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文件

<?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轉爲數組
        if (permissionList.isEmpty()) { 
            //不可能爲空
        } else { 
            ActivityCompat.requestPermissions(activity, permissionsArray, requestCode);
            //返回結果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函數返回一個bool類型,判斷當前參數請求的權限是否打開
        if (providerEnabled) { 
            /* * par1:定位類型,這裏使用的是GPS * par2:更新週期(ms) * par3:更新最小範圍(cm) * par4:監聽委託(使用匿名函數進行邏輯處理) * */
            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) { 
            //位置信息變化時觸發
            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按鈕以後進行獲取

點擊UnListen以後關閉GPS

真的結束了,祝你好運!