Question

我正在开发一个简单的Android照片上传器。我有一个画廊活动，在那里我可以选择图片。之后我发送带路径的图像名称，因为我需要显示它们。

如何使用这些名称制作文件并指向上传的实际图像？

  String[] picturesWithPath = new String[arrPath.size()];
  for (int z = 0; z < arrPath.size(); z++)
    {
        picturesWithPath[z] = arrPath.get(z);

        Log.i("data","with path: "+picturesWithPath[z]);
    }

Answer 1

使用以下代码获取文件URL。

  //use this in yorr for loop
  picturesWithPath[z] = getPath(Yourclass.this, arrPath.get(z));



 public static String getPath(final Context context, final Uri uri) {

// check here to KITKAT or new version
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {

    // ExternalStorageProvider
    if (isExternalStorageDocument(uri)) {
        final String docId = DocumentsContract.getDocumentId(uri);
        final String[] split = docId.split(":");
        final String type = split[0];

        if ("primary".equalsIgnoreCase(type)) {
            return Environment.getExternalStorageDirectory() + "/"
                    + split[1];
        }
    }
    // DownloadsProvider
    else if (isDownloadsDocument(uri)) {

        final String id = DocumentsContract.getDocumentId(uri);
        final Uri contentUri = ContentUris.withAppendedId(
                Uri.parse("content://downloads/public_downloads"),
                Long.valueOf(id));

        return getDataColumn(context, contentUri, null, null);
    }
    // MediaProvider
    else if (isMediaDocument(uri)) {
        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] };

        return getDataColumn(context, contentUri, selection,
                selectionArgs);
    }
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

    // Return the remote address
    if (isGooglePhotosUri(uri))
        return uri.getLastPathSegment();

    return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
    return uri.getPath();
}

return null;
}
 public 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 index = cursor.getColumnIndexOrThrow(column);
        return cursor.getString(index);
    }
} finally {
    if (cursor != null)
        cursor.close();
}
return null;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri
        .getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri
        .getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri
        .getAuthority());

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

如何将字符串转换为图像文件

1 个答案: