Java tutorial
/* * Copyright (C) 2013 Slimroms * Copyright (C) 2011 AOKP * 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.settings.aoip; import android.app.Activity; import android.app.DialogFragment; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProviderInfo; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager.NameNotFoundException; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.os.Parcelable; import android.provider.Settings; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.SimpleOnPageChangeListener; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.TextView; import android.widget.LinearLayout.LayoutParams; import com.android.settings.R; import java.util.ArrayList; public class WidgetsConfiguration extends DialogFragment { private static final String TAG = "Widget"; public static final String ACTION_ALLOCATE_ID = "com.android.systemui.ACTION_ALLOCATE_ID"; public static final String ACTION_DEALLOCATE_ID = "com.android.systemui.ACTION_DEALLOCATE_ID"; public static final String ACTION_SEND_ID = "com.android.systemui.ACTION_SEND_ID"; public static final String ACTION_DELETE_WIDGETS = "com.android.systemui.ACTION_DELETE_WIDGETS"; private ViewPager mViewPager; WidgetPagerAdapter mAdapter; Context mContext; TextView mTitle; TextView mSummary; AppWidgetManager mAppWidgetManager; View mPrefView; ArrayList<NavBarWidget> mWidgets = new ArrayList<NavBarWidget>(); protected int mCurrentPage; BroadcastReceiver mWidgetIdReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { int widgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); if (widgetId == AppWidgetManager.INVALID_APPWIDGET_ID) { return; } // Need to De-Allocate the ID that this was replacing. if (mWidgets.get(mCurrentPage).getWidgetId() != -1) { Intent delete = new Intent(); int dealloc = mWidgets.get(mCurrentPage).getWidgetId(); delete.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, dealloc); delete.setAction(ACTION_DEALLOCATE_ID); mContext.sendBroadcast(delete); mWidgets.remove(mCurrentPage); } mWidgets.add(mCurrentPage, new NavBarWidget(widgetId)); saveWidgets(); refreshParams(); mViewPager.setCurrentItem(mCurrentPage); }; }; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mPrefView = inflater.inflate(R.layout.navbar_widgets, container, false); mViewPager = (ViewPager) mPrefView.findViewById(R.id.pager); mCurrentPage = 0; ImageButton widgetbutton = (ImageButton) mPrefView.findViewById(R.id.button_shift_left); widgetbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { shiftleftWidget(mCurrentPage); } }); widgetbutton = (ImageButton) mPrefView.findViewById(R.id.button_shift_right); widgetbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { shiftrightWidget(mCurrentPage); } }); widgetbutton = (ImageButton) mPrefView.findViewById(R.id.button_delete); widgetbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { removeWidget(mCurrentPage); } }); widgetbutton = (ImageButton) mPrefView.findViewById(R.id.button_reset_widgets); widgetbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { resetNavBarWidgets(); } }); mTitle = (TextView) mPrefView.findViewById(R.id.title); mSummary = (TextView) mPrefView.findViewById(R.id.summary); return mPrefView; } @Override public void onResume() { super.onResume(); refreshParams(); mViewPager.setCurrentItem(mCurrentPage); } @Override public void onPause() { super.onPause(); refreshParams(); mViewPager.setCurrentItem(mCurrentPage); } @Override public void onAttach(Activity activity) { super.onAttach(activity); mContext = activity.getApplicationContext(); IntentFilter filter = new IntentFilter(ACTION_SEND_ID); mContext.registerReceiver(mWidgetIdReceiver, filter); mAppWidgetManager = AppWidgetManager.getInstance(mContext); } @Override public void onDetach() { super.onDetach(); mContext.unregisterReceiver(mWidgetIdReceiver); } private void shiftleftWidget(int page) { if (page > 0 && mWidgets.size() > 1 && (page < mWidgets.size() - 1)) { NavBarWidget moveme = mWidgets.remove(page); mWidgets.add(page - 1, moveme); saveWidgets(); mCurrentPage = page - 1; refreshParams(); mViewPager.setCurrentItem(mCurrentPage); } } private void shiftrightWidget(int page) { if (page < (mWidgets.size() - 2) && mWidgets.size() > 1) { NavBarWidget moveme = mWidgets.remove(page); mWidgets.add(page + 1, moveme); saveWidgets(); mCurrentPage = page + 1; refreshParams(); mViewPager.setCurrentItem(mCurrentPage); } } private void removeWidget(int page) { if (page < (mWidgets.size() - 1)) { NavBarWidget removedWidget = mWidgets.remove(page); saveWidgets(); refreshParams(); // remove in system ui Intent delete = new Intent(); delete.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, removedWidget.getWidgetId()); delete.setAction(ACTION_DEALLOCATE_ID); mContext.sendBroadcast(delete); mViewPager.setCurrentItem(page); } } private ArrayList<NavBarWidget> inflateWidgets() { ArrayList<NavBarWidget> widgets = new ArrayList<NavBarWidget>(); String settingWidgets = Settings.System.getString(mContext.getContentResolver(), Settings.System.NAVIGATION_BAR_WIDGETS); if (settingWidgets != null && settingWidgets.length() > 0) { String[] split = settingWidgets.split("\\|"); widgets.ensureCapacity(split.length + 1); for (int i = 0; i < split.length; i++) { int appWidgetId = Integer.parseInt(split[i]); widgets.add(new NavBarWidget(appWidgetId)); } } widgets.add(new NavBarWidget(-1)); // add +1 button! return widgets; } private void refreshParams() { if (mViewPager != null) { if (mAdapter == null) { mWidgets = inflateWidgets(); mViewPager.setAdapter(mAdapter = new WidgetPagerAdapter()); mViewPager.setOnPageChangeListener(mNewPageListener); } else { mViewPager.setAdapter(mAdapter); } int dp = mAdapter.getHeight(mViewPager.getCurrentItem()); float px = dp * mContext.getResources().getDisplayMetrics().density; mViewPager.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, (int) px)); updateSummary(mCurrentPage); } } View.OnClickListener mDoPrefClick = new View.OnClickListener() { public void onClick(View v) { requestNewWidget(); }; }; private void requestNewWidget() { // send intent to pick a new widget Intent send = new Intent(); send.setAction(ACTION_ALLOCATE_ID); mContext.sendBroadcast(send); } private void saveWidgets() { StringBuilder widgetString = new StringBuilder(); int numwidgets = mWidgets.size() - 1; // adjust for add button for (int i = 0; i < (numwidgets); i++) { widgetString.append(mWidgets.get(i).getWidgetId()); if (i != (numwidgets - 1)) // zero based adjustment widgetString.append("|"); } Settings.System.putString(mContext.getContentResolver(), Settings.System.NAVIGATION_BAR_WIDGETS, widgetString.toString()); } public void resetNavBarWidgets() { Intent delete = new Intent(); delete.setAction(ACTION_DELETE_WIDGETS); mContext.sendBroadcast(delete); Settings.System.putString(mContext.getContentResolver(), Settings.System.NAVIGATION_BAR_WIDGETS, ""); mWidgets = inflateWidgets(); refreshParams(); mAdapter.notifyDataSetChanged(); mViewPager.setCurrentItem(mCurrentPage = 0); } private void updateSummary(int page) { int widgets = mWidgets.size() - 1; if (widgets > page) { mSummary.setText(String.format(mContext.getResources().getString(R.string.navbar_widget_summary), (page + 1), widgets)); mTitle.setText(mWidgets.get(page).mTitle); } else { mSummary.setText(mContext.getResources().getString(R.string.navbar_widget_summary_add)); mTitle.setText(""); } mPrefView.invalidate(); // force redraw } public SimpleOnPageChangeListener mNewPageListener = new SimpleOnPageChangeListener() { @Override public void onPageSelected(int page) { int dp = mAdapter.getHeight(page); float px = dp * mContext.getResources().getDisplayMetrics().density; mCurrentPage = page; mViewPager.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, (int) px)); updateSummary(page); } }; public class WidgetPagerAdapter extends PagerAdapter { public WidgetPagerAdapter() { } @Override public int getCount() { if (mWidgets == null) { return 0; } else { return mWidgets.size(); } } public int getHeight(int pos) { if (mWidgets == null) { return -1; } if (pos < mWidgets.size()) { if (mWidgets != null && mWidgets.get(pos) != null) { int validHeight = mWidgets.get(pos).getHeight(); return validHeight; } } return -1; } /** * Create the page for the given position. The adapter is responsible for * adding the view to the container given here, although it only must ensure * this is done by the time it returns from {@link #finishUpdate()}. * * @param container The containing View in which the page will be shown. * @param position The page position to be instantiated. * @return Returns an Object representing the new page. This does not need * to be a View, but can be some other container of the page. */ @Override public Object instantiateItem(ViewGroup collection, int position) { if (position > (mWidgets.size() - 1)) return null; View v = mWidgets.get(position).getView(); if (v.getParent() != null) { // there is a case where shifting views could result in a view being re-added yet // still having a parent. ViewGroup vparent = (ViewGroup) v.getParent(); vparent.removeView(v); } v.setOnClickListener(mDoPrefClick); collection.addView(v); return v; } /** * Remove a page for the given position. The adapter is responsible for * removing the view from its container, although it only must ensure this * is done by the time it returns from {@link #finishUpdate()}. * * @param container The containing View from which the page will be removed. * @param position The page position to be removed. * @param object The same object that was returned by * {@link #instantiateItem(View, int)}. */ @Override public void destroyItem(View collection, int position, Object view) { ((ViewPager) collection).removeView((View) view); } @Override public boolean isViewFromObject(View view, Object object) { if (object instanceof NavBarWidget) { return ((NavBarWidget) object).getView().equals(view); } return view == ((View) object); } /** * Called when the a change in the shown pages has been completed. At this * point you must ensure that all of the pages have actually been added or * removed from the container as appropriate. * * @param container The containing View which is displaying this adapter's * page views. */ @Override public void finishUpdate(View arg0) { } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } } public class NavBarWidget { int mWidgetId; int mHeight; ImageView mView = null; Drawable mPreview = null; String mTitle; public NavBarWidget(int appWidgetId) { mWidgetId = appWidgetId; if (appWidgetId == -1) { mPreview = mContext.getResources().getDrawable(R.drawable.widget_add); mHeight = mPreview.getMinimumHeight(); mTitle = mContext.getResources().getString(R.string.navbar_widget_summary_add); } else { AppWidgetProviderInfo info = mAppWidgetManager.getAppWidgetInfo(mWidgetId); if (info == null) { mPreview = mContext.getResources().getDrawable(R.drawable.widget_na); mHeight = mPreview.getMinimumHeight(); } else { mHeight = info.minHeight; mTitle = info.label; mPreview = mContext.getPackageManager().getDrawable(info.provider.getPackageName(), info.previewImage, null); if (mPreview == null) { try { mPreview = mContext.getPackageManager() .getApplicationIcon(info.provider.getPackageName()); } catch (NameNotFoundException e) { mPreview = mContext.getResources().getDrawable(R.drawable.widget_na); } } } } mView = new ImageView(mContext); mView.setImageDrawable(mPreview); } public ImageView getView() { if (mView == null) { mView = new ImageView(mContext); mView.setImageDrawable(getWidgetPreviewDrawable()); } return mView; } public int getWidgetId() { return mWidgetId; } public int getHeight() { return mHeight; } public Drawable getWidgetPreviewDrawable() { return mPreview; } } }