使我的 map 应用程序重定向到位置权限设置，一旦授予权限，就会再次重定向到应用程序。由于某种原因，我的 onActivityResult 在启动 Activity Intent 后甚至没有被调用。基本上发生的情况是，当我单击出现的 snackbar 操作按钮时，它会启动 settingsIntent 并将我很好地重定向到设置，但 Activity 不会进入结果状态并且 onActivityResult 从未被调用过有什么建议吗？

这是代码:

class MapsActivity : AppCompatActivity(), OnMapReadyCallback {

    private lateinit var mMap: GoogleMap

    private fun checkPermissions(): Boolean {
        //returns true if granted permission for location
        var checker = ActivityCompat.checkSelfPermission(
            applicationContext,
            android.Manifest.permission.ACCESS_COARSE_LOCATION
        ) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
            applicationContext,
            android.Manifest.permission.ACCESS_FINE_LOCATION
        ) == PackageManager.PERMISSION_GRANTED
        if (checker) {
            Log.d(TAG, "granted Permissions")
        } else {
            Log.d(TAG, "no Permissions granted")
        }
        return checker
    }

    @RequiresApi(Build.VERSION_CODES.M)
    private fun requestPermissions() {
        requestPermissions(
            arrayOf(
                android.Manifest.permission.ACCESS_COARSE_LOCATION,
                android.Manifest.permission.ACCESS_FINE_LOCATION
            ), PERMISSION_ID

        )

    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (!checkPermissions()) {
            Snackbar.make(
                    map.view!!,
                    "Please Enable Location Permission",
                    Snackbar.LENGTH_INDEFINITE
                ).setAction("Enable Location",
                    View.OnClickListener {
                        var settingsIntent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
                        startActivityForResult(settingsIntent, 1)


                    })
                .show()
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        Log.d(TAG, "Redirected to settings for Location Permissions ")
        if (resultCode == Activity.RESULT_OK) {
            if (checkPermissions()) {
                Log.d(TAG, "Permissions granted from settings")
                startActivity(Intent(this, MapsActivity::class.java))
            }
        }
        super.onActivityResult(requestCode, resultCode, data)
    }

    override fun onCreate(savedInstanceState: Bundle?) {

        Log.d(TAG, "onCreate called")
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)


    }

    @RequiresApi(Build.VERSION_CODES.M)
    override fun onMapReady(googleMap: GoogleMap) {
        Log.d(TAG, "omMapReady:starts")
        mMap = googleMap
        requestPermissions()

    }
}

list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.burgertracker">

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />


        <activity
            android:name=".MapsActivity"
            android:label="@string/title_activity_maps">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <action android:name="android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

        </activity>

    </application>

</manifest>

Answer 1

这对我有用，

MainActivity

import android.content.Intent
import android.os.Bundle
import android.provider.Settings
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        findViewById<TextView>(R.id.tv_click).setOnClickListener {
            val settingsIntent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
            startActivityForResult(settingsIntent, 1)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        Toast.makeText(this, "Hakuna Mattat", Toast.LENGTH_SHORT).show()
    }
}

activity_main_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_click"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.demointentapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

当我单击 TextView 时，我导航到“设置”页面上MainActivity当我从“设置”页面按回时，我看到 Toast留言Hakuna Mattat每次。