5.27

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打码量(行)：200

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了解到知识点：学习调用定位api

 package com.example.myapp;

 

import android.Manifest;

import android.content.Context;

import android.content.pm.PackageManager;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.widget.TextView;

import android.widget.Toast;

 

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.app.ActivityCompat;

import androidx.core.content.ContextCompat;

 

public class MainActivity extends AppCompatActivity {

 

    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1001;

 

    private TextView locationTextView;

    private LocationManager locationManager;

    private LocationListener locationListener;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 

        locationTextView = findViewById(R.id.locationTextView);

 

        // 检查定位权限

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)

                != PackageManager.PERMISSION_GRANTED) {

            // 请求定位权限

            ActivityCompat.requestPermissions(this,

                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},

                    LOCATION_PERMISSION_REQUEST_CODE);

        } else {

            // 初始化定位服务

            initializeLocationManager();

        }

    }

 

    private void initializeLocationManager() {

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        locationListener = new LocationListener() {

            @Override

            public void onLocationChanged(Location location) {

                // 处理位置更新

                updateLocationUI(location);

            }

 

            @Override

            public void onStatusChanged(String provider, int status, Bundle extras) {}

 

            @Override

            public void onProviderEnabled(String provider) {}

 

            @Override

            public void onProviderDisabled(String provider) {}

        };

        // 请求位置更新

        if (locationManager != null) {

            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,

                    0, 0, locationListener);

        }

    }

 

    private void updateLocationUI(Location location) {

        if (location != null) {

            String locationString = "Latitude: " + location.getLatitude() +

                    "\nLongitude: " + location.getLongitude();

            locationTextView.setText(locationString);

        } else {

            locationTextView.setText("Location not available");

        }

    }

 

    @Override

    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == LOCATION_PERMISSION_REQUEST_CODE) {

            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                initializeLocationManager();

            } else {

                Toast.makeText(this, "Location permission denied", Toast.LENGTH_SHORT).show();

            }

        }

    }

 

    @Override

    protected void onDestroy() {

        super.onDestroy();

        if (locationManager != null) {

            locationManager.removeUpdates(locationListener);

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

 

    <TextView

        android:id="@+id/locationTextView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Location"

        android:textSize="18sp"

        android:layout_centerInParent="true" />

 

</RelativeLayout>