如何从 Android Lollipop 中的 URI 获取图像的文件路径？

Question

我想为 Android Lollipop 创建一个图像选择器。我使用Intent.ACTION_GET_CONTENT 选择我的图片，但我无法从对话框选择器返回的 URI 中获取所选图片的路径。

我尝试了这些线程的代码：

retrieve absolute path when select image from gallery kitkat android

https://chintankhetiya.wordpress.com/2013/12/14/picture-selection-from-camera-gallery/

但它们都返回 null。谁能帮帮我？

Answer 1

试试

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.CursorLoader;
import android.database.Cursor;
import android.net.Uri;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class RealPathUtil {
    @SuppressLint("NewApi")
    public static String getRealPathFromURI_API19(Context context, Uri uri) {
        Log.variable("uri", uri.getPath());
        String filePath = "";
        if (DocumentsContract.isDocumentUri(context, uri)) {
            String wholeID = DocumentsContract.getDocumentId(uri);
            Log.variable("wholeID", wholeID);
// Split at colon, use second item in the array
            String[] splits = wholeID.split(":");
            if (splits.length == 2) {
                String id = splits[1];

                String[] column = {MediaStore.Images.Media.DATA};
// where id is equal to
                String sel = MediaStore.Images.Media._ID + "=?";
                Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        column, sel, new String[]{id}, null);
                int columnIndex = cursor.getColumnIndex(column[0]);
                if (cursor.moveToFirst()) {
                    filePath = cursor.getString(columnIndex);
                }
                cursor.close();
            }
        } else {
            filePath = uri.getPath();
        }
        return filePath;
    }

    @SuppressLint("NewApi")
    public static String getRealPathFromURI_API11to18(Context context, Uri contentUri) {
        String[] proj = {MediaStore.Images.Media.DATA};
        String result = null;
        CursorLoader cursorLoader = new CursorLoader(
                context,
                contentUri, proj, null, null, null);
        Cursor cursor = cursorLoader.loadInBackground();
        if (cursor != null) {
            int column_index =
                    cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            result = cursor.getString(column_index);
        }
        return result;
    }

    public static String getRealPathFromURI_BelowAPI11(Context context, Uri contentUri) {
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        int column_index
                = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }

并使用：

private String uriToFilename(Uri uri) {
    String path = null;

    if (Build.VERSION.SDK_INT < 11) {
        path = RealPathUtil.getRealPathFromURI_BelowAPI11(mContext, uri);
    } else if (Build.VERSION.SDK_INT < 19) {
        path = RealPathUtil.getRealPathFromURI_API11to18(mContext, uri);
    } else {
        path = RealPathUtil.getRealPathFromURI_API19(mContext, uri);
    }

    return path;
}

在必须的情况下为我工作（not works 用于下载应用程序）

Answer 2

试试这个小功能：

public static String getRealPathFromUri(Uri uri) {
    String result = "";
    String documentID;
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
        String[] pathParts = uri.getPath().split("/");
        documentID = pathParts[pathParts.length - 1];
    } else {
        String pathSegments[] = uri.getLastPathSegment().split(":");
        documentID = pathSegments[pathSegments.length - 1];
    }
    String mediaPath = MediaStore.Images.Media.DATA;
    Cursor imageCursor = getContentResolver().query(uri, new String[]{mediaPath}, MediaStore.Images.Media._ID + "=" + documentID, null, null);
    if (imageCursor.moveToFirst()) {
        result = imageCursor.getString(imageCursor.getColumnIndex(mediaPath));
    }
    return result;
}

Answer 3

这对我有用。

我创建了一个 Util 类RealPathUtil（与@Artem 答案中的类有一些细微差别）：

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.CursorLoader;
import android.database.Cursor;
import android.net.Uri;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class RealPathUtil {

    @SuppressLint("NewApi")
    public static String getRealPathFromURI_API19(Context context, Uri uri) {
        String filePath = "";
        String wholeID = DocumentsContract.getDocumentId(uri);

        // Split at colon, use second item in the array
        String id = wholeID.split(":")[1];

        String[] column = { MediaStore.Images.Media.DATA };

        // where id is equal to
        String sel = MediaStore.Images.Media._ID + "=?";

        Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                column, sel, new String[]{ id }, null);

        assert cursor != null;
        int columnIndex = cursor.getColumnIndex(column[0]);

        if (cursor.moveToFirst()) {
            filePath = cursor.getString(columnIndex);
        }
        cursor.close();
        return filePath;
    }


    @SuppressLint("NewApi")
    public static String getRealPathFromURI_API11to18(Context context, Uri contentUri) {
        String[] proj = { MediaStore.Images.Media.DATA };
        String result = null;

        CursorLoader cursorLoader = new CursorLoader(
                context,
                contentUri, proj, null, null, null);
        Cursor cursor = cursorLoader.loadInBackground();

        if(cursor != null){
            int column_index =
                    cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            result = cursor.getString(column_index);
        }
        return result;
    }

    public static String getRealPathFromURI_BelowAPI11(Context context, Uri contentUri){
        Cursor cursor = null;

        try {
            String[] proj = { MediaStore.Images.Media.DATA };
            cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
            assert cursor != null;
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
    }

}

然后，在我的应用代码中，我使用了：

private String getPathFromUri(Uri uri) {
    if (Build.VERSION.SDK_INT < 11)
        return RealPathUtil.getRealPathFromURI_BelowAPI11(getContext(), uri);
    else if (Build.VERSION.SDK_INT < 19)
        return RealPathUtil.getRealPathFromURI_API11to18(getContext(), uri);
    else
        return RealPathUtil.getRealPathFromURI_API19(getContext(), uri);
}

Answer 4

确保您在 Android 清单中授予权限！

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />