Kotlin安卓应用权限对话框不显示问题求助

API 探路者

2026-6-20

问题：Android权限请求对话框不弹出，直接显示Permission Denied Toast

我正在开发基于Kotlin的Android大学作业应用，需要将图片存入SQLite数据库。请求相册权限的代码运行时，权限对话框没弹出，直接显示“Permission denied”的Toast。

源代码

package com.example.final_project

import android.annotation.SuppressLint
import android.app.Activity
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.provider.MediaStore
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat


class ItemAdder : AppCompatActivity() {

    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.add_menu)

        val image_button = findViewById<Button>(R.id.image_button)

        image_button.setOnClickListener {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                if (checkSelfPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)==PackageManager.PERMISSION_DENIED){
                    val permissions = arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE)
                    ActivityCompat.requestPermissions(this, permissions, PERMISSION_CODE)
                } else{
                    chooseImageGallery()
                }
            }else{
                chooseImageGallery()
            }
        }
       
    companion object {
        private val IMAGE_CHOOSE = 1000;
        private val PERMISSION_CODE = 10301;
        private val REQUEST_CODE = 13
    }

    private fun chooseImageGallery() {
        // This is irrelevant to the problem
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when(requestCode){
            PERMISSION_CODE -
> {
                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    chooseImageGallery()
                }else{
                    Toast.makeText(this,"Permission denied", Toast.LENGTH_SHORT).show()
                }
            }
        }
    }

}

Android Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32"/>

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:theme="@style/Theme.AppCompat">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".ItemAdder"
            android:exported="false"
            android:theme="@style/Theme.AppCompat"/>
    </application>

</manifest>

Gradle Build

plugins {
    alias(libs.plugins.android.application)
    alias(libs.plugins.jetbrains.kotlin.android)
}

android {
    namespace = "com.example.final_project"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.example.final_project"
        minSdk = 24
        targetSdk = 34
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
    buildFeatures {
        compose = true
    }
    composeOptions {
        kotlinCompilerExtensionVersion = "1.5.1"
    }
    packaging {
        resources {
            excludes += "/META-INF/{AL2.0,LGPL2.1}"
        }
    }
}

dependencies {

    implementation(libs.androidx.core.ktx)
    implementation(libs.androidx.lifecycle.runtime.ktx)
    implementation(libs.androidx.activity.compose)
    implementation(platform(libs.androidx.compose.bom))
    implementation(libs.androidx.ui)
    implementation(libs.androidx.ui.graphics)
    implementation(libs.androidx.ui.tooling.preview)
    implementation(libs.androidx.material3)
    implementation(libs.androidx.appcompat)
    implementation(libs.androidx.constraintlayout)
    implementation(libs.androidx.recyclerview)
    implementation(libs.androidx.recyclerview.selection)
    implementation(libs.androidx.cardview)
    testImplementation(libs.junit)
    androidTestImplementation(libs.androidx.junit)
    androidTestImplementation(libs.androidx.espresso.core)
    androidTestImplementation(platform(libs.androidx.compose.bom))
    androidTestImplementation(libs.androidx.ui.test.junit4)
    debugImplementation(libs.androidx.ui.tooling)
    debugImplementation(libs.androidx.ui.test.manifest)
}

解决方案

1. 修复`onRequestPermissionsResult`中的语法错误

代码里PERMISSION_CODE后存在错误的换行和符号（- >），导致when分支无法匹配请求码，直接触发拒绝Toast。修正后代码：

override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<out String>,
    grantResults: IntArray
) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    when(requestCode){
        PERMISSION_CODE -> {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                chooseImageGallery()
            }else{
                Toast.makeText(this,"Permission denied", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

2. 适配Android 13+的媒体权限

你的targetSdk为34（Android 13+），READ_EXTERNAL_STORAGE在API 33及以上已被废弃，需使用READ_MEDIA_IMAGES权限：

更新Manifest：添加API33+专属权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32"/>
<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" android:minSdkVersion="33"/>

更新权限请求逻辑：根据系统版本动态选择请求的权限

image_button.setOnClickListener {
    val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
        android.Manifest.permission.READ_MEDIA_IMAGES
    } else {
        android.Manifest.permission.READ_EXTERNAL_STORAGE
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
        if (checkSelfPermission(permission) == PackageManager.PERMISSION_DENIED){
            val permissions = arrayOf(permission)
            ActivityCompat.requestPermissions(this, permissions, PERMISSION_CODE)
        } else{
            chooseImageGallery()
        }
    }else{
        chooseImageGallery()
    }
}

3. 处理权限被永久拒绝的情况

若用户之前拒绝权限时勾选了“不再询问”，requestPermissions不会弹出对话框，需引导用户前往设置页开启权限：

image_button.setOnClickListener {
    val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
        android.Manifest.permission.READ_MEDIA_IMAGES
    } else {
        android.Manifest.permission.READ_EXTERNAL_STORAGE
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
        if (checkSelfPermission(permission) == PackageManager.PERMISSION_DENIED){
            // 显示权限必要性说明
            if (shouldShowRequestPermissionRationale(permission)) {
                Toast.makeText(this, "需要访问相册来选择图片", Toast.LENGTH_SHORT).show()
            }
            val permissions = arrayOf(permission)
            ActivityCompat.requestPermissions(this, permissions, PERMISSION_CODE)
        } else{
            chooseImageGallery()
        }
    }else{
        chooseImageGallery()
    }
}

在权限拒绝分支中添加跳转设置页逻辑：

// 替换原拒绝分支代码
else {
    if (!shouldShowRequestPermissionRationale(permission)) {
        // 跳转到应用设置页
        val intent = android.content.Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
        val uri = android.net.Uri.fromParts("package", packageName, null)
        intent.data = uri
        startActivity(intent)
        Toast.makeText(this, "请在设置中开启相册权限", Toast.LENGTH_SHORT).show()
    } else {
        Toast.makeText(this,"Permission denied", Toast.LENGTH_SHORT).show()
    }
}

内容的提问来源于stack exchange，提问作者Marcus Chan

Kotlin安卓应用权限对话框不显示问题求助

源代码 #

Android Manifest #

Gradle Build #

1. 修复onRequestPermissionsResult中的语法错误 #

2. 适配Android 13+的媒体权限 #

3. 处理权限被永久拒绝的情况 #

源代码

Android Manifest

Gradle Build

1. 修复`onRequestPermissionsResult`中的语法错误

2. 适配Android 13+的媒体权限

3. 处理权限被永久拒绝的情况