How can I play a audio file from System.Environment.SpecialFolder.LocalApplicationData in Xamarin Android?
The Error is: Java.IO.IOException: 'setDataSourceFD failed.: status=0x80000000' FD is FileDescriptor? When yes have i to declare it? I've commented him out now, and also in the sample there isn't one....
The file path is consisting of:
string pathToNewFolder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData);
string file = Path.Combine(pathToNewFolder, Path.GetFileName(url));
public void PlayAudioFile(string file, int time)
{
var player = new MediaPlayer();
// var fd = global::Android.App.Application.Context.Assets.OpenFd(file);
player.Prepared += (s, e) =>
{
player.SeekTo(Convert.ToInt32(time));
player.Start();
};
player.Reset();
player.SetDataSource(file);
player.Prepare();
}
This could implemented by dependency service.However,this time I play the mp3 file in Assets folder.I think playing it from System.Environment.SpecialFolder.LocalApplicationData folder is quite similar with my solution.Hope it can shed some light on it.
Step 1: Add IAudio interface to your shared project.
public interface IAudio
{
void PlayAudioFile(string fileName);
}
Step2:In your Android project, add AudioService.cs that implements IAudio interface
[assembly: Dependency(typeof(AudioService))]
namespace AppAudio.Droid
{
public class AudioService : IAudio
{
public AudioService()
{
}
protected MediaPlayer player;
public void PlayAudioFile(string fileName)
{
player = new MediaPlayer();
var fd = global::Android.App.Application.Context.Assets.OpenFd(fileName);
player.Prepared += (s, e) =>
{
player.Start();
};
player.SetDataSource(fd.FileDescriptor, fd.StartOffset, fd.Length);
player.Prepare();
}
}
}
Step3: Call below line to play the mp3 file.
DependencyService.Get<IAudio>().PlayAudioFile("AllSong.mp3");
Last but not least,don't forget to add below permissions in your manifest file.
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Useful link.
Related
I'm developing an app in VS MAUI which is supposed to handle files and subfolders in the Download folder (external card) on an Android. The phones File Manager app reports 3 files in the folder, but my app lists only 1.
var f1 = Directory.GetFiles("/storage/8186-1418/Download");
The listed file has been created by the app itself, using File.WriteAllText, so I know I have access to the folder. The 2 files that aren't listed have been copied from a computer over USB to this folder, so I'm suspecting I'm missing some permissions.
The following permissions have been specified in AndroidManifest.xml:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MANAGE_USB" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" />
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
What do I need to do to see all files?
This is related to the manage_external_storage permission in your file so you need to use the ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent action to direct users to a system settings page where they can enable the following option for your app: Allow access to manage all files.
Firstly, use following code to judge current version and pop a in method of .SnackbarOnCreateMainActivity
public class MainActivity : AppCompatActivity
{
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
if (Android.OS.Build.VERSION.SdkInt >=
Android.OS.BuildVersionCodes.R)
{
if (!Environment.IsExternalStorageManager)
{
Snackbar.Make(FindViewById(Android.Resource.Id.Content),
"Permission needed!", Snackbar.LengthIndefinite)
.SetAction("Settings", new
ClickHandler(this)).Show();
}
}
}
Then you can achieve the ( execute ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent action to direct users to a system settings page) to grand the permission.MyClickHandlerManage_External_Storage
internal class ClickHandler:Java.Lang.Object ,View.IOnClickListener
{
private MainActivity mainActivity;
public ClickHandler()
{
}
public ClickHandler(MainActivity mainActivity)
{
this.mainActivity = mainActivity;
}
public void OnClick(View v)
{
try
{
Uri uri = Uri.Parse("package:" +
Application.Context.ApplicationInfo.PackageName);
Intent intent = new
Intent(Android.Provider.Settings.
ActionManageAppAllFilesAccessPermission,
uri);
mainActivity.StartActivity(intent);
}
catch (Exception ex)
{
Intent intent = new Intent();
intent.SetAction
(Android.Provider.Settings.ActionManageAppAllFilesAccessPermission);
mainActivity.StartActivity(intent);
}
}
}
I am working on an app that is responsible for formatting a USB drive and prepare it for further use on an embedded system.
I am formatting the drive using the following method that I found on stack overflow (unfortunately I did not save the link. I'll post it there if I find it again)
public static bool FormatUSB(string driveLetter, string fileSystem = "FAT32", bool quickFormat = true,
int clusterSize = 4096, string label = "USB_0000", bool enableCompression = false)
{
//add logic to format Usb drive
//verify conditions for the letter format: driveLetter[0] must be letter. driveLetter[1] must be ":" and all the characters mustn't be more than 2
if (driveLetter.Length != 2 || driveLetter[1] != ':' || !char.IsLetter(driveLetter[0]))
return false;
//query and format given drive
//best option is to use ManagementObjectSearcher
var files = Directory.GetFiles(driveLetter);
var directories = Directory.GetDirectories(driveLetter);
foreach (var item in files)
{
try
{
File.Delete(item);
}
catch (UnauthorizedAccessException) { }
catch (IOException) { }
}
foreach (var item in directories)
{
try
{
Directory.Delete(item);
}
catch (UnauthorizedAccessException) { }
catch (IOException) { }
}
ManagementObjectSearcher searcher = new ManagementObjectSearcher(#"select * from Win32_Volume WHERE DriveLetter = '" + driveLetter + "'");
foreach (ManagementObject vi in searcher.Get())
{
try
{
var completed = false;
var watcher = new ManagementOperationObserver();
watcher.Completed += (sender, args) =>
{
Console.WriteLine("USB format completed " + args.Status);
completed = true;
};
watcher.Progress += (sender, args) =>
{
Console.WriteLine("USB format in progress " + args.Current);
};
vi.InvokeMethod(watcher, "Format", new object[] { fileSystem, quickFormat, clusterSize, label, enableCompression });
while (!completed) { System.Threading.Thread.Sleep(1000); }
}
catch
{
}
}
return true;
}
I also added all the capabilities that should be required (I think) in order to access a removable drive in my manifest:
<?xml version="1.0" encoding="utf-8"?>
<Package
xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
xmlns:iot="http://schemas.microsoft.com/appx/manifest/iot/windows10"
IgnorableNamespaces="uap mp rescap iot">
<Identity
Name="7b9becad-6afd-4872-bcb7-7f414c098edf"
Publisher="CN=vitto"
Version="1.0.0.0" />
<mp:PhoneIdentity PhoneProductId="7b9becad-6afd-4872-bcb7-7f414c098edf" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
<Properties>
<DisplayName>DiskMakerApp</DisplayName>
<PublisherDisplayName>vitto</PublisherDisplayName>
<Logo>Assets\StoreLogo.png</Logo>
</Properties>
<Dependencies>
<TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
</Dependencies>
<Resources>
<Resource Language="x-generate"/>
</Resources>
<Applications>
<Application Id="App"
Executable="$targetnametoken$.exe"
EntryPoint="DiskMakerApp.App">
<uap:VisualElements
DisplayName="DiskMakerApp"
Square150x150Logo="Assets\Square150x150Logo.png"
Square44x44Logo="Assets\Square44x44Logo.png"
Description="DiskMakerApp"
BackgroundColor="transparent">
<uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
<uap:SplashScreen Image="Assets\SplashScreen.png" />
</uap:VisualElements>
</Application>
</Applications>
<Capabilities>
<rescap:Capability Name="broadFileSystemAccess" />
<rescap:Capability Name="appCaptureSettings" />
<Capability Name="internetClient" />
<uap:Capability Name="removableStorage" />
<iot:Capability Name="systemManagement"/>
<DeviceCapability Name="usb"/>
</Capabilities>
</Package>
And also allowed access to the file system in Window's settings page:
But I am still getting:
I am wondering if I am missing anything. Is there a way I could run the app as an administrator^ Would that solve the issue? (In any case, only admins would be able to run that app in a real life scenario)
UWP application unable to access USB drive even though permissions are set
Directory.GetFiles can't not use to access file with path in UWP platform. And you can only use Windows Storage API to access file with path (enable broadFileSystemAccess ), by the way, System.Management Namespace is not work for UWP platform, and if you want to format USB device within UWP app, please use desktop extension to process. for more please refer stefan' blog UWP with Desktop Extension
Unity 2018.4.15. Build project for Android platform with error:
CommandInvokationFailure: Gradle build failed. J:\Program
Files\2018.4.15f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\OpenJDK\Windows\bin\java.exe
-classpath "J:\Program Files\2018.4.15f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-5.1.1.jar"
org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m"
"assembleRelease"
stderr[ D8: Program type already present:
com.android.installreferrer.api.InstallReferrerClient$1
FAILURE: Build failed with an exception.
What went wrong: Execution failed for task ':transformDexArchiveWithExternalLibsDexMergerForRelease'.
There is only one lib with name "installreferrer-1.0.aar" in Assets/Plugins/Android/ folder. I use Facebook plugin (7.18.0), GoogleMobileAds (4.2.1), Applovin SDK (9.11.1) with Facebook mediation (5.6.1.0).
If I deleted installreferrer-1.0.aar - project compile ok, but it crashes after running on device. If I rollback library & delete the Facebook plugin the project compiles ok, but crashes as well. I think that FB connect is causing my error, but I cannot resolve it.
Manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.unity3d.player" xmlns:tools="http://schemas.android.com/tools" android:installLocation="preferExternal">
<supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" />
<application android:theme="#style/UnityThemeSelector" android:icon="#mipmap/app_icon" android:label="#string/app_name" android:networkSecurityConfig="#xml/network_security_config"
android:name="android.support.multidex.MultiDexApplication" tools:replace="android:icon">
<activity android:name="com.unity3d.player.UnityPlayerActivity" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="unityplayer.UnityActivity" android:value="true" />
</activity>
<activity android:name="com.facebook.unity.FBUnityLoginActivity" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:theme="#android:style/Theme.Translucent.NoTitleBar.Fullscreen" />
<activity android:name="com.facebook.unity.FBUnityDialogsActivity" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:theme="#android:style/Theme.Translucent.NoTitleBar.Fullscreen" />
<activity android:name="com.facebook.unity.FBUnityAppLinkActivity" android:exported="true" />
<activity android:name="com.facebook.unity.FBUnityDeepLinkingActivity" android:exported="true" />
<activity android:name="com.facebook.unity.FBUnityGameRequestActivity" />
<activity android:name="com.facebook.unity.FBUnityCreateGameGroupActivity" />
<activity android:name="com.facebook.unity.FBUnityJoinGameGroupActivity" />
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="fb2575328535843348" />
<meta-data android:name="com.facebook.sdk.AutoLogAppEventsEnabled" android:value="true" />
<meta-data android:name="com.facebook.sdk.AdvertiserIDCollectionEnabled" android:value="true" />
<provider android:name="com.facebook.FacebookContentProvider" android:authorities="com.facebook.app.FacebookContentProvider2575328535843348" android:exported="true" />
<receiver android:name="com.appsflyer.SingleInstallBroadcastReceiver" android:exported="true">
<intent-filter>
<action android:name="com.android.vending.INSTALL_REFERRER" />
</intent-filter>
</receiver>
</application>
<uses-permission android:name="com.android.vending.BILLING" />
</manifest>
mainTeplate.gradle
// GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAIN
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.0'
**BUILD_SCRIPT_DEPS**}
}
allprojects {
repositories {
google()
jcenter()
flatDir {
dirs 'libs'
}
}
}
// Android Resolver Repos Start
([rootProject] + (rootProject.subprojects as List)).each {
ext {
it.setProperty("android.useAndroidX", true)
it.setProperty("android.enableJetifier", true)
}
}
([rootProject] + (rootProject.subprojects as List)).each { project ->
project.repositories {
def unityProjectPath = $/file:///**DIR_UNITYPROJECT**/$.replace("\\", "/")
maven {
url "https://maven.google.com"
}
maven {
url "https://maven.google.com/" // Assets/GoogleMobileAds/Editor/GoogleMobileAdsDependencies.xml:7
}
maven {
url "https://adcolony.bintray.com/AdColony" // Assets/MaxSdk/Mediation/AdColony/Editor/Dependencies.xml:8
}
maven {
url "https://applovin.bintray.com/Android-Adapter-SDKs" // Assets/MaxSdk/Mediation/Fyber/Editor/Dependencies.xml:8, Assets/MaxSdk/Mediation/IronSource/Editor/Dependencies.xml:8
}
maven {
url "https://s3.amazonaws.com/smaato-sdk-releases/" // Assets/MaxSdk/Mediation/Smaato/Editor/Dependencies.xml:8
}
mavenLocal()
jcenter()
mavenCentral()
}
}
// Android Resolver Repos End
apply plugin: 'com.android.application'
**APPLY_PLUGINS**
dependencies {
implementation 'com.android.support:multidex:1.0.1'
implementation fileTree(dir: 'libs', include: ['*.jar'])
// Android Resolver Dependencies Start
implementation 'com.android.support:appcompat-v7:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
implementation 'com.android.support:appcompat-v7:28.+' // Assets/MaxSdk/Mediation/Facebook/Editor/Dependencies.xml:10
implementation 'com.android.support:cardview-v7:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
implementation 'com.android.support:customtabs:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
implementation 'com.android.support:recyclerview-v7:28.+' // Assets/MaxSdk/Mediation/Facebook/Editor/Dependencies.xml:9
implementation 'com.android.support:support-v4:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
implementation 'com.applovin.mediation:adcolony-adapter:4.1.2.1' // Assets/MaxSdk/Mediation/AdColony/Editor/Dependencies.xml:8
implementation 'com.applovin.mediation:facebook-adapter:[5.6.1.0]' // Assets/MaxSdk/Mediation/Facebook/Editor/Dependencies.xml:8
implementation 'com.applovin.mediation:fyber-adapter:7.5.0.0' // Assets/MaxSdk/Mediation/Fyber/Editor/Dependencies.xml:8
implementation 'com.applovin.mediation:google-adapter:[17.2.1.7]' // Assets/MaxSdk/Mediation/Google/Editor/Dependencies.xml:5
implementation 'com.applovin.mediation:ironsource-adapter:6.13.0.1.0' // Assets/MaxSdk/Mediation/IronSource/Editor/Dependencies.xml:8
implementation 'com.applovin.mediation:mintegral-adapter:10.1.51.2' // Assets/MaxSdk/Mediation/Mintegral/Editor/Dependencies.xml:4
implementation 'com.applovin.mediation:smaato-adapter:21.3.1.0' // Assets/MaxSdk/Mediation/Smaato/Editor/Dependencies.xml:8
implementation 'com.applovin.mediation:tapjoy-adapter:12.4.0.0' // Assets/MaxSdk/Mediation/Tapjoy/Editor/Dependencies.xml:4
implementation 'com.applovin.mediation:unityads-adapter:3.4.0.1' // Assets/MaxSdk/Mediation/UnityAds/Editor/Dependencies.xml:4
implementation 'com.applovin:applovin-sdk:9.11.1' // Assets/MaxSdk/AppLovin/Editor/Dependencies.xml:4
implementation 'com.facebook.android:facebook-applinks:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:6
implementation 'com.facebook.android:facebook-core:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:5
implementation 'com.facebook.android:facebook-login:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:7
implementation 'com.facebook.android:facebook-share:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:8
implementation 'com.google.android.gms:play-services-ads:18.2.0' // Assets/GoogleMobileAds/Editor/GoogleMobileAdsDependencies.xml:7
implementation 'com.google.android.gms:play-services-ads-identifier:[16.0.0]' // Assets/MaxSdk/AppLovin/Editor/Dependencies.xml:5
implementation 'com.parse.bolts:bolts-android:1.4.0' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:4
// Android Resolver Dependencies End
**DEPS**}
// Android Resolver Exclusions Start
android {
packagingOptions {
exclude ('/lib/armeabi/*' + '*')
exclude ('/lib/mips/*' + '*')
exclude ('/lib/mips64/*' + '*')
exclude ('/lib/x86/*' + '*')
exclude ('/lib/x86_64/*' + '*')
}
}
// Android Resolver Exclusions End
android {
compileSdkVersion **APIVERSION**
buildToolsVersion '**BUILDTOOLS**'
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
defaultConfig {
multiDexEnabled true
minSdkVersion **MINSDKVERSION**
targetSdkVersion **TARGETSDKVERSION**
applicationId '**APPLICATIONID**'
ndk {
abiFilters **ABIFILTERS**
}
versionCode **VERSIONCODE**
versionName '**VERSIONNAME**'
}
dexOptions {
javaMaxHeapSize "16g"
}
lintOptions {
abortOnError false
}
aaptOptions {
noCompress = ['.unity3d', '.ress', '.resource', '.obb'**STREAMING_ASSETS**]
}**SIGN**
buildTypes {
debug {
minifyEnabled **MINIFY_DEBUG**
useProguard **PROGUARD_DEBUG**
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'**USER_PROGUARD**
jniDebuggable true
}
release {
minifyEnabled **MINIFY_RELEASE**
useProguard **PROGUARD_RELEASE**
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'**USER_PROGUARD****SIGNCONFIG**
}
}**PACKAGING_OPTIONS****SPLITS**
**BUILT_APK_LOCATION**
bundle {
language {
enableSplit = false
}
density {
enableSplit = false
}
abi {
enableSplit = true
}
}
}**SPLITS_VERSION_CODE****REPOSITORIES****SOURCE_BUILD_SETUP**
Change your Facebook android dependencies from "[5,6)" to "5.13.0". This was included into your mainTemplate.gradle from file
Assets/FacebookSDK/Plugins/Editor/Dependencies.xml
Resolve problem:
Remove FB plugin, FB Mediation from project and manifest
Exit from Unity
Remove Library folder
Launch Unity and compile without FB!
Install FB
Change your Facebook android dependencies from "[5,6)" to "5.13.0"
Assets -> GooglePlayResolver -> Android Resolver -> Settings -> Force Resolve
Profit!
I want to stream webm (opus) audio in my Xamarin Android App but I keep getting a UNKNOWN_ERROR by preparing the player.
My code looks like that:
public class AndroidAudioPlayerHelper : AudioPlayerHelper {
private readonly Media Player player;
public AndroidAudioPlayerHelper() => player = new MediaPlayer();
private void PlayNew() {
player.Prepared += (sender, e) => {
player.Start();
};
player.PrepareAsync();
}
public override void PlayStream(string url) {
player.SetDataSource(url);
PlayNew();
}
}
My url looks like http://localhost:9001/api/v1/song/stream/00000000000000000000000000000000.
And everything is working fine when I point on a mp3-file or use my UWP-App.
I already tried to set AudioAttributes but it didn't work either.
If you are using a newer version of Android, your resource has to be a https resource, or allow insecure connections in your manifest.
Try adding: android:usesCleartextTraffic="true" to your Application node in your AndroidManifest.xml file.
This should preferably be disabled for release builds when you have a properly configured server.
I want to open a PDF on the Phone via the File-Path but i cant figure out how i could do this properly without using 3rd party packages.
You have any suggestion for this?
I already tried to use this on Android:
public void OpenFile(string filePath)
{
var fileToOpen = new Java.IO.File(filePath);
var uri = FileProvider.GetUriForFile(Application.Context, Application.Context.PackageName + ".fileprovider", fileToOpen);
var intent = new Intent();
var mime = IOUtil.GetMimeType(uri.ToString());
intent.SetAction(Intent.ActionView);
intent.SetDataAndType(uri, mime);
intent.SetFlags(ActivityFlags.NewTask);
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
Application.Context.StartActivity(intent);
}
But i get the following Error:
Unhandled Exception:
Java.Lang.NullPointerException: Attempt to invoke virtual method
'android.content.res.XmlResourceParser
android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager,
java.lang.String)' on a null object reference
first you should addd this code to your manifest file :
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.easyphotopicker.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
tools:replace="android:authorities">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="#xml/filepaths"
tools:replace="android:resource"/>
</provider>
and create filepaths :
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<root-path name="root" path="" /> //root directory of the device new File("/");
<files-path name="files" path="" /> //context.getFilesDir()
<cache-path name="cache" path="" /> //context.getCacheDir()
<external-path name="external" path="" /> //Environment.getExternalStorageDirectory()
<external-files-path name="name" path="path" /> //context.getExternalFilesDirs()
<external-cache-path name="name" path="path" /> //getExternalCacheDirs()
</paths>
Your error is telling us that there is no file at the location matching that's passed into the function. There's a few ways of doing this, one of them is as shown. After accepting permissions to access folders and files, this should be one of the simplest ways. You seem to be close:
public void OpenPdfFile(string filename)
{
var f = new Java.IO.File(filename);
if (f.Exists())
{
System.Diagnostics.Debug.WriteLine("File exists!");
try
{
var openFileIntent = new Intent(Intent.ActionView);
openFileIntent.SetDataAndType(Android.Net.Uri.FromFile(f), "application/pdf");
openFileIntent.SetFlags(ActivityFlags.NoHistory);
StartActivity(Intent.CreateChooser(openFileIntent, "Open pdf file"));
}
catch (ActivityNotFoundException)
{
//handle when no available apps
}
}
}
I haven't tested your work, but the first thing would be to see if you added this to the Manifest file
android:authorities="com.{package}.{name}.fileprovider"
since your code says Application.Context.PackageName + ".fileprovider"