Java tutorial
/* * Copyright (C) 2012,2013 Renard Wellnitz. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.example.linhdq.test.documents.viewing.grid; import android.Manifest; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.ContentValues; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.support.design.widget.NavigationView; import android.support.v4.app.FragmentManager; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.view.ActionMode; import android.support.v7.widget.Toolbar; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.GridView; import android.widget.Toast; import com.example.linhdq.test.HintDialog; import com.example.linhdq.test.PermissionGrantedEvent; import com.example.linhdq.test.R; import com.example.linhdq.test.documents.creation.ImageSource; import com.example.linhdq.test.documents.creation.NewDocumentActivity; import com.example.linhdq.test.documents.creation.PixLoadStatus; import com.example.linhdq.test.documents.viewing.DocumentContentProvider; import com.example.linhdq.test.documents.viewing.single.DocumentActivity; import com.example.linhdq.test.install.InstallActivity; import com.example.linhdq.test.main_menu.AboutActivity; import com.example.linhdq.test.main_menu.FeedbackActivity; import com.example.linhdq.test.main_menu.ReleaseNoteDialog; import com.example.linhdq.test.main_menu.language.OCRLanguageActivity; import com.example.linhdq.test.main_menu.language.OcrLanguage; import com.example.linhdq.test.main_menu.language.OcrLanguageDataStore; import com.example.linhdq.test.util.PreferencesUtils; import com.example.linhdq.test.util.Util; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Set; import de.greenrobot.event.EventBus; /** * main activity of the app * * @author renard */ public class DocumentGridActivity extends NewDocumentActivity implements DocumentGridAdapter.OnCheckedChangeListener, LoaderManager.LoaderCallbacks<Cursor> { private static final String LOG_TAG = DocumentGridActivity.class.getSimpleName(); private DocumentGridAdapter mDocumentAdapter; private GridView mGridView; private static final int MESSAGE_UPDATE_THUMNAILS = 1; private static final int DELAY_SHOW_THUMBNAILS = 550; private static final String SAVE_STATE_KEY = "selection"; private static final int JOIN_PROGRESS_DIALOG = 4; private ActionMode mActionMode; private static final int REQUEST_CODE_INSTALL = 234; private static boolean sIsInSelectionMode = false; private boolean mFingerUp = true; private int mScrollState = AbsListView.OnScrollListener.SCROLL_STATE_IDLE; private final Handler mScrollHandler = new ScrollHandler(); private boolean mPendingThumbnailUpdate = false; private boolean mBusIsRegistered = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_document_grid); initToolbar(); initNavigationDrawer(); initGridView(); setupAddLanguageButton(); if (savedInstanceState == null) { checkForImageIntent(getIntent()); } } @Override protected void onResume() { // ViewServer.get(this).setFocusedWindow(this); super.onResume(); if (!mBusIsRegistered) { EventBus.getDefault().register(this); mBusIsRegistered = true; } ensurePermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, R.string.permission_explanation); } @SuppressWarnings("unused") public void onEventMainThread(final PermissionGrantedEvent event) { Log.i(LOG_TAG, "Permission Granted"); startInstallActivityIfNeeded(); initThumbnailSize(); } @Override protected int getHintDialogId() { return HINT_DIALOG_ID; } private void initThumbnailSize() { final int columnWidth = Util.determineThumbnailSize(this, null); Util.setThumbnailSize(columnWidth, columnWidth, this); } private void setupAddLanguageButton() { final View viewById = findViewById(R.id.install_language_button); viewById.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(DocumentGridActivity.this, OCRLanguageActivity.class); startActivity(i); } }); } @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); setIntent(intent); checkForImageIntent(intent); } private void checkForImageIntent(Intent intent) { String action = intent.getAction(); String type = intent.getType(); if (Intent.ACTION_SEND.equals(action) && type != null) { Uri imageUri = intent.getParcelableExtra(Intent.EXTRA_STREAM); if (imageUri != null) { loadBitmapFromContentUri(imageUri, ImageSource.INTENT); } else { showFileError(PixLoadStatus.IMAGE_COULD_NOT_BE_READ, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }); } } } /** * Start the InstallActivity if possible and needed. */ private void startInstallActivityIfNeeded() { final List<OcrLanguage> installedOCRLanguages = OcrLanguageDataStore.getInstalledOCRLanguages(this); final String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { if (installedOCRLanguages.isEmpty()) { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setClassName(this, InstallActivity.class.getName()); startActivityForResult(intent, REQUEST_CODE_INSTALL); } } else { AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setMessage(getString(R.string.no_sd_card)); alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }); alert.show(); } } private void initNavigationDrawer() { final DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); NavigationView view = (NavigationView) findViewById(R.id.left_drawer); handleNavigationMenuSelection(drawerLayout, view); ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, (Toolbar) findViewById(R.id.toolbar), R.string.drawer_open, R.string.drawer_close) { public void onDrawerClosed(View view) { super.onDrawerClosed(view); // invalidateOptionsMenu(); syncState(); } public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); // invalidateOptionsMenu(); syncState(); } }; drawerLayout.setDrawerListener(actionBarDrawerToggle); // Enable ActionBar app icon to behave as action to toggle nav drawer getSupportActionBar().setHomeButtonEnabled(true); actionBarDrawerToggle.syncState(); if (checkForFirstStart()) { drawerLayout.openDrawer(GravityCompat.START); } } private boolean checkForFirstStart() { final boolean firstStart = PreferencesUtils.isFirstStart(getApplicationContext()); if (firstStart) { PreferencesUtils.setFirstStart(getApplicationContext(), false); } return firstStart; } private void handleNavigationMenuSelection(final DrawerLayout drawerLayout, NavigationView view) { view.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(MenuItem menuItem) { drawerLayout.closeDrawers(); switch (menuItem.getItemId()) { case R.id.whats_new: FragmentManager supportFragmentManager = getSupportFragmentManager(); new ReleaseNoteDialog().show(supportFragmentManager, ReleaseNoteDialog.TAG); break; case R.id.add_language: Intent i = new Intent(DocumentGridActivity.this, OCRLanguageActivity.class); startActivity(i); overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); break; case R.id.show_tips: overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); break; case R.id.feedback: startActivity(new Intent(DocumentGridActivity.this, FeedbackActivity.class)); overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); break; case R.id.about: startActivity(new Intent(DocumentGridActivity.this, AboutActivity.class)); overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); break; } return true; } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_INSTALL) { if (RESULT_OK == resultCode) { // install successfull, show happy fairy or introduction text } else { // install failed, quit immediately finish(); } } else { super.onActivityResult(requestCode, resultCode, data); } } @Override public boolean onOptionsItemSelected(MenuItem item) { final DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); switch (item.getItemId()) { case android.R.id.home: drawerLayout.openDrawer(GravityCompat.START); return true; } return super.onOptionsItemSelected(item); } public static boolean isInSelectionMode() { return sIsInSelectionMode; } @Override protected Dialog onCreateDialog(int id, Bundle args) { switch (id) { case HINT_DIALOG_ID: return HintDialog.createDialog(this, R.string.document_list_help_title, R.raw.document_list_help); } return super.onCreateDialog(id, args); } @Override public void onCheckedChanged(Set<Integer> checkedIds) { if (mActionMode == null && checkedIds.size() > 0) { mActionMode = startSupportActionMode(new DocumentActionCallback()); } else if (mActionMode != null && checkedIds.size() == 0) { mActionMode.finish(); mActionMode = null; } if (mActionMode != null) { // change state of action mode depending on the selection final MenuItem editItem = mActionMode.getMenu().findItem(R.id.item_edit_title); final MenuItem joinItem = mActionMode.getMenu().findItem(R.id.item_join); if (checkedIds.size() == 1) { editItem.setVisible(true); editItem.setEnabled(true); joinItem.setVisible(false); joinItem.setEnabled(false); } else { editItem.setVisible(false); editItem.setEnabled(false); joinItem.setVisible(true); joinItem.setEnabled(true); } } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); Set<Integer> selection = mDocumentAdapter.getSelectedDocumentIds(); ArrayList<Integer> save = new ArrayList<Integer>(selection.size()); save.addAll(selection); outState.putIntegerArrayList(SAVE_STATE_KEY, save); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); ArrayList<Integer> selection = savedInstanceState.getIntegerArrayList(SAVE_STATE_KEY); mDocumentAdapter.setSelectedDocumentIds(selection); } public class DocumentClickListener implements OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { DocumentGridAdapter.DocumentViewHolder holder = (DocumentGridAdapter.DocumentViewHolder) view.getTag(); if (sIsInSelectionMode) { holder.gridElement.toggle(); } else { Intent i = new Intent(DocumentGridActivity.this, DocumentActivity.class); long documentId = mDocumentAdapter.getItemId(position); Uri uri = Uri.withAppendedPath(DocumentContentProvider.CONTENT_URI, String.valueOf(documentId)); i.setData(uri); startActivity(i); } } } private class DocumentLongClickListener implements OnItemLongClickListener { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { CheckableGridElement clicked = (CheckableGridElement) view; if (!sIsInSelectionMode) { sIsInSelectionMode = true; clicked.toggle(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { CheckableGridElement element = (CheckableGridElement) parent.getChildAt(i); if (element != view) { element.setChecked(false); } } } else { clicked.toggle(); } return true; } } int getScrollState() { return mScrollState; } private class DocumentScrollListener implements AbsListView.OnScrollListener { public void onScrollStateChanged(AbsListView view, int scrollState) { if (mScrollState == SCROLL_STATE_FLING && scrollState != SCROLL_STATE_FLING) { final Handler handler = mScrollHandler; final Message message = handler.obtainMessage(MESSAGE_UPDATE_THUMNAILS, DocumentGridActivity.this); handler.removeMessages(MESSAGE_UPDATE_THUMNAILS); handler.sendMessageDelayed(message, mFingerUp ? 0 : DELAY_SHOW_THUMBNAILS); mPendingThumbnailUpdate = true; } else if (scrollState == SCROLL_STATE_FLING) { mPendingThumbnailUpdate = false; mScrollHandler.removeMessages(MESSAGE_UPDATE_THUMNAILS); } mScrollState = scrollState; } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } } private static class ScrollHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_UPDATE_THUMNAILS: ((DocumentGridActivity) msg.obj).updateDocumentThumbnails(); break; } } } private class FingerTracker implements View.OnTouchListener { public boolean onTouch(View view, MotionEvent event) { final int action = event.getAction(); mFingerUp = action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL; if (mFingerUp && mScrollState != DocumentScrollListener.SCROLL_STATE_FLING) { postDocumentThumbnails(); } return false; } } @Override public void onBackPressed() { if (mDocumentAdapter.getSelectedDocumentIds().size() > 0) { cancelMultiSelectionMode(); } else { super.onBackPressed(); } } public boolean isPendingThumbnailUpdate() { return mPendingThumbnailUpdate; } private void updateDocumentThumbnails() { mPendingThumbnailUpdate = false; final GridView grid = mGridView; final int count = grid.getChildCount(); for (int i = 0; i < count; i++) { final View view = grid.getChildAt(i); final DocumentGridAdapter.DocumentViewHolder holder = (DocumentGridAdapter.DocumentViewHolder) view .getTag(); if (holder.updateThumbnail) { final int documentId = holder.documentId; CrossFadeDrawable d = holder.transition; FastBitmapDrawable thumb = Util.getDocumentThumbnail(documentId); if (thumb.getBitmap() != null) { d.setEnd(thumb.getBitmap()); holder.gridElement.setImage(d); d.startTransition(375); } holder.updateThumbnail = false; } } grid.invalidate(); } private void postDocumentThumbnails() { Handler handler = mScrollHandler; Message message = handler.obtainMessage(MESSAGE_UPDATE_THUMNAILS, DocumentGridActivity.this); handler.removeMessages(MESSAGE_UPDATE_THUMNAILS); mPendingThumbnailUpdate = true; handler.sendMessage(message); } private class DocumentActionCallback implements ActionMode.Callback { @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { int itemId = item.getItemId(); if (itemId == R.id.item_join) { joinDocuments(mDocumentAdapter.getSelectedDocumentIds()); cancelMultiSelectionMode(); mode.finish(); return true; } else if (itemId == R.id.item_edit_title) { final Set<Integer> selectedDocs = mDocumentAdapter.getSelectedDocumentIds(); final int documentId = selectedDocs.iterator().next(); getSupportLoaderManager().initLoader(documentId, null, DocumentGridActivity.this); return true; } else if (itemId == R.id.item_export_as_pdf) { new CreatePDFTask(mDocumentAdapter.getSelectedDocumentIds()).execute(); cancelMultiSelectionMode(); mode.finish(); return true; } else if (itemId == R.id.item_delete) { new DeleteDocumentTask(mDocumentAdapter.getSelectedDocumentIds(), false).execute(); cancelMultiSelectionMode(); mode.finish(); return true; } return true; } @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { getMenuInflater().inflate(R.menu.grid_action_mode, menu); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public void onDestroyActionMode(ActionMode mode) { if (mActionMode != null) { mActionMode = null; cancelMultiSelectionMode(); } mActionMode = null; } } @Override protected void onPause() { super.onPause(); EventBus.getDefault().unregister(this); mBusIsRegistered = false; } @Override public String getScreenName() { return "Document Grid"; } private void initGridView() { mGridView = (GridView) findViewById(R.id.gridview); mDocumentAdapter = new DocumentGridAdapter(this, R.layout.item_grid_document_element, this); registerForContextMenu(mGridView); mGridView.setAdapter(mDocumentAdapter); mGridView.setLongClickable(true); mGridView.setOnItemClickListener(new DocumentClickListener()); mGridView.setOnItemLongClickListener(new DocumentLongClickListener()); mGridView.setOnScrollListener(new DocumentScrollListener()); mGridView.setOnTouchListener(new FingerTracker()); final int[] outNum = new int[1]; final int columnWidth = Util.determineThumbnailSize(this, outNum); mGridView.setColumnWidth(columnWidth); mGridView.setNumColumns(outNum[0]); final View emptyView = findViewById(R.id.empty_view); mGridView.setEmptyView(emptyView); } @Override protected int getParentId() { return -1; } public void cancelMultiSelectionMode() { mDocumentAdapter.getSelectedDocumentIds().clear(); sIsInSelectionMode = false; final int childCount = mGridView.getChildCount(); for (int i = 0; i < childCount; i++) { final View v = mGridView.getChildAt(i); final DocumentGridAdapter.DocumentViewHolder holder = (DocumentGridAdapter.DocumentViewHolder) v .getTag(); holder.gridElement.setChecked(false); } } @Override protected Dialog onCreateDialog(int id) { switch (id) { case JOIN_PROGRESS_DIALOG: ProgressDialog d = new ProgressDialog(this); d.setTitle(R.string.join_documents_title); d.setIndeterminate(true); return d; } return super.onCreateDialog(id); } @Override public Loader<Cursor> onCreateLoader(final int documentId, final Bundle bundle) { final Uri uri = Uri.withAppendedPath(DocumentContentProvider.CONTENT_URI, String.valueOf(documentId)); return new CursorLoader(this, uri, new String[] { DocumentContentProvider.Columns.TITLE, DocumentContentProvider.Columns.ID }, null, null, "created ASC"); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if (cursor.moveToFirst()) { final int titleIndex = cursor.getColumnIndex(DocumentContentProvider.Columns.TITLE); final String oldTitle = cursor.getString(titleIndex); final int idIndex = cursor.getColumnIndex(DocumentContentProvider.Columns.ID); final String documentId = String.valueOf(cursor.getInt(idIndex)); final Uri documentUri = Uri.withAppendedPath(DocumentContentProvider.CONTENT_URI, documentId); askUserForNewTitle(oldTitle, documentUri); } getSupportLoaderManager().destroyLoader(loader.getId()); } @Override public void onLoaderReset(Loader<Cursor> arg0) { } private void joinDocuments(final Set<Integer> selectedDocs) { new JoinDocumentsTask(selectedDocs, getApplicationContext()).execute(); } protected class JoinDocumentsTask extends AsyncTask<Void, Integer, Integer> { private Set<Integer> mIds = new HashSet<Integer>(); private final Context mContext; public JoinDocumentsTask(Set<Integer> ids, Context c) { mIds.addAll(ids); mContext = c; } @Override protected void onPreExecute() { super.onPreExecute(); showDialog(JOIN_PROGRESS_DIALOG); } @Override protected void onPostExecute(Integer result) { String msg = mContext.getString(R.string.join_documents_result); msg = String.format(msg, result); Toast.makeText(mContext, msg, Toast.LENGTH_LONG).show(); dismissDialog(JOIN_PROGRESS_DIALOG); } private String buidlInExpr(final Collection<Integer> ids) { final int length = ids.size(); int count = 0; StringBuilder builder = new StringBuilder(); builder.append(" in ("); for (@SuppressWarnings("unused") Integer id : ids) { builder.append("?"); if (count < length - 1) { builder.append(","); } count++; } builder.append(")"); return builder.toString(); } @Override protected Integer doInBackground(Void... params) { int count = 0; final Integer parentId = Collections.min(mIds); final int documentCount = mIds.size(); mIds.remove(parentId); String[] selectionArgs = new String[mIds.size() * 2]; for (Integer id : mIds) { selectionArgs[count++] = String.valueOf(id); } for (Integer id : mIds) { selectionArgs[count++] = String.valueOf(id); } StringBuilder builder = new StringBuilder(); final String inExpr = buidlInExpr(mIds); builder.append(DocumentContentProvider.Columns.ID); builder.append(inExpr); builder.append(" OR "); builder.append(DocumentContentProvider.Columns.PARENT_ID); builder.append(inExpr); String selection = builder.toString(); ContentValues values = new ContentValues(2); values.put(DocumentContentProvider.Columns.PARENT_ID, parentId); values.put(DocumentContentProvider.Columns.CHILD_COUNT, 0); int childCount = getContentResolver().update(DocumentContentProvider.CONTENT_URI, values, selection, selectionArgs); values.clear(); values.put(DocumentContentProvider.Columns.CHILD_COUNT, childCount); Uri parentDocumentUri = Uri.withAppendedPath(DocumentContentProvider.CONTENT_URI, String.valueOf(parentId)); getContentResolver().update(parentDocumentUri, values, null, null); return documentCount; } } }