lbry-android/app/src/main/java/io/lbry/browser/utils/Helper.java

795 lines
29 KiB
Java

package io.lbry.browser.utils;
import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.text.method.LinkMovementMethod;
import android.view.ContextMenu;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import androidx.core.content.ContextCompat;
import androidx.core.text.HtmlCompat;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.gms.common.util.Hex;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import io.lbry.browser.MainActivity;
import io.lbry.browser.data.DatabaseHelper;
import io.lbry.browser.dialog.ContentFromDialogFragment;
import io.lbry.browser.dialog.ContentSortDialogFragment;
import io.lbry.browser.model.Claim;
import io.lbry.browser.model.LbryFile;
import io.lbry.browser.model.Tag;
import io.lbry.browser.model.UrlSuggestion;
import io.lbry.browser.model.ViewHistory;
import io.lbry.browser.tasks.localdata.SaveUrlHistoryTask;
import io.lbry.browser.tasks.localdata.SaveViewHistoryTask;
import okhttp3.MediaType;
public final class Helper {
public static final String UNKNOWN = "Unknown";
public static final String METHOD_GET = "GET";
public static final String METHOD_POST = "POST";
public static final String ISO_DATE_FORMAT_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS";
public static final String ISO_DATE_FORMAT_JSON = "yyyy-MM-dd'T'HH:mm:ss'Z'";
public static final String SDK_AMOUNT_FORMAT = "0.0#######";
public static final MediaType FORM_MEDIA_TYPE = MediaType.parse("application/x-www-form-urlencoded");
public static final MediaType JSON_MEDIA_TYPE = MediaType.get("application/json; charset=utf-8");
public static final int CONTENT_PAGE_SIZE = 25;
public static final double MIN_DEPOSIT = 0.001;
public static final double MIN_SPEND = 0.0001;
public static final String PLAIN_CURRENCY_FORMAT_PATTERN = "####.##";
public static final String LBC_CURRENCY_FORMAT_PATTERN = "#,###.##";
public static final String FILE_SIZE_FORMAT_PATTERN = "#,###.#";
public static final DecimalFormat LBC_CURRENCY_FORMAT = new DecimalFormat(LBC_CURRENCY_FORMAT_PATTERN);
public static final DecimalFormat FULL_LBC_CURRENCY_FORMAT = new DecimalFormat("#,###.########");
public static final DecimalFormat SIMPLE_CURRENCY_FORMAT = new DecimalFormat("#,##0.00");
public static final SimpleDateFormat FILESTAMP_FORMAT = new SimpleDateFormat("yyyyMMdd_HHmmss");
public static final String EXPLORER_TX_PREFIX = "https://explorer.lbry.com/tx";
public static final List<Double> PLAYBACK_SPEEDS = Arrays.asList(0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0);
public static boolean isNull(String value) {
return value == null;
}
public static boolean isNullOrEmpty(String value) {
return value == null || value.trim().length() == 0;
}
public static void buildPlaybackSpeedMenu(ContextMenu menu) {
int order = 0;
DecimalFormat formatter = new DecimalFormat("0.##");
for (Double speed : PLAYBACK_SPEEDS) {
menu.add(0, Double.valueOf(speed * 100).intValue(), ++order, String.format("%sx", formatter.format(speed)));
}
}
public static String capitalize(String value) {
StringBuilder sb = new StringBuilder();
boolean capitalizeNext = true;
for (char c : value.toCharArray()) {
if (c == ' ') {
capitalizeNext = true;
sb.append(c);
} else {
if (capitalizeNext) {
sb.append(String.valueOf(c).toUpperCase());
} else {
sb.append(c);
}
capitalizeNext = false;
}
}
return sb.toString();
}
public static String join(List<String> list, String delimiter) {
StringBuilder sb = new StringBuilder();
String delim = "";
for (String s : list) {
sb.append(delim).append(s);
delim = delimiter;
}
return sb.toString();
}
public static String joinL(List<Long> list, String delimiter) {
StringBuilder sb = new StringBuilder();
String delim = "";
for (Long item : list) {
sb.append(delim).append(item);
delim = delimiter;
}
return sb.toString();
}
public static <T> JSONArray jsonArrayFromList(List<T> values) {
JSONArray array = new JSONArray();
for (T value : values) {
array.put(value);
}
return array;
}
public static void unregisterReceiver(BroadcastReceiver receiver, Context context) {
if (receiver != null && context != null) {
context.unregisterReceiver(receiver);
}
}
public static void setViewVisibility(View view, int visibility) {
if (view != null) {
view.setVisibility(visibility);
}
}
public static void setViewProgress(ProgressBar progressBar, int progress) {
if (progressBar != null) {
progressBar.setProgress(progress);
}
}
public static void setViewText(TextView view, int stringResourceId) {
if (view != null) {
view.setText(stringResourceId);
}
}
public static void setViewText(TextView view, String text) {
if (view != null) {
view.setText(text);
}
}
public static void closeCursor(Cursor cursor) {
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
}
public static void closeDatabase(SQLiteDatabase db) {
if (db != null) {
db.close();
}
}
public static void closeCloseable(Closeable closeable) {
try {
if (closeable != null) {
closeable.close();
}
} catch (IOException ex) {
// pass
}
}
public static int parseInt(Object value, int defaultValue) {
try {
return Integer.parseInt(String.valueOf(value), 10);
} catch (NumberFormatException ex) {
return defaultValue;
}
}
public static Double parseDouble(Object value, double defaultValue) {
try {
return Double.parseDouble(String.valueOf(value));
} catch (NumberFormatException ex) {
return defaultValue;
}
}
public static String formatDuration(long duration) {
long seconds = duration;
long hours = Double.valueOf(Math.floor(seconds / 3600.0)).longValue();
seconds = duration - hours * 3600;
long minutes = Double.valueOf(Math.floor(seconds / 60.0)).longValue();
seconds = seconds % 60;
if (hours > 0) {
return String.format("%d:%02d:%02d", hours, minutes, seconds);
}
return String.format("%d:%02d", minutes, seconds);
}
public static String[] formatBytesParts(long bytes, boolean showTB) {
DecimalFormat formatter = new DecimalFormat(FILE_SIZE_FORMAT_PATTERN);
if (bytes < 1048576) {
// less than 1MB
return new String[] { formatter.format(bytes / 1024.0), "KB" };
}
if (bytes < 1073741824) {
// less than 1GB
return new String[] { formatter.format(bytes / (1024.0 * 1024.0)), "MB" };
}
if (showTB) {
if (bytes < (1073741824L * 1024L)) {
return new String[] { formatter.format(bytes / (1024.0 * 1024.0 * 1024.0)), "GB" };
}
return new String[] { formatter.format(bytes / (1024.0 * 1024.0 * 1024.0 * 1024.0)), "TB" };
}
return new String[] { formatter.format(bytes / (1024.0 * 1024.0 * 1024.0)), "GB" };
}
public static String formatBytes(long bytes, boolean showTB) {
DecimalFormat formatter = new DecimalFormat(FILE_SIZE_FORMAT_PATTERN);
if (bytes < 1048576) {
// less than 1MB
return String.format("%sKB", formatter.format(bytes / 1024.0));
}
if (bytes < 1073741824) {
// less than 1GB
return String.format("%sMB", formatter.format(bytes / (1024.0 * 1024.0)));
}
if (showTB) {
if (bytes < (1073741824L * 1024L)) {
return String.format("%sGB", formatter.format(bytes / (1024.0 * 1024.0 * 1024.0)));
}
return String.format("%sTB", formatter.format(bytes / (1024.0 * 1024.0 * 1024.0 * 1024.0)));
}
return String.format("%sGB", formatter.format(bytes / (1024.0 * 1024.0 * 1024.0)));
}
public static JSONObject getJSONObject(String name, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getJSONObject(name) : null;
} catch (JSONException ex) {
return null;
}
}
public static boolean getJSONBoolean(String name, boolean defaultValue, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getBoolean(name) : defaultValue;
} catch (JSONException ex) {
return defaultValue;
}
}
public static String getJSONString(String name, String defaultValue, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getString(name) : defaultValue;
} catch (JSONException ex) {
return defaultValue;
}
}
public static double getJSONDouble(String name, double defaultValue, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getDouble(name) : defaultValue;
} catch (JSONException ex) {
return defaultValue;
}
}
public static long getJSONLong(String name, long defaultValue, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getLong(name) : defaultValue;
} catch (JSONException ex) {
return defaultValue;
}
}
public static int getJSONInt(String name, int defaultValue, JSONObject object) {
try {
return object.has(name) && !object.isNull(name) ? object.getInt(name) : defaultValue;
} catch (JSONException ex) {
return defaultValue;
}
}
public static void setViewEnabled(View view, boolean enabled) {
if (view != null) {
view.setEnabled(enabled);
}
}
public static String shortCurrencyFormat(double value) {
DecimalFormat format = new DecimalFormat("#,###.#");
if (value > 1000000000.00) {
return String.format("%sB", format.format(value / 1000000000.0));
}
if (value > 1000000.0) {
return String.format("%sM",format.format( value / 1000000.0));
}
if (value > 1000.0) {
return String.format("%sK", format.format(value / 1000.0));
}
if (value == 0) {
return "0";
}
return format.format(value).equals("0") ? FULL_LBC_CURRENCY_FORMAT.format(value) : format.format(value);
}
public static String getValue(CharSequence cs) {
return cs != null ? cs.toString().trim() : "";
}
public static List<String> buildContentSortOrder(int sortBy) {
List<String> sortOrder = new ArrayList<>();
switch (sortBy) {
case ContentSortDialogFragment.ITEM_SORT_BY_NEW:
sortOrder = Arrays.asList(Claim.ORDER_BY_RELEASE_TIME); break;
case ContentSortDialogFragment.ITEM_SORT_BY_TOP:
sortOrder = Arrays.asList(Claim.ORDER_BY_EFFECTIVE_AMOUNT); break;
case ContentSortDialogFragment.ITEM_SORT_BY_TRENDING:
sortOrder = Arrays.asList(Claim.ORDER_BY_TRENDING_GROUP, Claim.ORDER_BY_TRENDING_MIXED); break;
}
return sortOrder;
}
public static String buildReleaseTime(int contentFrom) {
if (contentFrom == 0 || contentFrom == ContentFromDialogFragment.ITEM_FROM_ALL_TIME) {
return null;
}
Calendar cal = Calendar.getInstance();
switch (contentFrom) {
case ContentFromDialogFragment.ITEM_FROM_PAST_24_HOURS: cal.add(Calendar.HOUR_OF_DAY, -24) ; break;
case ContentFromDialogFragment.ITEM_FROM_PAST_WEEK: default: cal.add(Calendar.DAY_OF_YEAR, -7); break;
case ContentFromDialogFragment.ITEM_FROM_PAST_MONTH: cal.add(Calendar.MONTH, -1); break;
case ContentFromDialogFragment.ITEM_FROM_PAST_YEAR: cal.add(Calendar.YEAR, -1); break;
}
return String.format(">%d", Double.valueOf(cal.getTimeInMillis() / 1000.0).longValue());
}
public static final Map<String, Integer> randomColorMap = new HashMap<>();
public static int generateRandomColorForValue(String value) {
if (Helper.isNullOrEmpty(value)) {
return 0;
}
if (randomColorMap.containsKey(value)) {
return randomColorMap.get(value);
}
Random random = new Random(value.hashCode());
int color = Color.argb(255, random.nextInt(256), random.nextInt(256), random.nextInt(256));
randomColorMap.put(value, color);
return color;
}
public static void setIconViewBackgroundColor(View view, int color, boolean isPlaceholder, Context context) {
Drawable bg = view.getBackground();
if (bg instanceof ShapeDrawable) {
((ShapeDrawable) bg).getPaint().setColor(isPlaceholder ? ContextCompat.getColor(context, android.R.color.transparent) : color);
} else if (bg instanceof GradientDrawable) {
((GradientDrawable) bg).setColor(isPlaceholder ? ContextCompat.getColor(context, android.R.color.transparent) : color);
} else if (bg instanceof ColorDrawable) {
((ColorDrawable) bg).setColor(isPlaceholder ? ContextCompat.getColor(context, android.R.color.transparent) : color);
}
}
public static List<Tag> getTagObjectsForTags(List<String> tags) {
List<Tag> tagObjects = new ArrayList<>(tags.size());
for (String tag : tags) {
tagObjects.add(new Tag(tag));
}
return tagObjects;
}
public static List<String> getTagsForTagObjects(List<Tag> tagObjects) {
List<String> tags = new ArrayList<>(tagObjects.size());
for (Tag tagObject : tagObjects) {
tags.add(tagObject.getLowercaseName());
}
return tags;
}
public static List<Tag> mergeKnownTags(List<Tag> fetchedTags) {
List<Tag> allKnownTags = getTagObjectsForTags(Predefined.DEFAULT_KNOWN_TAGS);
List<Integer> followIndexes = new ArrayList<>();
for (Tag tag : fetchedTags) {
if (!allKnownTags.contains(tag)) {
allKnownTags.add(tag);
} else if (tag.isFollowed()) {
followIndexes.add(allKnownTags.indexOf(tag));
}
}
for (int index : followIndexes) {
allKnownTags.get(index).setFollowed(true);
}
return allKnownTags;
}
public static List<Tag> filterFollowedTags(List<Tag> tags) {
List<Tag> followedTags = new ArrayList<>();
for (Tag tag : tags) {
if (tag.isFollowed()) {
followedTags.add(tag);
}
}
return followedTags;
}
public static List<Claim> filterDeletedClaims(List<Claim> claims) {
List<Claim> filtered = new ArrayList<>();
for (Claim claim : claims) {
if (!Lbry.abandonedClaimIds.contains(claim.getClaimId())) {
filtered.add(claim);
}
}
return filtered;
}
public static void setWunderbarValue(String value, Context context) {
if (context instanceof MainActivity) {
((MainActivity) context).setWunderbarValue(value);
}
}
public static String getDeviceName() {
if (Helper.isNullOrEmpty(Build.MANUFACTURER) || UNKNOWN.equalsIgnoreCase(Build.MANUFACTURER)) {
return Build.MODEL;
}
return String.format("%s %s", Build.MANUFACTURER, Build.MODEL);
}
public static boolean channelExists(String channelName) {
for (Claim claim : Lbry.ownChannels) {
if (channelName.equalsIgnoreCase(claim.getName())) {
return true;
}
}
return false;
}
public static boolean claimNameExists(String claimName) {
for (Claim claim : Lbry.ownClaims) {
if (claimName.equalsIgnoreCase(claim.getName())) {
return true;
}
}
return false;
}
public static String getRealPathFromURI_API19(final Context context, final Uri uri) {
return getRealPathFromURI_API19(context, uri, false);
}
/**
* https://gist.github.com/HBiSoft/15899990b8cd0723c3a894c1636550a8
*/
@SuppressLint("NewApi")
public static String getRealPathFromURI_API19(final Context context, final Uri uri, boolean folderPath) {
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];
// This is for checking Main Memory
if ("primary".equalsIgnoreCase(type)) {
if (split.length > 1) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
} else {
return Environment.getExternalStorageDirectory() + "/";
}
// This is for checking SD Card
} else {
return "storage" + "/" + docId.replace(":", "/");
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
String fileName = getFilePath(context, uri);
if (fileName != null) {
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
return folderPath ?
String.format("%s/Download", extStorageDirectory) :
String.format("%s/Download/%s", extStorageDirectory, fileName);
}
String id = DocumentsContract.getDocumentId(uri);
if (id.startsWith("raw:")) {
id = id.replaceFirst("raw:", "");
File file = new File(id);
if (file.exists())
return id;
}
String[] contentUriPrefixesToTry = new String[]{
"content://downloads/public_downloads",
"content://downloads/my_downloads",
"content://downloads/all_downloads"
};
for (String contentUriPrefix : contentUriPrefixesToTry) {
Uri contentUri = Helper.parseInt(id, -1) > 0 ?
ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id)) :
Uri.parse(contentUriPrefix);
try {
String path = getDataColumn(context, contentUri, null, null);
if (path != null) {
return path;
}
} catch (Exception ex) {
// pass
}
}
}
// 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]
};
try {
return getDataColumn(context, contentUri, selection, selectionArgs);
} catch (Exception ex) {
return null;
}
}
}
// 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 getFilePath(Context context, Uri uri) {
Cursor cursor = null;
final String[] projection = { MediaStore.MediaColumns.DISPLAY_NAME };
try {
cursor = context.getContentResolver().query(uri, projection, null, null, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
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;
}
/**
* @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());
}
/**
* @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());
}
/**
* @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());
}
/**
* @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());
}
public static void applyHtmlForTextView(TextView textView) {
textView.setMovementMethod(LinkMovementMethod.getInstance());
textView.setText(HtmlCompat.fromHtml(textView.getText().toString(), HtmlCompat.FROM_HTML_MODE_LEGACY));
}
public static List<Claim> filterInvalidReposts(List<Claim> claims) {
List<Claim> filtered = new ArrayList<>();
for (Claim claim : claims) {
if (Claim.TYPE_REPOST.equalsIgnoreCase(claim.getValueType()) && claim.getRepostedClaim() == null) {
continue;
}
filtered.add(claim);
}
return filtered;
}
public static List<LbryFile> filterDownloads(List<LbryFile> files) {
List<LbryFile> filtered = new ArrayList<>();
for (int i = 0; i < files.size(); i++) {
LbryFile file = files.get(i);
// remove own claims as well
if (Lbry.ownClaims != null && Lbry.ownClaims.size() > 0) {
for (Claim own : Lbry.ownClaims) {
if (own.getClaimId().equalsIgnoreCase(file.getClaimId())) {
continue;
}
}
}
if (!Helper.isNullOrEmpty(file.getDownloadPath())) {
filtered.add(file);
}
}
return filtered;
}
public static List<Claim> claimsFromFiles(List<LbryFile> files) {
List<Claim> claims = new ArrayList<>();
for (LbryFile file : files) {
claims.add(file.getClaim());
}
return claims;
}
public static List<Claim> claimsFromViewHistory(List<ViewHistory> history) {
List<Claim> claims = new ArrayList<>();
for (ViewHistory item : history) {
claims.add(Claim.fromViewHistory(item));
}
return claims;
}
public static void saveUrlHistory(String url, String title, int type) {
DatabaseHelper dbHelper = DatabaseHelper.getInstance();
if (dbHelper != null) {
UrlSuggestion suggestion = new UrlSuggestion();
suggestion.setUri(LbryUri.tryParse(url));
suggestion.setType(type);
suggestion.setText(Helper.isNull(title) ? "" : title);
new SaveUrlHistoryTask(suggestion, dbHelper, null).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
}
public static void saveViewHistory(String url, Claim claim) {
DatabaseHelper dbHelper = DatabaseHelper.getInstance();
if (dbHelper != null) {
ViewHistory viewHistory = ViewHistory.fromClaimWithUrlAndDeviceName(claim, url, getDeviceName());
new SaveViewHistoryTask(viewHistory, dbHelper, null).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
}
public static String normalizeChannelName(String channelName) {
if (Helper.isNullOrEmpty(channelName)) {
return "";
}
if (!channelName.startsWith("@")) {
return String.format("@%s", channelName);
}
return channelName;
}
public static int getScaledValue(int value, float scale) {
return (int) (value * scale + 0.5f);
}
public static String generateUrl() {
Random random = new Random();
StringBuilder sb = new StringBuilder();
sb.append(Predefined.ADJECTIVES.get(random.nextInt(Predefined.ADJECTIVES.size()))).append("-").
append(Predefined.ADJECTIVES.get(random.nextInt(Predefined.ADJECTIVES.size()))).append("-").
append(Predefined.ANIMALS.get(random.nextInt(Predefined.ANIMALS.size())));
return sb.toString().toLowerCase();
}
public static void refreshRecyclerView(RecyclerView rv) {
if (rv == null) {
return;
}
RecyclerView.Adapter adapter = rv.getAdapter();
int prevScrollPosition = 0;
RecyclerView.LayoutManager lm = rv.getLayoutManager();
if (lm instanceof LinearLayoutManager) {
prevScrollPosition = ((LinearLayoutManager) lm).findLastCompletelyVisibleItemPosition();
} else if (lm instanceof GridLayoutManager) {
prevScrollPosition = ((GridLayoutManager) lm).findLastCompletelyVisibleItemPosition();
}
rv.setAdapter(null);
rv.setAdapter(adapter);
rv.scrollToPosition(prevScrollPosition > 0 ? prevScrollPosition : 0);
}
public static String makeid(int length) {
Random random = new Random();
String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
StringBuilder id = new StringBuilder();
for (int i = 0; i < length; i++) {
id.append(chars.charAt(random.nextInt(chars.length())));
}
return id.toString();
}
public static String SHA256(String value) {
try {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(value.getBytes("UTF-8"));
return Hex.bytesToStringLowercase(hash);
} catch (NoSuchAlgorithmException | UnsupportedEncodingException ex) {
return null;
}
}
}