错误：程序包PermissionUtils不存在 [英] error: package PermissionUtils does not exist

问题描述

我想通过我的应用程序找到用户的当前位置，我从Github复制了源代码，但我不知道它不会给我任何错误，只是这个。
这里是我所有库的代码，以防万一您错过了一个库。

android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMyLocationButtonClickListener;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;

导入android.Manifest;
导入android.content.pm.PackageManager;
导入android.os.Bundle;
导入android.support.annotation.NonNull;
导入android.support.v4.app.ActivityCompat;
导入android.support.v4.content.ContextCompat;
导入android.support.v7.app.AppCompatActivity;
导入android.widget.Toast;

公共类位置扩展AppCompatActivity
实现
OnMyLocationButtonClickListener，
OnMapReadyCallback，
ActivityCompat.OnRequestPermissionsResultCallback {

/ **
*请求位置权限请求的代码。
*
* @see #onRequestPermissionsResult（int，String []，int []）
* /
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1;

/ **
*表示请求的权限是否在
返回后被拒绝的标志。{@link #onRequestPermissionsResult（int，String []，int []）} 。
* /
private boolean mPermissionDenied = false;

私有GoogleMap mMap;

@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_location）;

SupportMapFragment mapFragment =
（SupportMapFragment）getSupportFragmentManager（）。findFragmentById（R.id.map）;
mapFragment.getMapAsync（this）;
}

@Override
public void onMapReady（GoogleMap map）{
mMap = map;

mMap.setOnMyLocationButtonClickListener（this）;
enableMyLocation（）;
}

/ **
*如果已授予罚款位置权限，则启用我的位置图层。
* /
private void enableMyLocation（）{
if（ContextCompat.checkSelfPermission（this，Manifest.permission.ACCESS_FINE_LOCATION）
！= PackageManager.PERMISSION_GRANTED）{
/ /访问该位置的权限丢失。
PermissionUtils.requestPermission（this，LOCATION_PERMISSION_REQUEST_CODE，
Manifest.permission.ACCESS_FINE_LOCATION，true）;
} else if（mMap！= null）{
//访问位置已被授予应用程序。
mMap.setMyLocationEnabled（true）;



@Override
public boolean onMyLocationButtonClick（）{
Toast.makeText（this，MyLocation button clicked，Toast.LENGTH_SHORT） 。显示（）;
//返回false，以便我们不消耗事件并且默认行为仍然发生
//（相机动画到用户的当前位置）。
返回false;


$ b @Override
public void onRequestPermissionsResult（int requestCode，@NonNull String []权限，
@NonNull int [] grantResults）{
if（requestCode！= LOCATION_PERMISSION_REQUEST_CODE）{
return;
}

if（PermissionUtils.isPermissionGranted（permissions，grantResults，
Manifest.permission.ACCESS_FINE_LOCATION））{
//启用我的位置图层，如果权限有被授予。
enableMyLocation（）;
} else {
//片段恢复时显示丢失的权限错误对话框。
mPermissionDenied = true; （）;
}
}

@Override
保护无效的onResumeFragments（）{
super.onResumeFragments（）;
if（mPermissionDenied）{
//权限未被授予，显示错误对话框。
showMissingPermissionError（）;
mPermissionDenied = false;
}
}

/ **
*显示一个对话框，其中包含错误消息，说明位置权限丢失。
* /
private void showMissingPermissionError（）{
PermissionUtils.PermissionDeniedDialog
.newInstance（true）.show（getSupportFragmentManager（），dialog）;
}

}

解决方案

这是因为您的示例代码是Google教程的一部分，并且不完整。 此处是位于同一项目中的GitHub上的PermissionUtilsCode

I want to find the current location of the user through my app and I copied the source code from Github and I don't know it does not give me any error but this one. Here's my code with all the libraries in case you think I have missed a library.

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMyLocationButtonClickListener;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class location extends AppCompatActivity
        implements
        OnMyLocationButtonClickListener,
        OnMapReadyCallback,
        ActivityCompat.OnRequestPermissionsResultCallback {

    /**
     * Request code for location permission request.
     *
     * @see #onRequestPermissionsResult(int, String[], int[])
     */
    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1;

    /**
     * Flag indicating whether a requested permission has been denied after returning in
     * {@link #onRequestPermissionsResult(int, String[], int[])}.
     */
    private boolean mPermissionDenied = false;

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_location);

        SupportMapFragment mapFragment =
                (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        mMap = map;

        mMap.setOnMyLocationButtonClickListener(this);
        enableMyLocation();
    }

    /**
     * Enables the My Location layer if the fine location permission has been granted.
     */
    private void enableMyLocation() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            // Permission to access the location is missing.
            PermissionUtils.requestPermission(this, LOCATION_PERMISSION_REQUEST_CODE,
                    Manifest.permission.ACCESS_FINE_LOCATION, true);
        } else if (mMap != null) {
            // Access to the location has been granted to the app.
            mMap.setMyLocationEnabled(true);
        }
    }

    @Override
    public boolean onMyLocationButtonClick() {
        Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT).show();
        // Return false so that we don't consume the event and the default behavior still occurs
        // (the camera animates to the user's current position).
        return false;
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) {
            return;
        }

        if (PermissionUtils.isPermissionGranted(permissions, grantResults,
                Manifest.permission.ACCESS_FINE_LOCATION)) {
            // Enable the my location layer if the permission has been granted.
            enableMyLocation();
        } else {
            // Display the missing permission error dialog when the fragments resume.
            mPermissionDenied = true;
        }
    }

    @Override
    protected void onResumeFragments() {
        super.onResumeFragments();
        if (mPermissionDenied) {
            // Permission was not granted, display error dialog.
            showMissingPermissionError();
            mPermissionDenied = false;
        }
    }

    /**
     * Displays a dialog with error message explaining that the location permission is missing.
     */
    private void showMissingPermissionError() {
        PermissionUtils.PermissionDeniedDialog
                .newInstance(true).show(getSupportFragmentManager(), "dialog");
    }

}

解决方案

This is because your sample code is part from Google tutorials and is not complete. Here is the PermissionUtilsCode located in GitHub in the same project

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