Java tutorial
/* * Copyright (C) 2016 ?linson Santos Xavier <isoron@gmail.com> * * This file is part of Loop Habit Tracker. * * Loop Habit Tracker 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. * * Loop Habit Tracker 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 org.isoron.uhabits.activities; import android.content.*; import android.graphics.*; import android.graphics.drawable.*; import android.net.*; import android.os.*; import android.support.annotation.*; import android.support.design.widget.*; import android.support.v4.content.res.*; import android.support.v7.app.*; import android.support.v7.view.ActionMode; import android.support.v7.widget.Toolbar; import android.view.*; import android.widget.*; import org.isoron.uhabits.*; import org.isoron.uhabits.utils.*; import java.io.*; import static android.os.Build.VERSION.*; import static android.os.Build.VERSION_CODES.*; /** * Base class for all screens in the application. * <p> * Screens are responsible for deciding what root views and what menus should be * attached to the main window. They are also responsible for showing other * screens and for receiving their results. */ public class BaseScreen { protected BaseActivity activity; @Nullable private BaseRootView rootView; @Nullable private BaseSelectionMenu selectionMenu; private Snackbar snackbar; public BaseScreen(@NonNull BaseActivity activity) { this.activity = activity; } @Deprecated public static void setupActionBarColor(@NonNull AppCompatActivity activity, int color) { Toolbar toolbar = (Toolbar) activity.findViewById(R.id.toolbar); if (toolbar == null) return; activity.setSupportActionBar(toolbar); ActionBar actionBar = activity.getSupportActionBar(); if (actionBar == null) return; actionBar.setDisplayHomeAsUpEnabled(true); ColorDrawable drawable = new ColorDrawable(color); actionBar.setBackgroundDrawable(drawable); if (SDK_INT >= LOLLIPOP) { int darkerColor = ColorUtils.mixColors(color, Color.BLACK, 0.75f); activity.getWindow().setStatusBarColor(darkerColor); toolbar.setElevation(InterfaceUtils.dpToPixels(activity, 2)); View view = activity.findViewById(R.id.toolbarShadow); if (view != null) view.setVisibility(View.GONE); view = activity.findViewById(R.id.headerShadow); if (view != null) view.setVisibility(View.GONE); } } @Deprecated public static int getDefaultActionBarColor(Context context) { if (SDK_INT < LOLLIPOP) { return ResourcesCompat.getColor(context.getResources(), R.color.grey_900, context.getTheme()); } else { StyledResources res = new StyledResources(context); return res.getColor(R.attr.colorPrimary); } } /** * Notifies the screen that its contents should be updated. */ public void invalidate() { if (rootView == null) return; rootView.invalidate(); } public void invalidateToolbar() { if (rootView == null) return; activity.runOnUiThread(() -> { Toolbar toolbar = rootView.getToolbar(); activity.setSupportActionBar(toolbar); ActionBar actionBar = activity.getSupportActionBar(); if (actionBar == null) return; actionBar.setDisplayHomeAsUpEnabled(rootView.getDisplayHomeAsUp()); int color = rootView.getToolbarColor(); setActionBarColor(actionBar, color); setStatusBarColor(color); }); } /** * Called when another Activity has finished, and has returned some result. * * @param requestCode the request code originally supplied to {@link * android.app.Activity#startActivityForResult(Intent, * int, Bundle)}. * @param resultCode the result code sent by the other activity. * @param data an Intent containing extra data sent by the other * activity. * @see {@link android.app.Activity#onActivityResult(int, int, Intent)} */ public void onResult(int requestCode, int resultCode, Intent data) { } /** * Sets the menu to be shown by this screen. * <p> * This menu will be visible if when there is no active selection operation. * If the provided menu is null, then no menu will be shown. * * @param menu the menu to be shown. */ public void setMenu(@Nullable BaseMenu menu) { activity.setBaseMenu(menu); } /** * Sets the root view for this screen. * * @param rootView the root view for this screen. */ public void setRootView(@Nullable BaseRootView rootView) { this.rootView = rootView; activity.setContentView(rootView); if (rootView == null) return; invalidateToolbar(); } /** * Sets the menu to be shown when a selection is active on the screen. * * @param menu the menu to be shown during a selection */ public void setSelectionMenu(@Nullable BaseSelectionMenu menu) { this.selectionMenu = menu; } /** * Shows a message on the screen. * * @param stringId the string resource id for this message. */ public void showMessage(@StringRes Integer stringId) { if (stringId == null || rootView == null) return; if (snackbar == null) { snackbar = Snackbar.make(rootView, stringId, Snackbar.LENGTH_SHORT); int tvId = android.support.design.R.id.snackbar_text; TextView tv = (TextView) snackbar.getView().findViewById(tvId); tv.setTextColor(Color.WHITE); } else snackbar.setText(stringId); snackbar.show(); } public void showSendEmailScreen(@StringRes int toId, @StringRes int subjectId, String content) { String to = activity.getString(toId); String subject = activity.getString(subjectId); Intent intent = new Intent(); intent.setAction(Intent.ACTION_SEND); intent.setType("message/rfc822"); intent.putExtra(Intent.EXTRA_EMAIL, new String[] { to }); intent.putExtra(Intent.EXTRA_SUBJECT, subject); intent.putExtra(Intent.EXTRA_TEXT, content); activity.startActivity(intent); } public void showSendFileScreen(@NonNull String archiveFilename) { Intent intent = new Intent(); intent.setAction(Intent.ACTION_SEND); intent.setType("application/zip"); intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(archiveFilename))); activity.startActivity(intent); } /** * Instructs the screen to start a selection. * <p> * If a selection menu was provided, this menu will be shown instead of the * regular one. */ public void startSelection() { activity.startSupportActionMode(new ActionModeWrapper()); } private void setActionBarColor(@NonNull ActionBar actionBar, int color) { ColorDrawable drawable = new ColorDrawable(color); actionBar.setBackgroundDrawable(drawable); } private void setStatusBarColor(int baseColor) { if (SDK_INT < LOLLIPOP) return; int darkerColor = ColorUtils.mixColors(baseColor, Color.BLACK, 0.75f); activity.getWindow().setStatusBarColor(darkerColor); } private class ActionModeWrapper implements ActionMode.Callback { @Override public boolean onActionItemClicked(@Nullable ActionMode mode, @Nullable MenuItem item) { if (item == null || selectionMenu == null) return false; return selectionMenu.onItemClicked(item); } @Override public boolean onCreateActionMode(@Nullable ActionMode mode, @Nullable Menu menu) { if (selectionMenu == null) return false; if (mode == null || menu == null) return false; selectionMenu.onCreate(activity.getMenuInflater(), mode, menu); return true; } @Override public void onDestroyActionMode(@Nullable ActionMode mode) { if (selectionMenu == null) return; selectionMenu.onFinish(); } @Override public boolean onPrepareActionMode(@Nullable ActionMode mode, @Nullable Menu menu) { if (selectionMenu == null || menu == null) return false; return selectionMenu.onPrepare(menu); } } }