2020年8月3日 23:55:36go评论76阅读模式

英文:

Right way of requesting permissions for location coordinates in Android 10

问题

以下是您提供的代码的翻译部分：

以下代码在Android 10上不起作用，直到您手动从设置中启用位置。当我查看Android 10文档时，它说如果您从可见活动中获取位置，如果是这种情况，您不需要任何前台服务，这就是我没有在这里使用任何服务的原因。

而且根据Android 10的指南，在权限获得后，我正在调用getLastLocation函数。

实现方式如下，在主活动中获取位置坐标。
请帮忙，代码中我哪里出错了？

MainActivity.java

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import androidx.annotation.NonNull;
import com.google.android.material.snackbar.Snackbar;
import androidx.core.app.ActivityCompat;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;

import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    private static final int REQUEST_PERMISSIONS_REQUEST_CODE = 34;

    private FusedLocationProviderClient mFusedLocationClient;
    protected Location mLastLocation;

    private String mLatitudeLabel;
    private String mLongitudeLabel;
    private TextView mLatitudeText;
    private TextView mLongitudeText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        mLatitudeLabel = getResources().getString(R.string.latitude_label);
        mLongitudeLabel = getResources().getString(R.string.longitude_label);
        mLatitudeText = (TextView) findViewById((R.id.latitude_text));
        mLongitudeText = (TextView) findViewById((R.id.longitude_text));

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
    }

    @Override
    public void onStart() {
        super.onStart();

        if (!checkPermissions()) {
            requestPermissions();
        } else {
            getLastLocation();
        }
    }

    @SuppressWarnings("MissingPermission")
    private void getLastLocation() {

        mFusedLocationClient.getLastLocation()
                .addOnCompleteListener(this, new OnCompleteListener<Location>() {
                    @Override
                    public void onComplete(@NonNull Task<Location> task) {
                        if (task.isSuccessful() && task.getResult() != null) {

                            mLastLocation = task.getResult();
                            Log.d("raviraj", "lat is  " + mLastLocation.getLatitude());
                            Log.d("raviraj", "long is " + mLastLocation.getLongitude());
                            mLatitudeText.setText(String.format(Locale.ENGLISH, "%s: %f",
                                    mLatitudeLabel,
                                    mLastLocation.getLatitude()));
                            mLongitudeText.setText(String.format(Locale.ENGLISH, "%s: %f",
                                    mLongitudeLabel,
                                    mLastLocation.getLongitude()));
                        } else {
                            Log.w("RAVIRAJ", "getLastLocation:exception" + task.getException());
                            showSnackbar(getString(R.string.no_location_detected));
                        }
                    }
                });
    }

    private void showSnackbar(final String text) {
        View container = findViewById(R.id.main_activity_container);
        if (container != null) {
            Snackbar.make(container, text, Snackbar.LENGTH_LONG).show();
        }
    }

    private void showSnackbar(final int mainTextStringId, final int actionStringId,
                              View.OnClickListener listener) {
        Snackbar.make(findViewById(android.R.id.content),
                getString(mainTextStringId),
                Snackbar.LENGTH_INDEFINITE)
                .setAction(getString(actionStringId), listener).show();
    }

    private boolean checkPermissions() {
        int permissionState = ActivityCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION);
        return permissionState == PackageManager.PERMISSION_GRANTED;
    }

    private void startLocationPermissionRequest() {
        ActivityCompat.requestPermissions(MainActivity.this,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                REQUEST_PERMISSIONS_REQUEST_CODE);
    }

    private void requestPermissions() {
        boolean shouldProvideRationale =
                ActivityCompat.shouldShowRequestPermissionRationale(this,
                        Manifest.permission.ACCESS_FINE_LOCATION);

        if (shouldProvideRationale) {
            Log.i(TAG, "Displaying permission rationale to provide additional context.");

            showSnackbar(R.string.permission_rationale, android.R.string.ok,
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            // Request permission
                            startLocationPermissionRequest();
                        }
                    });

        } else {
            Log.i(TAG, "Requesting permission");

            startLocationPermissionRequest();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        Log.i(TAG, "onRequestPermissionResult");
        if (requestCode == REQUEST_PERMISSIONS_REQUEST_CODE) {
            if (grantResults.length <= 0) {
                // If user interaction was interrupted, the permission request is cancelled and you
                // receive empty arrays.
                Log.i(TAG, "User interaction was cancelled.");
            } else if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission granted.
                getLastLocation();
            } else {

                showSnackbar(R.string.permission_denied_explanation, R.string.settings,
                        new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {
                                // Build intent that displays the App settings screen.
                                Intent intent = new Intent();
                                intent.setAction(
                                        Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                Uri uri = Uri.fromParts("package",
                                        BuildConfig.APPLICATION_ID, null);
                                intent.setData(uri);
                                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                startActivity(intent);
                            }
                        });
            }
        }
    }
}

Manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.android.gms.location.sample.basiclocationsample" >

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.Base" >

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />
        <activity
            android:name=".NewMain"
            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>

请注意，这只是您提供的代码的翻译部分，如果您需要任何进一步的解释或帮助，请告诉我。

英文:

Below code does not work on Android 10 until you manually enable the location from settings. When I go through the Android 10 documentation, it says if you are fetching location from the visible activity, if that was the case you don't need any foreground service, that's the reason I haven't used any service here.

And also as per Android 10 guidelines, after permission getting granted I am calling getLastLocation function.

Implementation is like, on main activity I am fetching location coordinates.
Please help, where in the code am I going wrong?

MainActivity.java

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import androidx.annotation.NonNull;
import com.google.android.material.snackbar.Snackbar;
import androidx.core.app.ActivityCompat;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private static final int REQUEST_PERMISSIONS_REQUEST_CODE = 34;
private FusedLocationProviderClient mFusedLocationClient;
protected Location mLastLocation;
private String mLatitudeLabel;
private String mLongitudeLabel;
private TextView mLatitudeText;
private TextView mLongitudeText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
mLatitudeLabel = getResources().getString(R.string.latitude_label);
mLongitudeLabel = getResources().getString(R.string.longitude_label);
mLatitudeText = (TextView) findViewById((R.id.latitude_text));
mLongitudeText = (TextView) findViewById((R.id.longitude_text));
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
}
@Override
public void onStart() {
super.onStart();
if (!checkPermissions()) {
requestPermissions();
} else {
getLastLocation();
}
}
@SuppressWarnings(&quot;MissingPermission&quot;)
private void getLastLocation() {
mFusedLocationClient.getLastLocation()
.addOnCompleteListener(this, new OnCompleteListener&lt;Location&gt;() {
@Override
public void onComplete(@NonNull Task&lt;Location&gt; task) {
if (task.isSuccessful() &amp;&amp; task.getResult() != null) {
mLastLocation = task.getResult();
Log.d(&quot;raviraj&quot;, &quot;lat is  &quot; +mLastLocation.getLatitude());
Log.d(&quot;raviraj&quot;, &quot;long is &quot; +mLastLocation.getLongitude());
mLatitudeText.setText(String.format(Locale.ENGLISH, &quot;%s: %f&quot;,
mLatitudeLabel,
mLastLocation.getLatitude()));
mLongitudeText.setText(String.format(Locale.ENGLISH, &quot;%s: %f&quot;,
mLongitudeLabel,
mLastLocation.getLongitude()));
} else {
Log.w(&quot;RAVIRAJ&quot;, &quot;getLastLocation:exception&quot; +task.getException());
showSnackbar(getString(R.string.no_location_detected));
}
}
});
}
private void showSnackbar(final String text) {
View container = findViewById(R.id.main_activity_container);
if (container != null) {
Snackbar.make(container, text, Snackbar.LENGTH_LONG).show();
}
}
private void showSnackbar(final int mainTextStringId, final int actionStringId,
View.OnClickListener listener) {
Snackbar.make(findViewById(android.R.id.content),
getString(mainTextStringId),
Snackbar.LENGTH_INDEFINITE)
.setAction(getString(actionStringId), listener).show();
}
private boolean checkPermissions() {
int permissionState = ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION);
return permissionState == PackageManager.PERMISSION_GRANTED;
}
private void startLocationPermissionRequest() {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
REQUEST_PERMISSIONS_REQUEST_CODE);
}
private void requestPermissions() {
boolean shouldProvideRationale =
ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION);
if (shouldProvideRationale) {
Log.i(TAG, &quot;Displaying permission rationale to provide additional context.&quot;);
showSnackbar(R.string.permission_rationale, android.R.string.ok,
new View.OnClickListener() {
@Override
public void onClick(View view) {
// Request permission
startLocationPermissionRequest();
}
});
} else {
Log.i(TAG, &quot;Requesting permission&quot;);
startLocationPermissionRequest();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
Log.i(TAG, &quot;onRequestPermissionResult&quot;);
if (requestCode == REQUEST_PERMISSIONS_REQUEST_CODE) {
if (grantResults.length &lt;= 0) {
// If user interaction was interrupted, the permission request is cancelled and you
// receive empty arrays.
Log.i(TAG, &quot;User interaction was cancelled.&quot;);
} else if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted.
getLastLocation();
} else {
showSnackbar(R.string.permission_denied_explanation, R.string.settings,
new View.OnClickListener() {
@Override
public void onClick(View view) {
// Build intent that displays the App settings screen.
Intent intent = new Intent();
intent.setAction(
Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts(&quot;package&quot;,
BuildConfig.APPLICATION_ID, null);
intent.setData(uri);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
}
}
}
}

Manifest.xml

&lt;manifest xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
package=&quot;com.google.android.gms.location.sample.basiclocationsample&quot; &gt;
&lt;uses-permission android:name=&quot;android.permission.ACCESS_FINE_LOCATION&quot;/&gt;
&lt;application
android:allowBackup=&quot;true&quot;
android:icon=&quot;@drawable/ic_launcher&quot;
android:label=&quot;@string/app_name&quot;
android:theme=&quot;@style/Theme.Base&quot; &gt;
&lt;meta-data
android:name=&quot;com.google.android.geo.API_KEY&quot;
android:value=&quot;@string/google_maps_key&quot; /&gt;
&lt;activity
android:name=&quot;.NewMain&quot;
android:label=&quot;@string/app_name&quot; &gt;
&lt;intent-filter&gt;
&lt;action android:name=&quot;android.intent.action.MAIN&quot; /&gt;
&lt;category android:name=&quot;android.intent.category.LAUNCHER&quot; /&gt;
&lt;/intent-filter&gt;
&lt;/activity&gt;
&lt;/application&gt;

</manifest>

答案1

得分: 0

请在AndroidManifest.xml中添加以下权限：

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

并将以下内容添加到应用程序标签中：

android:usesCleartextTraffic="true"

英文:

Please add this permission in AndroidManifest.xml

&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;

and add this to application tag

android:usesCleartextTraffic=&quot;true&quot;

答案2

得分: 0

以下是翻译好的部分：

Location is turned off in the device settings. The result could be null even if the last location was previously retrieved because disabling location also clears the cache.
1. 设备设置中已关闭位置信息。即使之前已经获取到上次的位置信息，结果也可能为null，因为禁用位置信息也会清除缓存。
The device never recorded its location, which could be the case of a new device or a device that has been restored to factory settings.
2. 设备从未记录其位置信息，这可能是新设备或设备已恢复出厂设置的情况。
Google Play services on the device has restarted, and there is no active Fused Location Provider client that has requested location after the services restarted. To avoid this situation you can create a new client and request location updates yourself. For more information, see Receiving Location Updates.
3. 设备上的Google Play服务已重新启动，并且在服务重新启动后没有处于活动状态的Fused Location Provider客户端请求位置信息。为避免此情况，您可以创建一个新客户端并自行请求位置更新。有关更多信息，请参阅接收位置更新。

在您的情况下，只有在GPS开启时才能获取位置信息，即使是上次已知的位置信息。
在您的情况下，只有在GPS开启时才能获取位置信息，即使是上次已知的位置信息。

以上为翻译好的部分。

英文:

Well there is a problem. Official documentation states that it can be null in some cases

https://developer.android.com/training/location/retrieve-current

Location is turned off in the device settings. The result could be null even if the last location was previously retrieved because disabling location also clears the cache.
The device never recorded its location, which could be the case of a new device or a device that has been restored to factory settings.
Google Play services on the device has restarted, and there is no active Fused Location Provider client that has requested location after the services restarted. To avoid this situation you can create a new client and request location updates yourself. For more information, see Receiving Location Updates.

In your case you can get location only if GPS is ON. Even for last known location.

https://developer.android.com/training/location/retrieve-current#last-known

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在Android 10中请求位置坐标权限的正确方式是：

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