Android GPS定位(課設)

使用AndroidAPI提供的LocationManager進行定位,獲取經緯度

前臺.xml檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/txt_1"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/txt_2"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/txt_3"/>
    </LinearLayout>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:gravity="center">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="doClick"
        android:text="Listen"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="disClick"
        android:text="UnListen"/>

</LinearLayout>


</LinearLayout>

PermissionUtils.java工具類(判斷是否有權限,動態獲取權限)

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.Size;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import java.util.ArrayList;
import java.util.List;
public class PermissionUtils {
     // 判斷是否有權限
    public static boolean hasPermissions(@NonNull Context context, @Size(min = 1) @NonNull String... perms) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            return true;
        }
        if (context == null) {
            throw new IllegalArgumentException("Can't check permissions for null context");
        }
        for (String perm : perms) {
            if (ContextCompat.checkSelfPermission(context, perm) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }


    //申請權限
    public static void requestPermissions(@NonNull Activity activity, int requestCode, String[] permissions) {

        List<String> permissionList = new ArrayList<>();
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) {
                permissionList.add(permission);
            }
        }

        String[] permissionsArray = permissionList.toArray(new String[permissionList.size()]);//將List轉為陣列
        if (permissionList.isEmpty()) {
            //不可能為空
        } else {
            ActivityCompat.requestPermissions(activity, permissionsArray, requestCode);
            //回傳結果onRequestPermissionsResult
        }
    }
}

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity  {
    private LocationManager mLocationManager;
    private TextView txt_1;
    private TextView txt_2;
    private TextView txt_3;

    private String[] permissions = {
            Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.ACCESS_COARSE_LOCATION
    };

    private static final int REQUEST_PERMISSION_CODE = 12;//定位權限
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }
    public void doClick(View view) {
        if (!PermissionUtils.hasPermissions(this, permissions)) {
            PermissionUtils.requestPermissions(this, REQUEST_PERMISSION_CODE, permissions);
        } else {
            startLocate();
        }
    }
    public void disClick(View view) {
        mLocationManager.removeUpdates(locationListener);
        cleanText();
    }

    public void init()
    {
        txt_1=findViewById(R.id.txt_1);
        txt_2=findViewById(R.id.txt_2);
        txt_3=findViewById(R.id.txt_3);
    }

    @SuppressLint("MissingPermission")
    private void startLocate() {
         mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);//獲取定位權限
        boolean providerEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);//isProviderEnabled函式回傳一個bool型別,判斷當前引數請求的權限是否打開
        if (providerEnabled) {
            /*
            * par1:定位型別,這里使用的是GPS
            * par2:更新周期(ms)
            * par3:更新最小范圍(cm)
            * par4:監聽委托(使用匿名函式進行邏輯處理)
            * */
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        } else {
            Toast.makeText(this, "請打開GPS", Toast.LENGTH_SHORT).show();
        }
    }

    private LocationListener locationListener = new LocationListener() {
        @SuppressLint("SetTextI18n")
        @Override
        public void onLocationChanged(Location location) {
            //位置資訊變化時觸發
            txt_1.setText("定位方式：" + location.getProvider());
            txt_2.setText("緯度：" + location.getLatitude());
            txt_3.setText("經度：" + location.getLongitude());
        }
    };
    @SuppressLint("SetTextI18n")
    private void cleanText()
    {
        txt_1.setText("定位方式：" +"???");
        txt_2.setText("緯度：" +"0.0");
        txt_3.setText("經度：" +"0.0");
    }

}

在AndroidManifest.xml中添加權限

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

結束,看一下運行效果

點擊Listen按鈕之后進行獲取

點擊UnListen之后關閉GPS

真的結束了,祝你好運!