Java tutorial
/* * Copyright 2016 Stanislav Pintjuk * E-mail: stanislav.pintjuk@gmail.com * * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.launcher.silverfish.launcher.homescreen; import android.app.Activity; import android.appwidget.AppWidgetHostView; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProviderInfo; import android.content.ClipData; import android.content.ClipDescription; import android.content.ComponentName; import android.content.Intent; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.view.MotionEventCompat; import android.util.Log; import android.view.DragEvent; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.AlphaAnimation; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.launcher.silverfish.R; import com.launcher.silverfish.common.Constants; import com.launcher.silverfish.common.Utils; import com.launcher.silverfish.dbmodel.ShortcutTable; import com.launcher.silverfish.launcher.App; import com.launcher.silverfish.launcher.LauncherActivity; import com.launcher.silverfish.layouts.SquareGridLayout; import com.launcher.silverfish.models.AppDetail; import com.launcher.silverfish.shared.Settings; import com.launcher.silverfish.sqlite.LauncherSQLiteHelper; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.List; public class HomeScreenFragment extends Fragment { //region Fields LauncherSQLiteHelper sqlHelper; private Settings settings; // Constant variables for communication with AppWidgetManager final private int WIDGET_HOST_ID = 1339; final private int REQUEST_PICK_APPWIDGET = 1340; final private int REQUEST_CREATE_APPWIDGET = 1341; final private int REQUEST_BIND_APPWIDGET = 1342; private AppWidgetManager mAppWidgetManager; private LauncherAppWidgetHost mAppWidgetHost; private PackageManager mPacMan; private View rootView; private ArrayList<AppDetail> appsList; private SquareGridLayout shortcutLayout; // Save the last X and Y position on the touch events, for later calculating the speed of change private float lastX, lastY; private boolean touchConsumed; // Did we consume the touch event yet? This will avoid calling it twice private float touchSlop; //endregion //region Android lifecycle @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { sqlHelper = new LauncherSQLiteHelper((App) getActivity().getApplication()); settings = new Settings(getContext()); // Initiate global variables mAppWidgetManager = AppWidgetManager.getInstance(getActivity().getBaseContext()); mAppWidgetHost = new LauncherAppWidgetHost(getActivity().getApplicationContext(), WIDGET_HOST_ID); mAppWidgetHost.startListening(); mPacMan = getActivity().getPackageManager(); appsList = new ArrayList<>(); rootView = inflater.inflate(R.layout.activity_home, container, false); // Set touch slop and listen for touch events, such as swipe touchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); rootView.setOnTouchListener(onRootTouchListener); shortcutLayout = (SquareGridLayout) rootView.findViewById(R.id.shortcut_area); // Start listening for shortcut additions ((LauncherActivity) getActivity()).setFragShortcutAddListenerRefreshListener(new ShortcutAddListener() { @Override public void OnShortcutAdd(String appName) { // Insert it into the database and get the row id // TODO: Check if an error has occurred while inserting into database. if (sqlHelper.canAddShortcut(appName)) { long appId = sqlHelper.addShortcut(appName); // Create shortcut and add it ShortcutTable shortcut = new ShortcutTable(); shortcut.setPackageName(appName); shortcut.setId(appId); if (addAppToView(shortcut)) { updateShortcuts(); } } } }); addWidgetOnClickListener(); setOnDragListener(); setWidgetColors(settings.getWidgetBgColor(), settings.getFontFgColor()); setWidgetVisibility(settings.isWidgetVisible()); loadWidget(); loadApps(); updateShortcuts(); return rootView; } @Override public void onDestroy() { super.onDestroy(); mAppWidgetHost.stopListening(); } //endregion //region Manage apps and shortcuts private void loadApps() { List<ShortcutTable> shortcuts = sqlHelper.getAllShortcuts(); for (ShortcutTable shortcut : shortcuts) { if (!addAppToView(shortcut)) { // If the shortcut could not be added then the user has probably uninstalled it, // so we should remove it from the db Log.d("HomeFragment", "Removing shortcut " + shortcut.getPackageName() + " from db"); sqlHelper.removeShortcut(shortcut.getId()); } } } private boolean addAppToView(ShortcutTable shortcut) { try { ApplicationInfo appInfo = mPacMan.getApplicationInfo(shortcut.getPackageName(), PackageManager.GET_META_DATA); AppDetail appDetail = new AppDetail(); appDetail.label = mPacMan.getApplicationLabel(appInfo); // load the icon later in an async task appDetail.icon = null; appDetail.packageName = shortcut.getPackageName(); appDetail.id = shortcut.getId(); appsList.add(appDetail); return true; } catch (PackageManager.NameNotFoundException e) { return false; } } private void removeApp(int app_index, long app_id) { sqlHelper.removeShortcut(app_id); appsList.remove(app_index); } @SuppressWarnings("deprecation") private void updateShortcuts() { int count = appsList.size(); int size = (int) Math.ceil(Math.sqrt(count)); shortcutLayout.removeAllViews(); if (size == 0) { size = 1; } // Redraw the layout shortcutLayout.setSize(size); shortcutLayout.requestLayout(); shortcutLayout.invalidate(); for (int i = 0; i < appsList.size(); i++) { final AppDetail app = appsList.get(i); View convertView = getActivity().getLayoutInflater().inflate(R.layout.shortcut_item, null); // load the app icon in an async task ImageView im = (ImageView) convertView.findViewById(R.id.item_app_icon); Utils.loadAppIconAsync(mPacMan, app.packageName.toString(), im); TextView tv = (TextView) convertView.findViewById(R.id.item_app_label); tv.setText(app.label); shortcutLayout.addView(convertView); convertView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent event) { switch (MotionEventCompat.getActionMasked(event)) { case MotionEvent.ACTION_DOWN: updateTouchDown(event); break; case MotionEvent.ACTION_MOVE: tryConsumeSwipe(event); break; case MotionEvent.ACTION_UP: // We only want to launch the activity if the touch was not consumed yet! if (!touchConsumed) { Intent i = mPacMan.getLaunchIntentForPackage(app.packageName.toString()); if (i != null) { // Sanity check (application may have been uninstalled) // TODO Remove it from the database startActivity(i); } else { Toast.makeText(getContext(), R.string.application_not_installed, Toast.LENGTH_SHORT) .show(); } } break; } return touchConsumed; } }); // start a drag when an app has been long clicked final long appId = app.id; final int appIndex = i; convertView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { String[] mime_types = { ClipDescription.MIMETYPE_TEXT_PLAIN }; ClipData data = new ClipData(Constants.DRAG_SHORTCUT_REMOVAL, mime_types, new ClipData.Item(Long.toString(appId))); data.addItem(new ClipData.Item(Integer.toString(appIndex))); View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder( view.findViewById(R.id.item_app_icon)); // "This method was deprecated in API level 24. Use startDragAndDrop() // for newer platform versions." if (Build.VERSION.SDK_INT < 24) { view.startDrag(data, shadowBuilder, view, 0); } else { view.startDragAndDrop(data, shadowBuilder, view, 0); } // Show removal indicator FrameLayout rem_ind = (FrameLayout) rootView.findViewById(R.id.remove_indicator); rem_ind.setVisibility(View.VISIBLE); AlphaAnimation animation = new AlphaAnimation(0.0f, 1.0f); animation.setDuration(500); rem_ind.startAnimation(animation); return true; } }); } } //endregion //region Listeners private void setOnDragListener() { rootView.setOnDragListener(new View.OnDragListener() { @Override public boolean onDrag(View view, DragEvent dragEvent) { switch (dragEvent.getAction()) { case DragEvent.ACTION_DRAG_STARTED: // Check that it is a shortcut removal gesture ClipDescription cd = dragEvent.getClipDescription(); if (!cd.getLabel().toString().equals(Constants.DRAG_SHORTCUT_REMOVAL)) { return false; } break; case DragEvent.ACTION_DRAG_ENTERED: // Don't do anything break; case DragEvent.ACTION_DRAG_LOCATION: //Don't do anything break; case DragEvent.ACTION_DROP: // If outside of bound, remove the app if (Utils.onBottomCenterScreenEdge(getActivity(), dragEvent.getX(), dragEvent.getY())) { String appId = dragEvent.getClipData().getItemAt(0).getText().toString(); String appIndex = dragEvent.getClipData().getItemAt(1).getText().toString(); removeApp(Integer.parseInt(appIndex), Long.parseLong(appId)); updateShortcuts(); } break; case DragEvent.ACTION_DRAG_ENDED: // Hide the remove-indicator FrameLayout rem_ind = (FrameLayout) rootView.findViewById(R.id.remove_indicator); rem_ind.setVisibility(View.INVISIBLE); break; } return true; } }); } private void addWidgetOnClickListener() { // Long click on widget area should start up widget selection FrameLayout widget_area = (FrameLayout) rootView.findViewById(R.id.widget_area); widget_area.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { popupSelectWidget(); return true; } }); } //endregion //region Widgets //region Widget selection public void popupSelectWidget() { // Allocate widget id and start widget selection activity int appWidgetId = this.mAppWidgetHost.allocateAppWidgetId(); Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK); pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); addEmptyData(pickIntent); // This is needed work around some weird bug. startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET); } //endregion //region Widget creation private void createWidget(Intent data) { // Get the widget id Bundle extras = data.getExtras(); int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1); createWidgetFromId(appWidgetId); } private void createWidgetFromId(int widget_id) { AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(widget_id); // Create the host view AppWidgetHostView hostView = mAppWidgetHost.createView(getActivity().getBaseContext(), widget_id, appWidgetInfo); hostView.setAppWidget(widget_id, appWidgetInfo); // And place the widget in widget area and save. placeWidget(hostView); settings.setWidget(appWidgetInfo.provider.getPackageName(), appWidgetInfo.provider.getClassName()); } //endregion //region Widget loading private void loadWidget() { ComponentName cn = settings.getWidget(); Log.d("Widget creation", "Loaded from db: " + cn.getClassName() + " - " + cn.getPackageName()); // Check that there actually is a widget in the database if (cn.getPackageName().isEmpty() && cn.getClassName().isEmpty()) { Log.d("Widget creation", "DB was empty"); return; } Log.d("Widget creation", "DB was not empty"); final List<AppWidgetProviderInfo> infos = mAppWidgetManager.getInstalledProviders(); // Get AppWidgetProviderInfo AppWidgetProviderInfo appWidgetInfo = null; // Just in case you want to see all package and class names of installed widget providers, // this code is useful for (final AppWidgetProviderInfo info : infos) { Log.d("AD3", info.provider.getPackageName() + " / " + info.provider.getClassName()); } // Iterate through all infos, trying to find the desired one for (final AppWidgetProviderInfo info : infos) { if (info.provider.getClassName().equals(cn.getClassName()) && info.provider.getPackageName().equals(cn.getPackageName())) { // We found it! appWidgetInfo = info; break; } } if (appWidgetInfo == null) { Log.d("Widget creation", "app info was null"); return; // Stop here } // Allocate the hosted widget id int appWidgetId = mAppWidgetHost.allocateAppWidgetId(); boolean allowed_to_bind = mAppWidgetManager.bindAppWidgetIdIfAllowed(appWidgetId, cn); // Ask the user to allow this app to have access to their widgets if (!allowed_to_bind) { Log.d("Widget creation", "asking for permission"); Intent i = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND); Bundle args = new Bundle(); args.putInt(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); args.putParcelable(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER, cn); if (Build.VERSION.SDK_INT >= 21) { args.putParcelable(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER_PROFILE, null); } i.putExtras(args); startActivityForResult(i, REQUEST_BIND_APPWIDGET); return; } else { Log.d("Widget creation", "Allowed to bind"); Log.d("Widget creation", "creating widget"); //Intent i = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND); //createWidgetFromId(appWidgetId); } // Create the host view AppWidgetHostView hostView = mAppWidgetHost.createView(getActivity().getBaseContext(), appWidgetId, appWidgetInfo); // Set the desired widget hostView.setAppWidget(appWidgetId, appWidgetInfo); placeWidget(hostView); } //endregion //region Widget configuration private void configureWidget(Intent data) { // Get the selected widget information Bundle extras = data.getExtras(); int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1); AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId); if (appWidgetInfo.configure != null) { // If the widget wants to be configured then start its configuration activity Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE); intent.setComponent(appWidgetInfo.configure); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); startActivityForResult(intent, REQUEST_CREATE_APPWIDGET); } else { // Otherwise simply create it createWidget(data); } } //endregion //region Widget placing private void placeWidget(AppWidgetHostView hostView) { FrameLayout widget_area = (FrameLayout) rootView.findViewById(R.id.widget_area); widget_area.removeAllViews(); widget_area.addView(hostView); // Let the widget host view take control of the long click action. hostView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { popupSelectWidget(); return true; } }); hostView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent event) { switch (MotionEventCompat.getActionMasked(event)) { case MotionEvent.ACTION_DOWN: updateTouchDown(event); break; case MotionEvent.ACTION_MOVE: tryConsumeSwipe(event); break; } return touchConsumed; } }); } //endregion //region Widget bugs workarounds private void addEmptyData(Intent pickIntent) { // This is needed work around some weird bug. // This will simply add some empty data to the intent. ArrayList customInfo = new ArrayList(); pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo); ArrayList customExtras = new ArrayList(); pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras); } //endregion //endregion //region Events @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // listen for widget manager response if (resultCode == Activity.RESULT_OK) { if (requestCode == REQUEST_PICK_APPWIDGET) { configureWidget(data); } else if (requestCode == REQUEST_CREATE_APPWIDGET) { createWidget(data); } else if (requestCode == REQUEST_BIND_APPWIDGET) { createWidget(data); } } else if (resultCode == Activity.RESULT_CANCELED && data != null) { int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1); if (appWidgetId != -1) { mAppWidgetHost.deleteAppWidgetId(appWidgetId); } } } final View.OnTouchListener onRootTouchListener = new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent event) { switch (MotionEventCompat.getActionMasked(event)) { case MotionEvent.ACTION_DOWN: updateTouchDown(event); break; case MotionEvent.ACTION_MOVE: tryConsumeSwipe(event); break; } return true; } }; //endregion //region UI public void setWidgetVisibility(boolean visible) { final FrameLayout widgetArea = (FrameLayout) rootView.findViewById(R.id.widget_area); widgetArea.setVisibility(visible ? View.VISIBLE : View.GONE); } public void setWidgetColors(int background, int foreground) { final FrameLayout widgetArea = (FrameLayout) rootView.findViewById(R.id.widget_area); final TextView noWidgetNotice = (TextView) rootView.findViewById(R.id.no_widget_notice); widgetArea.setBackgroundColor(background); // The no-widget notice will be null if a widget is set if (noWidgetNotice != null) noWidgetNotice.setTextColor(foreground); } void updateTouchDown(MotionEvent event) { lastX = event.getX(); lastY = event.getY(); touchConsumed = false; } void tryConsumeSwipe(MotionEvent event) { if (!touchConsumed) { // Also subtract the X: we want to trigger if we scroll down, not to the sides float downSpeed = event.getY() - lastY - Math.abs(lastX - event.getX()); if (downSpeed > touchSlop) { // The user swiped down, show the status bar and consume the event expandNotificationPanel(); touchConsumed = true; } else { updateTouchDown(event); } } } void expandNotificationPanel() { try { //noinspection WrongConstant Object service = getActivity().getSystemService("statusbar"); Class<?> clazz = Class.forName("android.app.StatusBarManager"); Method expand = Build.VERSION.SDK_INT <= 16 ? clazz.getMethod("expand") : clazz.getMethod("expandNotificationsPanel"); expand.invoke(service); } catch (Exception localException) { localException.printStackTrace(); } } //endregion }