问题：ActivityCompat.requestPermissions 没有向用户显示对话框，而是自动拒绝权限。 ACCESS_BACKGROUND_LOCATION 和 ACCESS_FINE_LOCATION 都会发生这种情况。
我已经尝试了stackoverflow上建议的解决方案，但没有成功。因此，我决定按照建议制作一个极简项目，它只有一个 MainActivity，仅请求位置权限并显示消息“拒绝”/“授予”。
调试时，我可以看到 onRequestPermissionsResult 对于两个权限（在 int[] grantResults 内）的响应都是 -1，这意味着权限被拒绝，但是请求权限的对话框永远不会弹出。如果我清除所有应用程序数据并卸载应用程序并再次重新安装（以防万一用户在某个时候按下“不要再问我”），也会发生这种情况。执行此操作后，我检查 Android 设备上的配置，在应用程序权限内，我可以看到位置位于“拒绝”类别中。
我正在 Android 11 上进行测试。
这是MainActivity.java:
package com.example.robotito_calibration;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
List<String> permissionsNeeded = new ArrayList<>();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
permissionsNeeded.add(Manifest.permission.ACCESS_FINE_LOCATION);
}
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_BACKGROUND_LOCATION) != PackageManager.PERMISSION_GRANTED) {
permissionsNeeded.add(Manifest.permission.ACCESS_BACKGROUND_LOCATION);
}
if (!permissionsNeeded.isEmpty()) {
ActivityCompat.requestPermissions((Activity) this,
permissionsNeeded.toArray(new String[0]),
1);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
// Check if the permission was granted
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted, you can proceed with your task
Toast.makeText(this, "Granted", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "Denied", Toast.LENGTH_LONG).show();
// Permission denied, show a message or take appropriate action
}
}
}
}
这是我的清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.robotito_calibration">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<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/Theme.Robotito_Calibration">
<activity
android:name=".MainActivity"
android:screenOrientation="portrait"
android:label="@string/app_name"
android:theme="@style/Theme.Robotito_Calibration.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
构建.gradle：
plugins {
id 'com.android.application'
}
android {
compileSdkVersion 30
defaultConfig {
applicationId "com.example.robotito_calibration"
minSdkVersion 21
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.navigation:navigation-fragment:2.2.2'
implementation 'androidx.navigation:navigation-ui:2.2.2'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
运行时检查权限：
使用
ContextCompat.checkSelfPermission()ActivityCompat.requestPermissions()private static final int LOCATION_PERMISSION_REQUEST_CODE = 100;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_BACKGROUND_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_BACKGROUND_LOCATION},
LOCATION_PERMISSION_REQUEST_CODE);
} else {
// Permission has already been granted
// Proceed with location-related operations
// For example, start location updates
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == LOCATION_PERMISSION_REQUEST_CODE) {
// Check if all permissions are granted
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Location permissions are granted
// Proceed with location-related operations
} else {
// Location permissions are not granted
// Handle the case where the user denies permission
}
}
}
从 Android 10（API 级别 29）开始，
ACCESS_BACKGROUND_LOCATION这是用于谷歌播放的：
如果您的应用面向 Android 10（API 级别 29）或更高版本并需要后台位置访问，则需要单独请求
ACCESS_BACKGROUND_LOCATION