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按鈕之後進行獲取
點擊UnListen之後關閉GPS
