Tries to obtain File containing taken photo. - Android App

Android examples for App:Local Storage

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Description

Tries to obtain File containing taken photo.

Demo Code


//package com.java2s;

import android.content.ContentResolver;

import android.content.Context;

import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;

import android.provider.MediaStore;
import java.io.File;

public class Main {
    private static final String[] PROJECTION = new String[] { MediaStore.MediaColumns.DATA };
    private static final String PHOTO_SHARED_PREFS_NAME = "photo_shared";
    private static final String PHOTO_URI = "photo_uri";

    /**/* w  w w .j a v a 2 s .c o m*/
     * Tries to obtain File containing taken photo. Perform cleanups if photo was not taken or it is empty.
     * @param caller caller Activity
     * @param photoKey key in Shared Preferences for taken image, can be null
     * @return File containing photo or null if no or empty photo was saved by camera app.
     */
    public static File retrievePhotoResult(Context caller, String photoKey) {
        try {
            if (photoKey == null) {
                photoKey = PHOTO_URI;
            }
            SharedPreferences prefs = caller.getSharedPreferences(
                    PHOTO_SHARED_PREFS_NAME, Context.MODE_PRIVATE);
            String takenPhotoUriString = prefs.getString(photoKey, null);
            prefs.edit().remove(photoKey).commit();

            if (takenPhotoUriString == null) {
                return null;
            }

            Uri takenPhotoUri = Uri.parse(takenPhotoUriString);
            ContentResolver cr = caller.getContentResolver();
            File out = new File(getPhotoFilePath(takenPhotoUri, cr));
            if (!out.isFile() || (out.length() == 0)) {
                cr.delete(takenPhotoUri, null, null);
            } else {
                return out;
            }
        } catch (Exception ex) {
            // no-op
        }
        return null;
    }

    private static String getPhotoFilePath(Uri takenPhotoUri,
            ContentResolver cr) {
        Cursor cursor = cr.query(takenPhotoUri, PROJECTION, null, null,
                null);
        String res = null;
        if (cursor != null) {
            int dataIdx = cursor
                    .getColumnIndex(MediaStore.MediaColumns.DATA);
            if (dataIdx >= 0 && cursor.moveToFirst())
                res = cursor.getString(dataIdx);
            cursor.close();
        }
        return res;
    }
}

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