Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.annotation.TargetApi;
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;

public class Main {
    public static final String TYPE_IMAGE = "image";
    public static final String TYPE_VIDEO = "video";
    public static final String TYPE_AUDIO = "audio";

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static String handleKitKatVersion(final Context context, final Uri uri) {
        // ExternalStorageProvider
        if (isExternalStorageDocument(uri)) {
            final String[] split = getMediaData(uri);
            final String type = split[0];

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

            // TODO handle non-primary volumes
        }
        // 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[] split = getMediaData(uri);
            final String type = split[0];

            Uri contentUri = getContentUri(type);

            final String selection = "_id=?";
            final String[] selectionArgs = new String[] { split[1] };
            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static String[] getMediaData(Uri uri) {
        final String docId = DocumentsContract.getDocumentId(uri);
        return docId.split(":");
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    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 column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    private static Uri getContentUri(String type) {
        switch (type) {
        case TYPE_IMAGE:
            return MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        case TYPE_VIDEO:
            return MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
        case TYPE_AUDIO:
            return MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        default:
            return null;
        }
    }
}