Android中Uri和Path之间的转换

Android Uri to Path

现在遇到的常规Uri有两种:

• 媒体文件的Uri是content://, 表示这是一个数据库数据。去数据库查询正常返回

• 其他的文件Uri是file://, 表示这个是一个文件。这个uri是通过Uri.fromFile(File file)方法生成。

直接上代码

package com.xinmang.videoeffect.utils;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;

import com.xinmang.videoeffect.app.MainApplication;

import java.io.File;

public class UriTool {
    public static String getFilePathByUri(Context context, Uri uri) {
        String path = null;
        String scheme = uri.getScheme();

        // 以 file:// 开头的
        if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
            path = uri.getPath();
            return path;
        }
        // 以 content:// 开头的，比如 content://media/extenral/images/media/17766
        if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
            if (cursor != null) {
                if (cursor.moveToFirst()) {
                    int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                    if (columnIndex > -1) {
                        path = cursor.getString(columnIndex);
                    }
                }
                cursor.close();
            }
            return path;
        }
        // 4.4及之后的 是以 content:// 开头的，比如 content://com.android.providers.media.documents/document/image%3A235700
        if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            if (DocumentsContract.isDocumentUri(context, uri)) {
                if (isExternalStorageDocument(uri)) {
                    // ExternalStorageProvider
                    final String docId = DocumentsContract.getDocumentId(uri);
                    final String[] split = docId.split(":");
                    final String type = split[0];
                    if ("primary".equalsIgnoreCase(type)) {
                        path = Environment.getExternalStorageDirectory() + "/" + split[1];
                        return path;
                    }
                } else if (isDownloadsDocument(uri)) {
                    // DownloadsProvider
                    final String id = DocumentsContract.getDocumentId(uri);
                    final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
                            Long.valueOf(id));
                    path = getDataColumn(context, contentUri, null, null);
                    return path;
                } else if (isMediaDocument(uri)) {
                    // MediaProvider
                    final String docId = DocumentsContract.getDocumentId(uri);
                    final String[] split = docId.split(":");
                    final String type = split[0];
                    Uri contentUri = null;
                    if ("image".equals(type)) {
                        contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                    } else if ("video".equals(type)) {
                        contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                    } else if ("audio".equals(type)) {
                        contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                    }
                    final String selection = "_id=?";
                    final String[] selectionArgs = new String[]{split[1]};
                    path = getDataColumn(context, contentUri, selection, selectionArgs);
                    return path;
                }
            } else if ("content".equalsIgnoreCase(uri.getScheme())) {
                // Return the remote address
                if (isGooglePhotosUri(uri))
                    return uri.getLastPathSegment();

                if (isQQMediaDocument(uri)) {
                    String paths = uri.getPath();
                    File fileDir = Environment.getExternalStorageDirectory();
                    File file = new File(fileDir, paths.substring("/QQBrowser".length(), paths.length()));
                    return file.exists() ? file.toString() : null;
                }

                return getDataColumn(context, uri, null, null);
            } else if ("file".equalsIgnoreCase(uri.getScheme())) {
                return uri.getPath();
            }
            else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
                //微信文件打开的uri
                path = uri.getPath();
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N
                        && path != null && path.startsWith("/external")) {
                    return new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                            + path.replace("/external", "")).getPath();
                } else {
                    String[] paths = uri.getPath().split("/0/");
                    if (paths.length == 2) {
                        return Environment.getExternalStorageDirectory() + "/" + paths[1];
                    }
                }
            } else {
                String[] paths = uri.getPath().split("/0/");
                if (paths.length == 2) {
                    return Environment.getExternalStorageDirectory() + "/" + paths[1];
                }

            }
        }
        return null;
    }

    private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    private static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }


    public static Uri PathToUri(String path){
        Uri uri;
        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
            uri = Uri.fromFile(new File(path));
        } else {
            /**
             * 7.0 调用系统相机拍照不再允许使用Uri方式，应该替换为FileProvider
             * 并且这样可以解决MIUI系统上拍照返回size为0的情况
             */
            uri = FileProvider.getUriForFile(MainApplication.getInstance(),  "com.xinmang.videoeffect.fileprovider", new File(path));
        }

        return uri;
    }
 /**
     * 使用第三方qq文件管理器打开
     *
     * @param uri
     * @return
     */
    public static boolean isQQMediaDocument(Uri uri) {
        return "com.tencent.mtt.fileprovider".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }
}