java - 如何从 FileProvider URI 获取真实路径？

Question

我有解码 content:// URI 的代码:

Cursor cursor = null;
try {
    cursor = context.getContentResolver().query(contentUri,
                     new String[] { MediaStore.Files.FileColumns.DATA },
                     null, null, null);

    int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATA);
    cursor.moveToFirst();

    return cursor.getString(columnIndex);

} finally {
    if (cursor != null) {cursor.close()};
}

但它不适用于 FileProvider URI(例如下载文件的 Chrome Dev URI:content://com.chrome.dev.FileProvider/downloads/) .有没有办法得到真实的路径？

Answer 1

您可以尝试使用此解决方案从文件提供程序 URI 获取真实路径。

首先，您需要定义文件提供程序路径文件，如下所示。

provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="/storage/emulated/0" path="."/>
</paths>

在 AndroidMenifest.xml 中声明文件提供程序如下。

AndroidMenifest.xml

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

现在在 Activity 端。

MyActivity.java

private Uri picUri;

    private void takePhotoFromCamera() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (Utils.isNougat()) {
            picUri = FileProvider.getUriForFile(this, getPackageName(), imageHelper
                    .createImageFile());
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        }else {
            picUri = Uri.fromFile(imageHelper.createImageFile());
        }
        intent.putExtra(MediaStore.EXTRA_OUTPUT, picUri);
        startActivityForResult(intent, Const.ServiceCode.TAKE_PHOTO);
    }


    /**
     * This method is used for handel result after captured image from camera .
    */
    private void onCaptureImageResult() {
        if(Utils.isNougat()){
            documentImage = imageHelper.getRealPathFromURI(picUri.getPath());
        }else {
            documentImage = imageHelper.getRealPathFromURI(picUri);
        }
    }

按照我的方法获取真实路径。

public String getRealPathFromURI(Uri contentURI) {
        String result;
        Cursor cursor = context.getContentResolver().query(contentURI, null,
                null, null, null);

        if (cursor == null) { // Source is Dropbox or other similar local file
            // path
            result = contentURI.getPath();
        } else {
            cursor.moveToFirst();
            try {
                int idx = cursor
                        .getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                result = cursor.getString(idx);
            } catch (Exception e) {
                AppLog.handleException(ImageHelper.class.getName(), e);
                Toast.makeText(context, context.getResources().getString(
                        R.string.error_get_image), Toast.LENGTH_SHORT).show();

                result = "";
            }
            cursor.close();
        }
        return result;
    }

希望你能解决你的问题。