hope you doing great.i'm very new to android programming and i have source of an app which i intend to modify and add PatternLockView library to it . i watched a youtube video tutorial but i can't use handler.postdelay option in the code (android studio returns with : Cannot resolve symbol 'postdelayed').the coder who made the tutorial didn't got any errors or so but android studio gives me lots of them . any help or hint is appreciated. here is the code :
Handler handler = new Handler ();
handler.postdelayed {
@Override
public void run() {
SharedPreferences preferences = getSharedPreferences("PREFS", 0);
String password = preferences.getString("password","0");
if (password.equals("0")) {
Intent intent = new Intent (getApplicationContext(),CreatePasswordActivity.class);
startActivity(intent);
finish();
} else {
Intent intent = new Intent (getApplicationContext(),InputPasswordActivity.class);
startActivity(intent);
finish();
}
}
}2000
/*#######################################################
*
* Maintained by Gregor Santner, 2017-
* https://gsantner.net/
*
* License of this file: Apache 2.0 (Commercial upon request)
* https://www.apache.org/licenses/LICENSE-2.0
*
#########################################################*/
package net.gsantner.markor.activity;
import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import com.pixplicity.generate.Rate;
import net.gsantner.markor.BuildConfig;
import net.gsantner.markor.R;
import net.gsantner.markor.format.TextFormat;
import net.gsantner.markor.ui.FilesystemViewerCreator;
import net.gsantner.markor.ui.NewFileDialog;
import net.gsantner.markor.util.ActivityUtils;
import net.gsantner.markor.util.AppSettings;
import net.gsantner.markor.util.PermissionChecker;
import net.gsantner.markor.util.ShareUtil;
import net.gsantner.opoc.activity.GsFragmentBase;
import net.gsantner.opoc.format.markdown.SimpleMarkdownParser;
import net.gsantner.opoc.ui.FilesystemViewerAdapter;
import net.gsantner.opoc.ui.FilesystemViewerData;
import net.gsantner.opoc.ui.FilesystemViewerFragment;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.concurrent.TimeUnit;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.OnLongClick;
import butterknife.OnPageChange;
public class MainActivity extends AppActivityBase implements FilesystemViewerFragment.FilesystemFragmentOptionsListener, BottomNavigationView.OnNavigationItemSelectedListener {
//START
Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed( () -> {
SharedPreferences preferences = getSharedPreferences("PREFS", 0);
String password = preferences.getString("password","0");
if (password.equals("0")) {
Intent intent = new Intent (getApplicationContext(),CreatePasswordActivity.class);
startActivity(intent);
finish();
} else {
Intent intent = new Intent (getApplicationContext(),InputPasswordActivity.class);
startActivity(intent);
finish();
}
}, 2000);
// END
public static boolean IS_DEBUG_ENABLED = false;
@BindView(R.id.toolbar)
public Toolbar _toolbar;
@BindView(R.id.bottom_navigation_bar)
BottomNavigationView _bottomNav;
@BindView(R.id.fab_add_new_item)
FloatingActionButton _fab;
@BindView(R.id.main__view_pager_container)
ViewPager _viewPager;
private SectionsPagerAdapter _viewPagerAdapter;
private boolean _doubleBackToExitPressedOnce;
private MenuItem _lastBottomMenuItem;
private AppSettings _appSettings;
private ActivityUtils _contextUtils;
private ShareUtil _shareUtil;
@SuppressLint("SdCardPath")
@Override
protected void onCreate(Bundle savedInstanceState) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setExitTransition(null);
}
_appSettings = new AppSettings(this);
_contextUtils = new ActivityUtils(this);
_shareUtil = new ShareUtil(this);
_contextUtils.setAppLanguage(_appSettings.getLanguage());
if (_appSettings.isOverviewStatusBarHidden()) {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
setTheme(_appSettings.isDarkThemeEnabled() ? R.style.AppTheme_Dark : R.style.AppTheme_Light);
super.onCreate(savedInstanceState);
setContentView(R.layout.main__activity);
ButterKnife.bind(this);
setSupportActionBar(_toolbar);
_toolbar.setOnClickListener(this::onToolbarTitleClicked);
optShowRate();
try {
if (_appSettings.isAppCurrentVersionFirstStart(true)) {
SimpleMarkdownParser smp = SimpleMarkdownParser.get().setDefaultSmpFilter(SimpleMarkdownParser.FILTER_ANDROID_TEXTVIEW);
String html = "";
html = smp.parse(getString(R.string.copyright_license_text_official).replace("\n", " \n"), "").getHtml();
html = "<br/><br/><br/><big><big>" getString(R.string.changelog) "</big></big><br/>" smp.parse(getResources().openRawResource(R.raw.changelog), "", SimpleMarkdownParser.FILTER_ANDROID_TEXTVIEW);
html = "<br/><br/><br/><big><big>" getString(R.string.licenses) "</big></big><br/>" smp.parse(getResources().openRawResource(R.raw.licenses_3rd_party), "").getHtml();
ActivityUtils _au = new ActivityUtils(this);
_au.showDialogWithHtmlTextView(0, html);
}
} catch (IOException e) {
e.printStackTrace();
}
IntroActivity.optStart(this);
// Setup viewpager
_viewPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
_viewPager.setAdapter(_viewPagerAdapter);
_viewPager.setOffscreenPageLimit(4);
_bottomNav.setOnNavigationItemSelectedListener(this);
// noinspection PointlessBooleanExpression - Send Test intent
if (BuildConfig.IS_TEST_BUILD && false) {
DocumentActivity.launch(this, new File("/sdcard/Documents/mordor/aa-beamer.md"), false, true, null, null);
}
(new ActivityUtils(this)).applySpecialLaunchersVisibility(_appSettings.isSpecialFileLaunchersEnabled());
_bottomNav.postDelayed(() -> {
if (_appSettings.getAppStartupTab() != R.id.nav_notebook) {
_bottomNav.setSelectedItemId(_appSettings.getAppStartupTab());
}
}, 1);
}
private void optShowRate() {
new Rate.Builder(this)
.setTriggerCount(4)
.setMinimumInstallTime((int) TimeUnit.MINUTES.toMillis(30))
.setFeedbackAction(() -> new ActivityUtils(this).showGooglePlayEntryForThisApp())
.build().count().showRequest();
}
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
PermissionChecker permc = new PermissionChecker(this);
permc.checkPermissionResult(requestCode, permissions, grantResults);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
AppSettings as = new AppSettings(this);
switch (item.getItemId()) {
case R.id.action_preview: {
File f = _bottomNav.getSelectedItemId() == R.id.nav_quicknote ? as.getQuickNoteFile() : as.getTodoFile();
DocumentActivity.launch(MainActivity.this, f, false, true, null, null);
return true;
}
case R.id.action_settings: {
new ActivityUtils(this).animateToActivity(SettingsActivity.class, false, null);
return true;
}
}
return false;
}
@Override
public boolean onCreateOptionsMenu(final Menu menu) {
getMenuInflater().inflate(R.menu.main__menu, menu);
menu.findItem(R.id.action_settings).setVisible(_appSettings.isShowSettingsOptionInMainToolbar());
_contextUtils.tintMenuItems(menu, true, Color.WHITE);
_contextUtils.setSubMenuIconsVisiblity(menu, true);
return true;
}
@Override
protected void onResume() {
//new AndroidSupportMeWrapper(this).mainOnResume();
super.onResume();
IS_DEBUG_ENABLED = BuildConfig.IS_TEST_BUILD;
if (_appSettings.isRecreateMainRequired()) {
// recreate(); // does not remake fragments
Intent intent = getIntent();
overridePendingTransition(0, 0);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
finish();
overridePendingTransition(0, 0);
startActivity(intent);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && _appSettings.isMultiWindowEnabled()) {
setTaskDescription(new ActivityManager.TaskDescription(getString(R.string.app_name)));
}
int color = ContextCompat.getColor(this, _appSettings.isDarkThemeEnabled()
? R.color.dark__background : R.color.light__background);
_viewPager.getRootView().setBackgroundColor(color);
if (_appSettings.isKeepScreenOn()) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
} else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
}
@Override
@SuppressWarnings("unused")
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Determine some results and forward using Local Broadcast
Object result = _shareUtil.extractResultFromActivityResult(requestCode, resultCode, data, this);
try {
FilesystemViewerFragment frag = (FilesystemViewerFragment) _viewPagerAdapter.getFragmentByTag(FilesystemViewerFragment.FRAGMENT_TAG);
frag.getAdapter().reconfigure();
} catch (Exception ignored) {
recreate();
}
}
@OnLongClick({R.id.fab_add_new_item})
public boolean onLongClickFab(View view) {
PermissionChecker permc = new PermissionChecker(this);
FilesystemViewerFragment fsFrag = (FilesystemViewerFragment) _viewPagerAdapter.getFragmentByTag(FilesystemViewerFragment.FRAGMENT_TAG);
if (fsFrag != null && permc.mkdirIfStoragePermissionGranted()) {
fsFrag.getAdapter().setCurrentFolder(fsFrag.getCurrentFolder().equals(FilesystemViewerAdapter.VIRTUAL_STORAGE_RECENTS)
? FilesystemViewerAdapter.VIRTUAL_STORAGE_FAVOURITE : FilesystemViewerAdapter.VIRTUAL_STORAGE_RECENTS
, true);
}
return true;
}
@SuppressWarnings("SwitchStatementWithTooFewBranches")
@OnClick({R.id.fab_add_new_item})
public void onClickFab(View view) {
PermissionChecker permc = new PermissionChecker(this);
FilesystemViewerFragment fsFrag = (FilesystemViewerFragment) _viewPagerAdapter.getFragmentByTag(FilesystemViewerFragment.FRAGMENT_TAG);
if (fsFrag == null) {
return;
}
if (fsFrag.getAdapter().isCurrentFolderVirtual()) {
fsFrag.getAdapter().loadFolder(_appSettings.getNotebookDirectory());
return;
}
if (permc.mkdirIfStoragePermissionGranted()) {
switch (view.getId()) {
case R.id.fab_add_new_item: {
if (_shareUtil.isUnderStorageAccessFolder(fsFrag.getCurrentFolder()) && _shareUtil.getStorageAccessFrameworkTreeUri() == null) {
_shareUtil.showMountSdDialog(this);
return;
}
if (!fsFrag.getAdapter().isCurrentFolderWriteable()) {
return;
}
NewFileDialog dialog = NewFileDialog.newInstance(fsFrag.getCurrentFolder(), true, (ok, f) -> {
if (ok) {
if (f.isFile()) {
DocumentActivity.launch(MainActivity.this, f, false, false, null, null);
} else if (f.isDirectory()) {
FilesystemViewerFragment wrFragment = (FilesystemViewerFragment) _viewPagerAdapter.getFragmentByTag(FilesystemViewerFragment.FRAGMENT_TAG);
if (wrFragment != null) {
wrFragment.reloadCurrentFolder();
}
}
}
});
dialog.show(getSupportFragmentManager(), NewFileDialog.FRAGMENT_TAG);
break;
}
}
}
}
@Override
public void onBackPressed() {
// Exit confirmed with 2xBack
if (_doubleBackToExitPressedOnce) {
super.onBackPressed();
_appSettings.setFileBrowserLastBrowsedFolder(_appSettings.getNotebookDirectory());
return;
}
// Check if fragment handled back press
GsFragmentBase frag = _viewPagerAdapter.getCachedFragments().get(_viewPager.getCurrentItem());
if (frag != null && frag.onBackPressed()) {
return;
}
// Confirm exit with back / snackbar
_doubleBackToExitPressedOnce = true;
new ActivityUtils(this).showSnackBar(R.string.press_back_again_to_exit, false, R.string.exit, view -> finish());
new Handler().postDelayed(() -> _doubleBackToExitPressedOnce = false, 2000);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
updateFabVisibility(item.getItemId() == R.id.nav_notebook);
PermissionChecker permc = new PermissionChecker(this);
switch (item.getItemId()) {
case R.id.nav_notebook: {
_viewPager.setCurrentItem(0);
_toolbar.setTitle(getFileBrowserTitle());
return true;
}
case R.id.nav_todo: {
permc.doIfExtStoragePermissionGranted(); // cannot prevent bottom tab selection
restoreDefaultToolbar();
_viewPager.setCurrentItem(1);
_toolbar.setTitle(R.string.todo);
return true;
}
case R.id.nav_quicknote: {
permc.doIfExtStoragePermissionGranted(); // cannot prevent bottom tab selection
restoreDefaultToolbar();
_viewPager.setCurrentItem(2);
_toolbar.setTitle(R.string.quicknote);
return true;
}
case R.id.nav_more: {
restoreDefaultToolbar();
_viewPager.setCurrentItem(3);
_toolbar.setTitle(R.string.more);
return true;
}
}
return false;
}
public void updateFabVisibility(boolean visible) {
if (visible) {
_fab.show();
} else {
_fab.hide();
}
}
public String getFileBrowserTitle() {
final File file = _appSettings.getFileBrowserLastBrowsedFolder();
String title = getString(R.string.app_name);
if (!_appSettings.getNotebookDirectory().getAbsolutePath().equals(file.getAbsolutePath())) {
title = "> " file.getName();
}
return title;
}
@OnPageChange(value = R.id.main__view_pager_container, callback = OnPageChange.Callback.PAGE_SELECTED)
public void onViewPagerPageSelected(int pos) {
Menu menu = _bottomNav.getMenu();
PermissionChecker permc = new PermissionChecker(this);
(_lastBottomMenuItem != null ? _lastBottomMenuItem : menu.getItem(0)).setChecked(false);
_lastBottomMenuItem = menu.getItem(pos).setChecked(true);
updateFabVisibility(pos == 0);
_toolbar.setTitle(new String[]{getFileBrowserTitle(), getString(R.string.todo), getString(R.string.quicknote), getString(R.string.more)}[pos]);
if (pos > 0 && pos < 3) {
permc.doIfExtStoragePermissionGranted(); // cannot prevent bottom tab selection
}
}
private FilesystemViewerData.Options _filesystemDialogOptions = null;
@Override
public FilesystemViewerData.Options getFilesystemFragmentOptions(FilesystemViewerData.Options existingOptions) {
if (_filesystemDialogOptions == null) {
_filesystemDialogOptions = FilesystemViewerCreator.prepareFsViewerOpts(getApplicationContext(), false, new FilesystemViewerData.SelectionListenerAdapter() {
@Override
public void onFsViewerConfig(FilesystemViewerData.Options dopt) {
dopt.descModtimeInsteadOfParent = true;
//opt.rootFolder = _appSettings.getNotebookDirectory();
dopt.rootFolder = _appSettings.getFolderToLoadByMenuId(_appSettings.getAppStartupFolderMenuId());
dopt.folderFirst = _appSettings.isFilesystemListFolderFirst();
dopt.doSelectMultiple = dopt.doSelectFolder = dopt.doSelectFile = true;
dopt.mountedStorageFolder = _shareUtil.getStorageAccessFolder();
dopt.showDotFiles = _appSettings.isShowDotFiles();
dopt.fileComparable = FilesystemViewerFragment.sortFolder(null);
}
@Override
public void onFsViewerDoUiUpdate(FilesystemViewerAdapter adapter) {
if (adapter != null && adapter.getCurrentFolder() != null && !TextUtils.isEmpty(adapter.getCurrentFolder().getName())) {
_appSettings.setFileBrowserLastBrowsedFolder(adapter.getCurrentFolder());
_toolbar.setTitle(adapter.areItemsSelected() ? "" : getFileBrowserTitle());
invalidateOptionsMenu();
if (adapter.getCurrentFolder().equals(FilesystemViewerAdapter.VIRTUAL_STORAGE_FAVOURITE)) {
adapter.getFsOptions().favouriteFiles = _appSettings.getFavouriteFiles();
}
}
}
@Override
public void onFsViewerSelected(String request, File file, final Integer lineNumber) {
if (TextFormat.isTextFile(file)) {
DocumentActivity.launch(MainActivity.this, file, false, null, null, lineNumber);
} else if (file.getName().toLowerCase().endsWith(".apk")) {
_shareUtil.requestApkInstallation(file);
} else {
DocumentActivity.askUserIfWantsToOpenFileInThisApp(MainActivity.this, file);
}
}
});
}
return _filesystemDialogOptions;
}
class SectionsPagerAdapter extends FragmentPagerAdapter {
private HashMap<Integer, GsFragmentBase> _fragCache = new LinkedHashMap<>();
SectionsPagerAdapter(FragmentManager fragMgr) {
super(fragMgr);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
GsFragmentBase fragment = (GsFragmentBase) super.instantiateItem(container, position);
_fragCache.put(position, fragment);
return fragment;
}
@Override
public Fragment getItem(int pos) {
final Fragment existing = _fragCache.get(pos);
if (existing != null) {
return existing;
}
switch (_bottomNav.getMenu().getItem(pos).getItemId()) {
default:
case R.id.nav_notebook: {
return FilesystemViewerFragment.newInstance(getFilesystemFragmentOptions(null));
}
case R.id.nav_quicknote: {
return DocumentEditFragment.newInstance(_appSettings.getQuickNoteFile(), false, -1);
}
case R.id.nav_todo: {
return DocumentEditFragment.newInstance(_appSettings.getTodoFile(), false, -1);
}
case R.id.nav_more: {
return MoreFragment.newInstance();
}
}
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
_fragCache.remove(position);
}
@Override
public int getCount() {
return _bottomNav.getMenu().size();
}
public GsFragmentBase getFragmentByTag(String fragmentTag) {
for (GsFragmentBase frag : _fragCache.values()) {
if (fragmentTag.equals(frag.getFragmentTag())) {
return frag;
}
}
return null;
}
public HashMap<Integer, GsFragmentBase> getCachedFragments() {
return _fragCache;
}
}
@Override
protected void onStop() {
super.onStop();
restoreDefaultToolbar();
}
/**
* Restores the default toolbar. Used when changing the tab or moving to another activity
* while {@link FilesystemViewerFragment} action mode is active (e.g. when renaming a file)
*/
private void restoreDefaultToolbar() {
FilesystemViewerFragment wrFragment = (FilesystemViewerFragment) _viewPagerAdapter.getFragmentByTag(FilesystemViewerFragment.FRAGMENT_TAG);
if (wrFragment != null) {
wrFragment.clearSelection();
}
}
private void onToolbarTitleClicked(View v) {
Fragment f = _viewPagerAdapter.getItem(_viewPager.getCurrentItem());
if (f instanceof DocumentEditFragment) {
DocumentEditFragment def = (DocumentEditFragment) f;
def.onToolbarTitleClicked(_toolbar);
}
}
}
CodePudding user response：
Since the postDelayed is a method, you have to use () along with it. It takes 2 parameters, first one is a Runnable object and second one is a millisecond value to delay which is an int type. Also Handler() constructor is depracated, that's why you have to bind your handler to a looper object, commonly to the main looper. Here is the fixed code:
// Make sure you import the right Handler class
import android.os.Handler;
Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed( () -> {
SharedPreferences preferences = getSharedPreferences("PREFS", 0);
String password = preferences.getString("password","0");
if (password.equals("0")) {
Intent intent = new Intent (getApplicationContext(),CreatePasswordActivity.class);
startActivity(intent);
finish();
} else {
Intent intent = new Intent (getApplicationContext(),InputPasswordActivity.class);
startActivity(intent);
finish();
}
}, millisecondDelay);
UPDATE
I've noted that your postdelayed syntax isn't correct. It must be as postDelayed. I updated my answer chek the code out again.