Question

我又对我们的一个学校项目提出了另一个问题。这次，我们想做类似Android的事件策划器之类的事情。我看过很多这样的帖子，但似乎没有一个对我有帮助。我正在寻找一种简单的解决方案，以通过按钮获取当前的经度，纬度和经度，以将其保存在变量中，但是如果我在“ getCurrentLocation（）;”处设置调试点，请启动我的应用程序，然后单击按钮my即使我取消对gpsEnabled和networkEnabled标志的注释，IDE也会在调试完成后调试两个try catch。我的错在哪里

这是我的 MainActivity.java

package com.example.simplevents;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

protected LocationManager locationManager;

protected Location currentLocation;

protected Button retrieveLocationButton;

public double currentGPSLatitude;
public double currentGPSLongitude;
public double currentGPSAltitude;

public double currentNETLatitude;
public double currentNETLongitude;
public double currentNETAltitude;

protected boolean gpsEnabled;

protected boolean networkEnabled;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    retrieveLocationButton = findViewById(R.id.retrieve_location_button);

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

    retrieveLocationButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            getCurrentLocation();
        }
    });

}

public void getCurrentLocation() {

    try {
        gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    } catch (Exception e) {
        e.printStackTrace();
    }

    try {
        networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    } catch (Exception e) {
        e.printStackTrace();
    }

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }
    if (gpsEnabled) {
        currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        currentGPSLongitude = currentLocation.getLongitude();
        currentGPSLatitude = currentLocation.getLatitude();
        currentGPSAltitude = currentLocation.getAltitude();
    } else if (networkEnabled) {
        currentLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        currentNETLongitude = currentLocation.getLongitude();
        currentNETLatitude = currentLocation.getLatitude();
        currentNETAltitude = currentLocation.getAltitude();
    }

    Toast.makeText(MainActivity.this, "lat:" + currentNETLatitude + "long:" + currentNETLongitude + "alt:" + currentNETAltitude,
            Toast.LENGTH_LONG).show();
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout     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:visibility="visible"
tools:context=".MainActivity">

<Button
    android:id="@+id/retrieve_location_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="16dp"
    android:layout_marginEnd="96dp"
    android:layout_marginRight="96dp"
    android:clickable="true"
    android:focusable="true"
    android:visibility="visible"
    app:backgroundTint="@android:color/darker_gray"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/editText"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@android:drawable/ic_menu_compass" />

<EditText
    android:id="@+id/editText"
    android:layout_width="wrap_content"
    android:layout_height="51dp"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="16dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:text="Name"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

androidmanifest.xml

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

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

<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"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


</application>

</manifest>

预先感谢

如何获取当前设备位置？

0 个答案: