android - Android デバイスで GPS 位置情報にアクセスするために使用する API はどれですか? Android API または Google Location Services API

Question

私はAndroid開発の初心者です。分散位置推定アルゴリズムを使用して GPS 位置推定用の Android アプリを開発する必要があります。近隣ノードの位置情報を使用して、現在の GPS 位置を計算します。Google Location Services API が推奨されていることを、Android の位置に関するドキュメントhttp://developer.android.com/reference/android/location/package-summary.htmlで知りました。私はここでかなりの数の投稿を行ってきましたが、まだ霧の中にあります. 任意の入力を歓迎します。

MainActivity.java

package com.example.sxn8837.locationapi;



import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

import static com.example.sxn8837.locationapi.R.*;
import static com.example.sxn8837.locationapi.R.layout.activity_main;
import static com.google.android.gms.location.LocationServices.*;

public class MainActivity extends Activity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,LocationListener {

    private static final String TAG = MainActivity.class.getSimpleName();
    private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;
    private Location mLastLocation;
    private GoogleApiClient mGoogleApiClient;
    private boolean mRequestLocationUpdates = false ;
    private LocationRequest mLocationRequest;
    private static int UPDATE_INTERVAL = 10000;
    private static int FASTEST_INTERVAL = 5000;
    private static int DISPLACEMENT = 10;




    private TextView lbLocation;
    private Button btnStartLocationUpdates = (Button) findViewById(id.buttonLocationUpdates);
    private Button btnShowLocation = (Button) findViewById(id.buttonShowLocation);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(activity_main);
        lbLocation = (TextView) findViewById(id.lblLocation);
        if(checkPlayServices()){
         buildGoogleApiClient();
         createLocationRequest();
        }

        btnShowLocation.setOnClickListener(new View.OnClickListener (){

            public void onClick(View v){

                displayLocation();

            }
        });

        btnStartLocationUpdates.setOnClickListener(new View.OnClickListener(){

            public void onClick( View v){

                togglePeriodLocationUpdates();
            }

        });
    }

    protected void onStart(){
        super.onStart();
        if(mGoogleApiClient != null){
            mGoogleApiClient.connect();
        }
    }

    protected void onResume(){
        super.onResume();
        checkPlayServices();
        if(mGoogleApiClient.isConnected() && mRequestLocationUpdates ){
            startLocationUpdates();
        }
    }

    protected void onStop(){
        super.onStop();
        if(mGoogleApiClient.isConnected()  ){
            mGoogleApiClient.disconnect();
        }

    }

    protected void onPause(){
        super.onPause();
        stopLocationUpdates();
    }

    private void displayLocation(){

        mLastLocation = FusedLocationApi.getLastLocation(mGoogleApiClient);
        if(mLastLocation !=  null){
            double latitude = mLastLocation.getLatitude();
            double longitude = mLastLocation.getLongitude();
            lbLocation.setText(latitude + "," +longitude);
        }
        else {
            lbLocation.setText("Couldn't get Location Updates");
        }
    }

    private void togglePeriodLocationUpdates(){
        if(!mRequestLocationUpdates) {
            btnStartLocationUpdates.setText(getString(string.btn_stop_location_update));

            mRequestLocationUpdates = true;

            startLocationUpdates();
        }

        else {

            btnStartLocationUpdates.setText(getString(string.btn_stop_location_update));

            mRequestLocationUpdates = false ;

            stopLocationUpdates();


        }
    }

    protected synchronized void buildGoogleApiClient(){

        mGoogleApiClient = new GoogleApiClient.Builder(this).addConnectionCallbacks(this).addOnConnectionFailedListener(this)
                           .addApi(API).build();
    }

    protected void createLocationRequest(){
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(UPDATE_INTERVAL);
        mLocationRequest.setInterval(FASTEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
    }

    private boolean checkPlayServices(){
        int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

        if(resultCode != ConnectionResult.SUCCESS){

            if(GooglePlayServicesUtil.isUserRecoverableError(resultCode)){
           GooglePlayServicesUtil.getErrorDialog(resultCode,this,PLAY_SERVICES_RESOLUTION_REQUEST).show();

            }else{

                Toast.makeText(getApplicationContext(),"This Device is not supported", Toast.LENGTH_LONG).show();
                finish();
            }
         return false ;
        }

        return true;
    }

    protected void startLocationUpdates(){
        FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest, (com.google.android.gms.location.LocationListener) this);
    }

    protected void stopLocationUpdates (){
        final PendingResult<Status> statusPendingResult = FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (com.google.android.gms.location.LocationListener) this);


    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onConnected(Bundle bundle) {

        displayLocation();

        if(mRequestLocationUpdates){
            startLocationUpdates();
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
     mGoogleApiClient.connect();
    }

    @Override
    public void onLocationChanged(Location location) {

        mLastLocation = location ;

        Toast.makeText(getApplicationContext(),"Location Changed",Toast.LENGTH_SHORT).show();
        displayLocation();

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
       Log.i(TAG, "Connection Failed:" + connectionResult.getErrorCode());
    }
}

content_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"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:layout_gravity="center_horizontal"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_main" tools:context=".MainActivity">

    <TextView android:text="@string/lbl_you_are_at"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize = "25sp"
        android:textStyle = "bold"/>

    <TextView
        android:id="@+id/lblLocation"
        android:padding="15dp"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textSize = "16sp"
        android:textStyle = "bold"/>

    <Button
        android:id="@+id/buttonShowLocation"
        android:padding="20dp"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_marginTop="40dp"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:text = "@string/btn_get_location"
        android:textSize = "16sp"
        android:textStyle = "bold"/>
    >

    <Button
        android:id="@+id/buttonLocationUpdates"
        android:padding="20dp"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_marginTop="60dp"
        android:background="@color/common_signin_btn_default_background"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:text = "@string/btn_start_location_update"
        android:textSize = "16sp"
        android:textStyle = "bold"/>
        >

</LinearLayout>

Androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.sxn8837.locationapi" >
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar" >

        <meta-data
            android:name = "com.google.android.gms.version"
            android:value = "@integer/google_play_services_version"
            />
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

ログキャット

11-09 20:18:13.352 3645-3645/? D/dalvikvm: Not late-enabling CheckJNI (already on)
11-09 20:18:15.012 3645-3645/com.example.sxn8837.locationapi I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
11-09 20:18:15.022 3645-3645/com.example.sxn8837.locationapi W/dalvikvm: VFY: unable to resolve virtual method 511: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
11-09 20:18:15.022 3645-3645/com.example.sxn8837.locationapi D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
11-09 20:18:15.032 3645-3645/com.example.sxn8837.locationapi I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
11-09 20:18:15.032 3645-3645/com.example.sxn8837.locationapi W/dalvikvm: VFY: unable to resolve virtual method 533: Landroid/content/res/TypedArray;.getType (I)I
11-09 20:18:15.032 3645-3645/com.example.sxn8837.locationapi D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
11-09 20:18:15.312 3645-3645/com.example.sxn8837.locationapi I/dalvikvm: Could not find method android.content.pm.PackageManager.getPackageInstaller, referenced from method com.google.android.gms.common.GooglePlayServicesUtil.zzh
11-09 20:18:15.312 3645-3645/com.example.sxn8837.locationapi W/dalvikvm: VFY: unable to resolve virtual method 438: Landroid/content/pm/PackageManager;.getPackageInstaller ()Landroid/content/pm/PackageInstaller;
11-09 20:18:15.312 3645-3645/com.example.sxn8837.locationapi D/dalvikvm: VFY: replacing opcode 0x6e at 0x000b
11-09 20:18:15.332 3645-3645/com.example.sxn8837.locationapi W/GooglePlayServicesUtil: Google Play services is missing.
11-09 20:18:15.502 3645-3645/com.example.sxn8837.locationapi D/dalvikvm: GC_FOR_ALLOC freed 158K, 11% free 3301K/3692K, paused 83ms, total 86ms
11-09 20:18:16.002 3645-3645/com.example.sxn8837.locationapi D/dalvikvm: GC_FOR_ALLOC freed 3K, 11% free 3451K/3848K, paused 23ms, total 23ms
11-09 20:18:16.022 3645-3645/com.example.sxn8837.locationapi I/dalvikvm-heap: Grow heap (frag case) to 5.278MB for 1764376-byte allocation
11-09 20:18:16.052 3645-3654/com.example.sxn8837.locationapi D/dalvikvm: GC_FOR_ALLOC freed <1K, 8% free 5174K/5572K, paused 29ms, total 29ms
11-09 20:18:16.282 3645-3645/com.example.sxn8837.locationapi W/GooglePlayServicesUtil: Google Play services is missing.
11-09 20:18:16.332 3645-3645/com.example.sxn8837.locationapi D/AndroidRuntime: Shutting down VM
11-09 20:18:16.332 3645-3645/com.example.sxn8837.locationapi W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xb1adbba8)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime: FATAL EXCEPTION: main
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime: Process: com.example.sxn8837.locationapi, PID: 3645
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime: java.lang.RuntimeException: Unable to resume activity {com.example.sxn8837.locationapi/com.example.sxn8837.locationapi.MainActivity}: java.lang.NullPointerException
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2774)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2238)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:135)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5001)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:  Caused by: java.lang.NullPointerException
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at com.example.sxn8837.locationapi.MainActivity.onResume(MainActivity.java:86)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.Activity.performResume(Activity.java:5310)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2764)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2238)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:135)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5001)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
11-09 20:18:16.342 3645-3645/com.example.sxn8837.locationapi E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)

score 0 · Accepted Answer

Google Play Services の一部である Google Location Services API は、位置情報プロバイダー、ユーザーの移動、および位置精度を自動的に処理する、より強力で高度なフレームワークを提供します。また、提供された電力消費パラメーターに基づいて位置情報の更新スケジュールも処理します。ほとんどの場合、Location Services API を使用すると、バッテリーパフォーマンスが向上し、適切な精度が得られます。

http://developer.android.com/guide/topics/location/strategies.html

android - Android デバイスで GPS 位置情報にアクセスするために使用する API はどれですか? Android API または Google Location Services API

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