Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * 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.android.gallery3d2.ingest; import android.app.Activity; import android.app.ProgressDialog; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.content.res.Configuration; import android.database.DataSetObserver; import android.mtp.MtpObjectInfo; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.support.v4.view.ViewPager; import android.util.SparseBooleanArray; import android.view.ActionMode; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.TextView; import com.android.gallery3d2.R; import com.android.gallery3d2.ingest.adapter.CheckBroker; import com.android.gallery3d2.ingest.adapter.MtpAdapter; import com.android.gallery3d2.ingest.adapter.MtpPagerAdapter; import com.android.gallery3d2.ingest.data.MtpBitmapFetch; import com.android.gallery3d2.ingest.ui.DateTileView; import com.android.gallery3d2.ingest.ui.IngestGridView; import com.android.gallery3d2.ingest.ui.IngestGridView.OnClearChoicesListener; import java.lang.ref.WeakReference; import java.util.Collection; public class IngestActivity extends Activity implements MtpDeviceIndex.ProgressListener, ImportTask.Listener { private IngestService mHelperService; private boolean mActive = false; private IngestGridView mGridView; private MtpAdapter mAdapter; private Handler mHandler; private ProgressDialog mProgressDialog; private ActionMode mActiveActionMode; private View mWarningView; private TextView mWarningText; private int mLastCheckedPosition = 0; private ViewPager mFullscreenPager; private MtpPagerAdapter mPagerAdapter; private boolean mFullscreenPagerVisible = false; private MenuItem mMenuSwitcherItem; private MenuItem mActionMenuSwitcherItem; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); doBindHelperService(); setContentView(R.layout.ingest_activity_item_list); mGridView = (IngestGridView) findViewById(R.id.ingest_gridview); mAdapter = new MtpAdapter(this); mAdapter.registerDataSetObserver(mMasterObserver); mGridView.setAdapter(mAdapter); mGridView.setMultiChoiceModeListener(mMultiChoiceModeListener); mGridView.setOnItemClickListener(mOnItemClickListener); mGridView.setOnClearChoicesListener(mPositionMappingCheckBroker); mFullscreenPager = (ViewPager) findViewById(R.id.ingest_view_pager); mHandler = new ItemListHandler(this); MtpBitmapFetch.configureForContext(this); } private OnItemClickListener mOnItemClickListener = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View itemView, int position, long arg3) { mLastCheckedPosition = position; mGridView.setItemChecked(position, !mGridView.getCheckedItemPositions().get(position)); } }; private MultiChoiceModeListener mMultiChoiceModeListener = new MultiChoiceModeListener() { private boolean mIgnoreItemCheckedStateChanges = false; private void updateSelectedTitle(ActionMode mode) { int count = mGridView.getCheckedItemCount(); mode.setTitle(getResources().getQuantityString(R.plurals.number_of_items_selected, count, count)); } @Override public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { if (mIgnoreItemCheckedStateChanges) return; if (mAdapter.itemAtPositionIsBucket(position)) { SparseBooleanArray checkedItems = mGridView.getCheckedItemPositions(); mIgnoreItemCheckedStateChanges = true; mGridView.setItemChecked(position, false); // Takes advantage of the fact that SectionIndexer imposes the // need to clamp to the valid range int nextSectionStart = mAdapter.getPositionForSection(mAdapter.getSectionForPosition(position) + 1); if (nextSectionStart == position) nextSectionStart = mAdapter.getCount(); boolean rangeValue = false; // Value we want to set all of the bucket items to // Determine if all the items in the bucket are currently checked, so that we // can uncheck them, otherwise we will check all items in the bucket. for (int i = position + 1; i < nextSectionStart; i++) { if (checkedItems.get(i) == false) { rangeValue = true; break; } } // Set all items in the bucket to the desired state for (int i = position + 1; i < nextSectionStart; i++) { if (checkedItems.get(i) != rangeValue) mGridView.setItemChecked(i, rangeValue); } mPositionMappingCheckBroker.onBulkCheckedChange(); mIgnoreItemCheckedStateChanges = false; } else { mPositionMappingCheckBroker.onCheckedChange(position, checked); } mLastCheckedPosition = position; updateSelectedTitle(mode); } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { return onOptionsItemSelected(item); } @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.ingest_menu_item_list_selection, menu); updateSelectedTitle(mode); mActiveActionMode = mode; mActionMenuSwitcherItem = menu.findItem(R.id.ingest_switch_view); setSwitcherMenuState(mActionMenuSwitcherItem, mFullscreenPagerVisible); return true; } @Override public void onDestroyActionMode(ActionMode mode) { mActiveActionMode = null; mActionMenuSwitcherItem = null; mHandler.sendEmptyMessage(ItemListHandler.MSG_BULK_CHECKED_CHANGE); } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { updateSelectedTitle(mode); return false; } }; public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.import_items: if (mActiveActionMode != null) { mHelperService.importSelectedItems(mGridView.getCheckedItemPositions(), mAdapter); mActiveActionMode.finish(); } return true; case R.id.ingest_switch_view: setFullscreenPagerVisibility(!mFullscreenPagerVisible); return true; default: return false; } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.ingest_menu_item_list_selection, menu); mMenuSwitcherItem = menu.findItem(R.id.ingest_switch_view); menu.findItem(R.id.import_items).setVisible(false); setSwitcherMenuState(mMenuSwitcherItem, mFullscreenPagerVisible); return true; } @Override protected void onDestroy() { super.onDestroy(); doUnbindHelperService(); } @Override protected void onResume() { DateTileView.refreshLocale(); mActive = true; if (mHelperService != null) mHelperService.setClientActivity(this); updateWarningView(); super.onResume(); } @Override protected void onPause() { if (mHelperService != null) mHelperService.setClientActivity(null); mActive = false; cleanupProgressDialog(); super.onPause(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); MtpBitmapFetch.configureForContext(this); } private void showWarningView(int textResId) { if (mWarningView == null) { mWarningView = findViewById(R.id.ingest_warning_view); mWarningText = (TextView) mWarningView.findViewById(R.id.ingest_warning_view_text); } mWarningText.setText(textResId); mWarningView.setVisibility(View.VISIBLE); setFullscreenPagerVisibility(false); mGridView.setVisibility(View.GONE); } private void hideWarningView() { if (mWarningView != null) { mWarningView.setVisibility(View.GONE); setFullscreenPagerVisibility(false); } } private PositionMappingCheckBroker mPositionMappingCheckBroker = new PositionMappingCheckBroker(); private class PositionMappingCheckBroker extends CheckBroker implements OnClearChoicesListener { private int mLastMappingPager = -1; private int mLastMappingGrid = -1; private int mapPagerToGridPosition(int position) { if (position != mLastMappingPager) { mLastMappingPager = position; mLastMappingGrid = mAdapter.translatePositionWithoutLabels(position); } return mLastMappingGrid; } private int mapGridToPagerPosition(int position) { if (position != mLastMappingGrid) { mLastMappingGrid = position; mLastMappingPager = mPagerAdapter.translatePositionWithLabels(position); } return mLastMappingPager; } @Override public void setItemChecked(int position, boolean checked) { mGridView.setItemChecked(mapPagerToGridPosition(position), checked); } @Override public void onCheckedChange(int position, boolean checked) { if (mPagerAdapter != null) { super.onCheckedChange(mapGridToPagerPosition(position), checked); } } @Override public boolean isItemChecked(int position) { return mGridView.getCheckedItemPositions().get(mapPagerToGridPosition(position)); } @Override public void onClearChoices() { onBulkCheckedChange(); } }; private DataSetObserver mMasterObserver = new DataSetObserver() { @Override public void onChanged() { if (mPagerAdapter != null) mPagerAdapter.notifyDataSetChanged(); } @Override public void onInvalidated() { if (mPagerAdapter != null) mPagerAdapter.notifyDataSetChanged(); } }; private int pickFullscreenStartingPosition() { int firstVisiblePosition = mGridView.getFirstVisiblePosition(); if (mLastCheckedPosition <= firstVisiblePosition || mLastCheckedPosition > mGridView.getLastVisiblePosition()) { return firstVisiblePosition; } else { return mLastCheckedPosition; } } private void setSwitcherMenuState(MenuItem menuItem, boolean inFullscreenMode) { if (menuItem == null) return; if (!inFullscreenMode) { menuItem.setIcon(android.R.drawable.ic_menu_zoom); menuItem.setTitle(R.string.switch_photo_fullscreen); } else { menuItem.setIcon(android.R.drawable.ic_dialog_dialer); menuItem.setTitle(R.string.switch_photo_grid); } } private void setFullscreenPagerVisibility(boolean visible) { mFullscreenPagerVisible = visible; if (visible) { if (mPagerAdapter == null) { mPagerAdapter = new MtpPagerAdapter(this, mPositionMappingCheckBroker); mPagerAdapter.setMtpDeviceIndex(mAdapter.getMtpDeviceIndex()); } mFullscreenPager.setAdapter(mPagerAdapter); mFullscreenPager.setCurrentItem( mPagerAdapter.translatePositionWithLabels(pickFullscreenStartingPosition()), false); } else if (mPagerAdapter != null) { mGridView.setSelection(mAdapter.translatePositionWithoutLabels(mFullscreenPager.getCurrentItem())); mFullscreenPager.setAdapter(null); } mGridView.setVisibility(visible ? View.INVISIBLE : View.VISIBLE); mFullscreenPager.setVisibility(visible ? View.VISIBLE : View.INVISIBLE); if (mActionMenuSwitcherItem != null) { setSwitcherMenuState(mActionMenuSwitcherItem, visible); } setSwitcherMenuState(mMenuSwitcherItem, visible); } private void updateWarningView() { if (!mAdapter.deviceConnected()) { showWarningView(R.string.ingest_no_device); } else if (mAdapter.indexReady() && mAdapter.getCount() == 0) { showWarningView(R.string.ingest_empty_device); } else { hideWarningView(); } } private void UiThreadNotifyIndexChanged() { mAdapter.notifyDataSetChanged(); if (mActiveActionMode != null) { mActiveActionMode.finish(); mActiveActionMode = null; } updateWarningView(); } protected void notifyIndexChanged() { mHandler.sendEmptyMessage(ItemListHandler.MSG_NOTIFY_CHANGED); } private static class ProgressState { String message; String title; int current; int max; public void reset() { title = null; message = null; current = 0; max = 0; } } private ProgressState mProgressState = new ProgressState(); @Override public void onObjectIndexed(MtpObjectInfo object, int numVisited) { // Not guaranteed to be called on the UI thread mProgressState.reset(); mProgressState.max = 0; mProgressState.message = getResources().getQuantityString(R.plurals.ingest_number_of_items_scanned, numVisited, numVisited); mHandler.sendEmptyMessage(ItemListHandler.MSG_PROGRESS_UPDATE); } @Override public void onSorting() { // Not guaranteed to be called on the UI thread mProgressState.reset(); mProgressState.max = 0; mProgressState.message = getResources().getString(R.string.ingest_sorting); mHandler.sendEmptyMessage(ItemListHandler.MSG_PROGRESS_UPDATE); } @Override public void onIndexFinish() { // Not guaranteed to be called on the UI thread mHandler.sendEmptyMessage(ItemListHandler.MSG_PROGRESS_HIDE); mHandler.sendEmptyMessage(ItemListHandler.MSG_NOTIFY_CHANGED); } @Override public void onImportProgress(final int visitedCount, final int totalCount, String pathIfSuccessful) { // Not guaranteed to be called on the UI thread mProgressState.reset(); mProgressState.max = totalCount; mProgressState.current = visitedCount; mProgressState.title = getResources().getString(R.string.ingest_importing); mHandler.sendEmptyMessage(ItemListHandler.MSG_PROGRESS_UPDATE); } @Override public void onImportFinish(Collection<MtpObjectInfo> objectsNotImported, int numVisited) { // Not guaranteed to be called on the UI thread mHandler.sendEmptyMessage(ItemListHandler.MSG_PROGRESS_HIDE); // TODO: maybe show an extra dialog listing the ones that failed // importing, if any? } private ProgressDialog getProgressDialog() { if (mProgressDialog == null || !mProgressDialog.isShowing()) { mProgressDialog = new ProgressDialog(this); mProgressDialog.setCancelable(false); } return mProgressDialog; } private void updateProgressDialog() { ProgressDialog dialog = getProgressDialog(); boolean indeterminate = (mProgressState.max == 0); dialog.setIndeterminate(indeterminate); dialog.setProgressStyle(indeterminate ? ProgressDialog.STYLE_SPINNER : ProgressDialog.STYLE_HORIZONTAL); if (mProgressState.title != null) { dialog.setTitle(mProgressState.title); } if (mProgressState.message != null) { dialog.setMessage(mProgressState.message); } if (!indeterminate) { dialog.setProgress(mProgressState.current); dialog.setMax(mProgressState.max); } if (!dialog.isShowing()) { dialog.show(); } } private void cleanupProgressDialog() { if (mProgressDialog != null) { mProgressDialog.hide(); mProgressDialog = null; } } // This is static and uses a WeakReference in order to avoid leaking the Activity private static class ItemListHandler extends Handler { public static final int MSG_PROGRESS_UPDATE = 0; public static final int MSG_PROGRESS_HIDE = 1; public static final int MSG_NOTIFY_CHANGED = 2; public static final int MSG_BULK_CHECKED_CHANGE = 3; WeakReference<IngestActivity> mParentReference; public ItemListHandler(IngestActivity parent) { super(); mParentReference = new WeakReference<IngestActivity>(parent); } public void handleMessage(Message message) { IngestActivity parent = mParentReference.get(); if (parent == null || !parent.mActive) return; switch (message.what) { case MSG_PROGRESS_HIDE: parent.cleanupProgressDialog(); break; case MSG_PROGRESS_UPDATE: parent.updateProgressDialog(); break; case MSG_NOTIFY_CHANGED: parent.UiThreadNotifyIndexChanged(); break; case MSG_BULK_CHECKED_CHANGE: parent.mPositionMappingCheckBroker.onBulkCheckedChange(); break; default: break; } } } private ServiceConnection mHelperServiceConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { mHelperService = ((IngestService.LocalBinder) service).getService(); mHelperService.setClientActivity(IngestActivity.this); MtpDeviceIndex index = mHelperService.getIndex(); mAdapter.setMtpDeviceIndex(index); if (mPagerAdapter != null) mPagerAdapter.setMtpDeviceIndex(index); } public void onServiceDisconnected(ComponentName className) { mHelperService = null; } }; private void doBindHelperService() { bindService(new Intent(getApplicationContext(), IngestService.class), mHelperServiceConnection, Context.BIND_AUTO_CREATE); } private void doUnbindHelperService() { if (mHelperService != null) { mHelperService.setClientActivity(null); unbindService(mHelperServiceConnection); } } }