Android 如何解决;错误:找不到符号变量new“u location”;在安卓工作室?
我正在尝试执行以下基本教程: 我已经能够复制代码并将accessToken插入适当的位置。我的.xml文件或gradle脚本中没有任何错误。但是,在MainActivity中,我有以下错误:Android 如何解决;错误:找不到符号变量new“u location”;在安卓工作室?,android,android-gradle-plugin,mapbox,Android,Android Gradle Plugin,Mapbox,我正在尝试执行以下基本教程: 我已经能够复制代码并将accessToken插入适当的位置。我的.xml文件或gradle脚本中没有任何错误。但是,在MainActivity中,我有以下错误: error: cannot find symbol variable user_location_permission_explanation error: cannot find symbol variable user_location_permission_not_granted error: can
error: cannot find symbol variable user_location_permission_explanation
error: cannot find symbol variable user_location_permission_not_granted
error: cannot find symbol variable new_location
我已经能够在打开应用程序时生成显示相同位置/区域(即特定经度和纬度)的基本地图盒地图
以下是我的主要活动的导入
import android.annotation.SuppressLint;
import android.location.Location;
import android.util.Log;
import android.widget.Toast;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.annotation.NonNull;
// Classes needed to initialize the map
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
// Classes needed to handle location permissions
import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;
import java.util.List;
// Classes needed to add the location engine
import com.mapbox.android.core.location.LocationEngine;
import com.mapbox.android.core.location.LocationEngineCallback;
import com.mapbox.android.core.location.LocationEngineProvider;
import com.mapbox.android.core.location.LocationEngineRequest;
import com.mapbox.android.core.location.LocationEngineResult;
import java.lang.ref.WeakReference;
// Classes needed to add the location component
import com.mapbox.mapboxsdk.location.LocationComponent;
import com.mapbox.mapboxsdk.location.LocationComponentActivationOptions;
import com.mapbox.mapboxsdk.location.modes.CameraMode;
import com.mapbox.mapboxsdk.location.modes.RenderMode;
错误问题出现在以下位置:
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
Toast.makeText(this, R.string.user_location_permission_explanation, Toast.LENGTH_LONG).show();
}
以下是我的activity_main.xml文件:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="0dp"
android:layout_height="0dp"
mapbox:layout_constraintBottom_toBottomOf="parent"
mapbox:layout_constraintEnd_toEndOf="parent"
mapbox:layout_constraintStart_toStartOf="parent"
mapbox:layout_constraintTop_toTopOf="parent"
mapbox:mapbox_cameraTargetLat="36.16266"
mapbox:mapbox_cameraTargetLng="-86.78160"
mapbox:mapbox_cameraZoom="12"/>
</android.support.constraint.ConstraintLayout>
我的模块build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 15
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.mapbox.mapboxsdk:mapbox-android-sdk:7.3.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
我希望应用程序在Mapbox地图上显示我的笔记本电脑设备的当前位置。但是,我无法在当前状态的虚拟设备上运行应用程序 出现错误,因为字符串中没有任何名为“用户位置权限解释”、“用户位置权限未授予”或“新位置”的字符串。xml
解决方案1。
只需将“R.string.user\u location\u permission\u not\u grated”替换为您自己的字符串,例如:
Toast.makeText(this, "Location permission granted", Toast.LENGTH_LONG).show();
Toast.makeText(this, "Location not granted", Toast.LENGTH_LONG).show();
Toast.makeText(activity, String.format("New Location",
String.valueOf(result.getLastLocation().getLatitude()), String.valueOf(result.getLastLocation().getLongitude())),
Toast.LENGTH_SHORT).show();
解决方案2.双击strings.xml文件并添加3个新字符串,其名称与活动引用的字符串完全相同
<resources>
<string name="app_name">MapboxApp</string>
<string name="user_location_permission_explanation">Permission granted</string>
<string name="user_location_permission_not_granted">Permission not granted</string>
<string name="new_location">New Location</string>
</resources>
MapboxApp
准许
未授予许可
新位置
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 15
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.mapbox.mapboxsdk:mapbox-android-sdk:7.3.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Toast.makeText(this, "Location permission granted", Toast.LENGTH_LONG).show();
Toast.makeText(this, "Location not granted", Toast.LENGTH_LONG).show();
Toast.makeText(activity, String.format("New Location",
String.valueOf(result.getLastLocation().getLatitude()), String.valueOf(result.getLastLocation().getLongitude())),
Toast.LENGTH_SHORT).show();
<resources>
<string name="app_name">MapboxApp</string>
<string name="user_location_permission_explanation">Permission granted</string>
<string name="user_location_permission_not_granted">Permission not granted</string>
<string name="new_location">New Location</string>
</resources>