如何在Android中獲取當前位置的經緯度?
此示例演示如何在 Android 中獲取當前位置的經緯度。
步驟 1 − 在 Android Studio 中建立一個新專案,轉到檔案 ⇒ 新建專案,並填寫所有必需的詳細資訊以建立新專案。
步驟 2 − 將以下程式碼新增到 res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:gravity="center" tools:context=".MainActivity"> <TextView android:id="@+id/showLocation" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="Location" android:textSize="24sp" /> <Button android:id="@+id/btnGetLocation" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Get Location" /> </LinearLayout>
步驟 3 − 將以下程式碼新增到 src/MainActivity.java
import android.Manifest;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_LOCATION = 1;
Button btnGetLocation;
TextView showLocation;
LocationManager locationManager;
String latitude, longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions( this,
new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
showLocation = findViewById(R.id.showLocation);
btnGetLocation = findViewById(R.id.btnGetLocation);
btnGetLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
location nManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
OnGPS();
} else {
getLocation();
}
}
});
}
private void OnGPS() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Enable GPS").setCancelable(false).setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
final AlertDialog alertDialog = builder.create();
alertDialog.show();
}
private void getLocation() {
if (ActivityCompat.checkSelfPermission(
MainActivity.this,Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
} else {
Location locationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (locationGPS != null) {
double lat = locationGPS.getLatitude();
double longi = locationGPS.getLongitude();
latitude = String.valueOf(lat);
longitude = String.valueOf(longi);
showLocation.setText("Your Location: " + "
" + "Latitude: " + latitude + "
" + "Longitude: " + longitude);
} else {
Toast.makeText(this, "Unable to find location.", Toast.LENGTH_SHORT).show();
}
}
}
}步驟 4 − 將以下程式碼新增到 androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_COARSE_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/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行您的應用程式。我假設您已將您的實際 Android 移動裝置連線到您的計算機。要在 Android Studio 中執行應用程式,請開啟您的一個專案活動檔案,然後單擊工具欄中的執行
圖示。選擇您的移動裝置作為選項,然後檢查您的移動裝置,它將顯示您的預設螢幕 –


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