Opens the content URI for reading, and returns the file descriptor to the caller. - Android Phone

Android examples for Phone:Phone Call

  1. HOME
  2. Android
  3. Phone
  4. Phone Call

Description

Opens the content URI for reading, and returns the file descriptor to the caller.

Demo Code

// Copyright 2013 The Chromium Authors. All rights reserved.
import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.util.Log;

public class Main{
    private static final String TAG = "ContentUriUtils";
    /**/* ww w  . j  a va2  s  .co m*/
     * Opens the content URI for reading, and returns the file descriptor to
     * the caller. The caller is responsible for closing the file desciptor.
     *
     * @param context {@link Context} in interest
     * @param uriString the content URI to open
     * @returns file desciptor upon sucess, or -1 otherwise.
     */
    @CalledByNative
    public static int openContentUriForRead(Context context,
            String uriString) {
        ParcelFileDescriptor pfd = getParcelFileDescriptor(context,
                uriString);
        if (pfd != null) {
            return pfd.detachFd();
        }
        return -1;
    }
    /**
     * Helper method to open a content URI and return the ParcelFileDescriptor.
     *
     * @param context {@link Context} in interest.
     * @param uriString the content URI to open.
     * @returns ParcelFileDescriptor of the content URI, or NULL if the file does not exist.
     */
    private static ParcelFileDescriptor getParcelFileDescriptor(
            Context context, String uriString) {
        ContentResolver resolver = context.getContentResolver();
        Uri uri = Uri.parse(uriString);

        ParcelFileDescriptor pfd = null;
        try {
            pfd = resolver.openFileDescriptor(uri, "r");
        } catch (java.io.FileNotFoundException e) {
            Log.w(TAG, "Cannot find content uri: " + uriString, e);
        }
        return pfd;
    }
}

Related Tutorials