我想为我的 xamarin 应用程序使用相机。
我使用以下代码从我的相机拍照。
Intent intent = new Intent(MediaStore.ActionImageCapture);
App._file = new File(App._dir, String.Format("myPhoto.jpg", Guid.NewGuid()));
intent.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(App._file));
StartActivityForResult(intent, 0);
此代码适用于 android 版本 6.0。但是当我在清单 xml 上使用 android 版本 7.0 时不起作用。
请帮帮我...
【问题讨论】：
标签： xamarin.android
简答
imageUri = FileProvider.GetUriForFile(this, "YourPackageName", photoFile);
takePictureIntent.AddFlags(ActivityFlags.GrantReadUriPermission);
长答案
示例代码
using System;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Provider;
using Android.Runtime;
using Android.Support.V4.Content;
using Android.Util;
using DSP.Core.Client.UILogic;
using Java.IO;
using ReadyApps.Xamarin.Framework.Droid;
using ReadyApps.Xamarin.Framework.Droid.Base;
using ReadyApps.Xamarin.Framework.Droid.Controls;
using ReadyApps.Xamarin.Framework.Droid.Helper;
using static ReadyApps.Xamarin.Framework.Droid.Keys.DroidFramePublicKeys;
namespace DSP.Droid.Activities.Orders
{
[Activity(Theme = "@style/ActivityDialog")]
public class ChooseImageActivity : BaseActivity<ChooseImageActivityLogic>
{
private static readonly string TAG = typeof(ChooseImageActivity).Name;
private const int REQUEST_CAMERA = 1001;
private const int SELECT_FILE = 1002;
private string currentFilePath;
private MarshMallowPermission marshMallowPermission;
private ExtTextView openCamera, selectImage;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.ChooseImageActivity);
((MyApplication)Application.Context).OnActivityCreated(this, null);
marshMallowPermission = new MarshMallowPermission(this);
InitView();
}
void InitView()
{
openCamera = FindViewById<ExtTextView>(Resource.Id.openCamera);
selectImage = FindViewById<ExtTextView>(Resource.Id.selectImage);
openCamera.Click += OpenCamera_Click;
selectImage.Click +=SelectImage_Click;
}
void SelectImage_Click(object sender, EventArgs e)
{
if (VersionUtils.isAfter23())
{
if (!marshMallowPermission.checkPermissionForReadExternalStorage())
{
marshMallowPermission.requestPermissionForReadExternalStorage();
}
}
DispatchChoosePictureIntent();
}
void OpenCamera_Click(object sender, EventArgs e)
{
if (VersionUtils.isAfter23())
{
if (!marshMallowPermission.checkPermissionForCamera())
{
marshMallowPermission.requestPermissionForCameraAndStorage();
}
}
DispatchTakePictureIntent();
}
private void DispatchTakePictureIntent()
{
var takePictureIntent = new Intent(MediaStore.ActionImageCapture);
File photoFile = null;
Android.Net.Uri imageUri;
try
{
photoFile = FileUtils.createImageFile();
currentFilePath = "file:" + photoFile.AbsolutePath;
if (VersionUtils.isAfter24())
{
imageUri = FileProvider.GetUriForFile(this, "YourPackageName", photoFile);
takePictureIntent.AddFlags(ActivityFlags.GrantReadUriPermission);
}
else {
imageUri = Android.Net.Uri.FromFile(photoFile);
}
if (photoFile != null && takePictureIntent.ResolveActivity(PackageManager) != null)
{
takePictureIntent.PutExtra(MediaStore.ExtraOutput, imageUri);
StartActivityForResult(takePictureIntent, REQUEST_CAMERA);
}
}
catch (Exception e)
{
Log.Debug(TAG, e.Message);
return;
}
}
private void DispatchChoosePictureIntent()
{
var intent = new Intent(Intent.ActionPick, MediaStore.Images.Media.ExternalContentUri);
intent.SetType("image/*");
StartActivityForResult(Intent.CreateChooser(intent, GetString(Resource.String.select_picture)), SELECT_FILE);
}
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
if (resultCode == Result.Ok)
{
Intent mIntent = new Intent();
Android.Net.Uri imageUri = null;
switch (requestCode) {
case REQUEST_CAMERA:
imageUri = Android.Net.Uri.Parse(currentFilePath);
break;
case SELECT_FILE:
imageUri = data.Data;
break;
}
mIntent.SetData(imageUri);
SetResult(Result.Ok, mIntent);
Finish();
}
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
if (grantResults?.Length> 0 && grantResults[0] == Permission.Granted)
{
switch (requestCode)
{
case CAMERA_Storage_PERMISSION_REQUEST_CODE:
{
DispatchTakePictureIntent();
}
break;
case READ_EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE:
{
DispatchChoosePictureIntent();
}
break;
}
}
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
public override void CleanResources()
{
}
}
}
清单
<provider android:name="android.support.v4.content.FileProvider" android:authorities="YourPackageName" android:exported="false" android:grantUriPermissions="true">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths" />
</provider>
资源 --> xml --> provider_paths.xml
<?xml version="1.0" encoding="UTF-8" ?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
FileUtils --> createImageFile()
public class FileUtils
{
public static File createImageFile()
{
//create an image file name
string timeStamp = DateTime.Now.Ticks.ToString();
string imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Android.OS.Environment.GetExternalStoragePublicDirectory(
Android.OS.Environment.DirectoryPictures);
if (!storageDir.Exists()) {
storageDir.Mkdirs();
}
File image = File.CreateTempFile(
imageFileName,
".jpg",
storageDir
);
// Save a file: path for use with ACTION_VIEW intents
return image;
}
}
VersionUtils --> isAfter24()
public static class VersionUtils
{
public static bool isAfter24()
{
return Build.VERSION.SdkInt >= BuildVersionCodes.N;
}
}
你可以忽略 MarshMallowPermission
【讨论】：