我是Android的新手，我正在尝试构建一个应用程序来显示我当前的位置，并且我正在跟踪来自google链接here的apidemos中的设置。这是作业的一部分，所以我不想透露我的最终目标是什么。现在我希望能够在我的应用程序上运行gps位置。我将发布我的活动代码，xml布局代码，清单代码和gradle代码。如果还有什么需要发布的，请告诉我。我试过搜索，但我找不到任何东西。此外，如果它有助于我主要为我的手机制作这个。 Nexus 6p Android 6.0.1
编辑：得到OnRequestPermissionsResultCallback工作但仍然有PermissionUtils给我一个错误。
我会评论我的错误/无法解决的地方
XML代码
<Button
android:id="@+id/StartButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start|bottom"
android:text="@string/Start"
android:padding="10dp"
android:layout_marginBottom="10dp"
android:paddingLeft="10dp"
android:onClick="start"/>
<Button
android:id="@+id/StopButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start|bottom"
android:text="@string/Stop"
android:padding="10dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="107dp"
android:paddingLeft="10dp"
android:onClick="stop"/>
<Button
android:id="@+id/CameraButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:text="@string/Camera"
android:padding="10dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="107dp"
android:paddingRight="10dp"
android:onClick="openCamera"/>
<Button
android:id="@+id/ShareButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:text="@string/Share"
android:padding="10dp"
android:layout_marginBottom="10dp"
android:paddingRight="10dp"/>
</fragment>
这是我的活动 package com.example.name.app;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import android.support.v4.content.ContextCompat;
import com.google.android.gms.maps.GoogleMap.OnMyLocationButtonClickListener;
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;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import android.content.Intent;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.widget.Button;
public class MapsActivity extends AppCompatActivity
implements
OnMyLocationButtonClickListener,
OnMapReadyCallback,
ActivityCompat.OnRequestPermissionsResultCallback { //ERROR on OnRequest...CallBack
/**
* 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;
Button startbutton;
Button stopbutton;
Button sharebutton;
private GoogleMap mMap;
static final int REQUEST_IMAGE_CAPTURE = 1;
static final int REQUEST_TAKE_PHOTO = 1;
String mCurrentPhotoPath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
startbutton= (Button) findViewById(R.id.StartButton);
stopbutton = (Button) findViewById(R.id.StopButton);
sharebutton= (Button) findViewById(R.id.ShareButton);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Venice, Italy, and move the camera.
/* LatLng venice = new LatLng(45.43, 12.33);
mMap.addMarker(new MarkerOptions().position(venice).title("Marker in Venice"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(venice));*/
mMap.setOnMyLocationButtonClickListener(this);
enableMyLocation();
}
private void enableMyLocation() {
//ERROR CANNOT RESOLVE METHOD checkSelfPermission
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Permission to access the location is missing.
//ERROR CANNOT RESOLVE SYMBOL PermissionUtils
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;
}
//ERROR CANNOT RESOLVE SYMBOL PermissionUtils
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;
}
}
//ERROR CANNOT RESOLVE SYMBOL PermissionUtils
private void showMissingPermissionError() {
PermissionUtils.PermissionDeniedDialog
.newInstance(true).show(getSupportFragmentManager(), "dialog");
}
public void start(View view){
startbutton.setText("Running");
stopbutton.setText("Stop");
}
public void stop(View view){
stopbutton.setText("Stopped");
startbutton.setText("Start");
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
//Get location and store it
File storageDir = new File (Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES)+"/MyMap"); //Saves it in Pictures/MyMapp but can only be viewd from file explorer
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = "file:" + image.getAbsolutePath();
return image;
}
public void openCamera(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
galleryAddPic();
}
}
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
}
这是我的Android清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.name.app" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but are recommended.
-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CAMERA"> </uses-permission>
<uses-feature android:name="android.hardware.camera"
android:required="true" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="@string/google_maps_key" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是我更新的构建gradle 申请插件：＆＃39; com.android.application＆＃39;
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.example.name.app"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.2.0'
compile 'com.google.android.gms:play-services:8.4.0'
compile 'com.android.support:support-v13:23.2.0'
}
答案 0 :(得分：3)
升级：
compileSdkVersion至23 buildToolsVersion至23.0.2 com.android.support:appcompat-v7和com.android.support:support-v13至23.2.0 您遗失的符号来自23.x.y版appcompat-v7;其他变化是保持主要版本同步。
另请注意，7.5.0是play-services的旧版本;我建议将其升级到8.4.0。
并且，请记住，给定targetSdkVersion 22时，所有运行时权限都是毫无意义的。
答案 1 :(得分：1)
我有类似的问题想知道为什么无法找到PermissionUtil类。可以在Github的googlemap / android-maps示例（https://github.com/googlemaps/android-samples/blob/master/ApiDemos/app/src/main/java/com/example/mapdemo/PermissionUtils.java）找到该类。我只是创建了一个java文件，复制了代码并替换了字符串资源。