从图库中选取图像会出现错误 Android N

Question

我无法从 Android N 中的意图检索 Uri。据我所知，在 Android 24 及更高版本上，要获得外部 Uri，您需要在 Manifest 中声明 FileProvider。这一切都完成了，它可以与相机一起使用，但是当我尝试从图库中获取图像时，我在 onActivityResult data.getData();

中遇到错误

这些是我的代码示例：

public void getPictureFromGallery(){
    picUriCar = null;
    try {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        startActivityForResult(intent, PIC_SELECT);
    } catch (ActivityNotFoundException e) {
        Toast.makeText(MainActivity.this, getResources().getString(R.string.text_error_no_gallery_app),
                Toast.LENGTH_SHORT).show();
    }
}

和onActivityResult：

else if(requestCode == PIC_SELECT){
     picUriCar = data.getData();
     if (picUriCar != null){
         performCrop();
     }
}

据我所知 data.getData() returns 一个 Uri，这在 Marshmallow 上工作正常，但在 Nougat phone 上我得到这个错误：

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=5, result=-1, data=Intent { dat=content://com.android.externalstorage.documents/document/4996-1EFF:DCIM/100ANDRO/DSC_0004.JPG flg=0x1 }} to activity {com.company.example/com.company.example.MainActivity}: java.lang.SecurityException: Uid 10246 does not have permission to uri 0 @ content://com.android.externalstorage.documents/document/4996-1EFF%3ADCIM%2F100ANDRO%2FDSC_0004.JPG at android.app.ActivityThread.deliverResults(ActivityThread.java:4267) at android.app.ActivityThread.handleSendResult(ActivityThread.java:4310) at android.app.ActivityThread.-wrap20(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1628) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:203) at android.app.ActivityThread.main(ActivityThread.java:6361) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924) Caused by: java.lang.SecurityException: Uid 10246 does not have permission to uri 0 @ content://com.android.externalstorage.documents/document/4996-1EFF%3ADCIM%2F100ANDRO%2FDSC_0004.JPG at android.os.Parcel.readException(Parcel.java:1683) at android.os.Parcel.readException(Parcel.java:1636) at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3213) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1525) at android.app.Activity.startActivityForResult(Activity.java:4235) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:767) at android.app.Activity.startActivityForResult(Activity.java:4194) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:754) at com.company.example.MainActivity.performCrop(MainActivity.java:1654) at com.company.example.MainActivity.onActivityResult(MainActivity.java:1534) at android.app.Activity.dispatchActivityResult(Activity.java:6928) at android.app.ActivityThread.deliverResults(ActivityThread.java:4263) at android.app.ActivityThread.handleSendResult(ActivityThread.java:4310) at android.app.ActivityThread.-wrap20(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1628) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:203) at android.app.ActivityThread.main(ActivityThread.java:6361) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)

我的问题是：如何在没有任何错误的情况下将 data.getData() uri 传递给 picUriCar？

Answer 1

使用此代码创建选择图像的新意图：

Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        intent.setType(image/*);
        startActivityForResult(Intent.createChooser(intent, ""), Constants.SELECT_PICTURE);

在onActivityResult中使用此代码：

if (resultCode == Activity.RESULT_OK) {
        if (requestCode == Constants.SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            try {
                if (isNewGooglePhotosUri(selectedImageUri)) {
                    resultFile = getPhotoFile(selectedImageUri);
                } else {
                    resultFile = getFilePathForGallery(selectedImageUri);
                }
                if (resultFile == null) {
                    //error
                    return;
                }
            } catch (Exception e) {
                e.printStackTrace();
                //error
                return;
            }
        }
    }
}

这里还有一些我在代码中使用的有用函数：

private File getFilePathForGallery(Uri contentUri) {
        String path = null;
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
        if (cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            path = cursor.getString(column_index);
        }
        cursor.close();
        return new File(path);
    }

  public static boolean isNewGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.contentprovider".equals(uri.getAuthority());
    }

private File getPhotoFile(Uri selectedImageUri) {
        try {
            InputStream is = mActivityInstance.getContentResolver().openInputStream(selectedImageUri);
            if (is != null) {
                Bitmap pictureBitmap = BitmapFactory.decodeStream(is);
                ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                pictureBitmap.compress(Bitmap.CompressFormat.JPEG, 80, bytes);
                File output = new File(FileManager.getImageCacheDir(mActivityInstance), System.currentTimeMillis() + ".jpg");
                output.createNewFile();
                FileOutputStream fo = new FileOutputStream(output);
                fo.write(bytes.toByteArray());
                fo.close();
                return output;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

FileManager 中的函数 class:

private static File getCacheDir(Context context) {
        File cacheDir = context.getExternalFilesDir(null);
        if (cacheDir != null) {
            if (!cacheDir.exists())
                cacheDir.mkdirs();
        } else {
            cacheDir = context.getCacheDir();
        }
        return cacheDir;
    }

     public static File getImageCacheDir(Context context) {
        File imageCacheDir = new File(getCacheDir(context), "cache_folder");
        if (!imageCacheDir.exists())
            imageCacheDir.mkdirs();
        return imageCacheDir;
    }

您还需要在 xml 文件夹中创建新的 xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path
        name="external_files"
        path="." />
</paths>

然后将新的 provider 添加到清单文件：

 <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/your_xml_file" />
        </provider>

Answer 2

我做了一些检查，一如既往，解决方案比我预期的要简单。这是我的 performCrop 函数。单击视图时，我有两个选项。从图库中获取图像或使用相机捕捉图像。我记得画廊选项问题是在我修复相机问题后才出现的。所以问题可能出在作物代码中的某个地方。这就是我所做的：

public void performCrop(boolean cameraShot){
            try {
                Intent cropIntent = new Intent("com.android.camera.action.CROP");
                //indicate image type and Uri
                //cropIntent.setDataAndType(picUri, "image");
                cropIntent.setDataAndType(picUriCar, "image/*");
                //set crop properties
                cropIntent.putExtra("crop", "true");
                //indicate aspect of desired crop
                cropIntent.putExtra("aspectX", 2);
                cropIntent.putExtra("aspectY", 1);
                //indicate output X and Y
                cropIntent.putExtra("outputX", 1024);
                cropIntent.putExtra("outputY", 512);
                cropIntent.putExtra("scale", true);
                cropIntent.putExtra("return-data", false);

                Uri uri;
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N || !cameraShot) {
                    uri = Uri.fromFile(croppedFileCar);
                }else{
                    String authority = "com.company.example.provider";
                    uri = FileProvider.getUriForFile(
                            MainActivity.this,
                            authority,
                            croppedFileCar);
                    cropIntent.setClipData(ClipData.newRawUri( "", uri ) );
                    cropIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                }

Please notice - if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N || !cameraShot)

所以基本上它背后的逻辑是，如果图像不是由相机提供的（在onActivityResult中确定）或者API低于24，执行行：

uri = Uri.fromFile(croppedFileCar);

否则使用 FileProvider。在我进行这些更改之前，应用程序在从图库中选择图像时崩溃了。我不知道为什么它现在有效，但如果有人知道答案，我会很高兴听到。

从图库中选取图像会出现错误 Android N

Picking an image from gallery gives error Android N

java

permissions

android

exception

android-7.0-nougat