使用位置信息按钮请求基于会话的位置信息访问权限

<?xml version="1.0" encoding="utf-8"?>
<!--
     Copyright 2026 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          https://www.apache.org/licenses/LICENSE-2.0

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     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- 1. Standard Coarse and Fine Location Permissions -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- Optional: If your app is only using the location button to access 
    location, you should add the "onlyForLocationButton" flag shown below to
    your ACCESS_FINE_LOCATION declaration.

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" 
    android:usesPermissionFlags="onlyForLocationButton"/>

    Note: Adding this flag restricts your app from accessing the precise 
    location permission via the broader permission, and that users will be 
    required to use the location button in order to share precise location with 
    the app. This is designed to improve user privacy & trust when granting location access.
    -->

    <!-- 2. CRITICAL: Required system permission for rendering the LocationButton -->
    <uses-permission android:name="android.permission.USE_LOCATION_BUTTON" />

    <application
        android:icon="@mipmap/ic_launcher"
        android:label="LocationButtonSample"
        android:theme="@style/Theme.PinPoint">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>
AndroidManifest.xml

import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.width
import androidx.compose.runtime.Composable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.core.locationbutton.compose.LocationButton
import androidx.core.locationbutton.compose.LocationButtonTextType

@Composable
fun LocationPermissionScreen(onPermissionGranted: () -> Unit, onPermissionDenied: () -> Unit) {
    // Renders the secure system-trusted Location Button composable
    LocationButton(
        // Callback triggered when the user taps the secure button and makes a decision on the permission dialog
        onPermissionResult = { isGranted ->
            if (isGranted) {
                onPermissionGranted()
            } else {
                onPermissionDenied()
            }
        },
        /* ============================================================================
         * VISUAL CUSTOMIZATIONS
         * Un-comment any of the parameters below to customize the button's aesthetics.
         * If omitted, the button falls back to secure, high-contrast system defaults.
         * ============================================================================ */
        /*
        // LABEL TEXT TYPE:
        // Predefined system strings rendered inside the secure process.
        // Options: PreciseLocation, UsePreciseLocation, SharePreciseLocation,
        // NearMyPreciseLocation, or None (for an icon-only button).
        textType = LocationButtonTextType.UsePreciseLocation,

        // COLOR PALETTE:
        // Customize the container background, text label, and icon tint colors.
        backgroundColor = Color(0xFF00796B), // e.g., Material Teal
        textColor = Color.White,
        iconTint = Color(0xFFFFC107),        // e.g., Amber icon tint

        // CORNER RADIUS & SHAPE:
        // Define the resting corner radius and the morphed radius when pressed.
        cornerRadius = 24.dp,        // Rounded capsule shape
        pressedCornerRadius = 12.dp, // Morphs to sharper corners on tap

        // OUTLINE STROKE (BORDERS):
        // Add a contrasting outline stroke around the button bounds.
        strokeColor = Color(0xFF004D40),
        strokeWidth = 2.dp,

        // INTERACTIVE TOUCH PADDING:
        // Defines the secure clickable touch target boundary.
        // Coerced securely by the system between 4.dp and 8.dp.
        clickablePadding = PaddingValues(6.dp)
        */
    )
}
LocationButton.kt