Java tutorial
/* * Copyright (C) 2016 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.launcher3; import android.app.Activity; import android.app.Fragment; import android.app.SearchManager; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProviderInfo; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.graphics.Rect; import android.os.Bundle; import android.support.v4.content.ContextCompat; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.RelativeLayout; import com.android.launcher3.compat.AppWidgetManagerCompat; /** * A frame layout which contains a QSB. This internally uses fragment to bind the view, which * allows it to contain the logic for {@link Fragment#startActivityForResult(Intent, int)}. */ public class QsbContainerView extends FrameLayout { public QsbContainerView(Context context) { super(context); } public QsbContainerView(Context context, AttributeSet attrs) { super(context, attrs); } public QsbContainerView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public void setPadding(int left, int top, int right, int bottom) { super.setPadding(0, 0, 0, 0); } /** * A fragment to display the QSB. */ public static class QsbFragment extends Fragment implements View.OnClickListener { private static final int REQUEST_BIND_QSB = 1; private static final String QSB_WIDGET_ID = "qsb_widget_id"; private static int sSavedWidgetId = -1; private AppWidgetProviderInfo mWidgetInfo; private LauncherAppWidgetHostView mQsb; private BroadcastReceiver mRebindReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { rebindFragment(); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); IntentFilter filter = new IntentFilter(Launcher.ACTION_APPWIDGET_HOST_RESET); filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED); getActivity().registerReceiver(mRebindReceiver, filter); } private FrameLayout mWrapper; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (savedInstanceState != null) { sSavedWidgetId = savedInstanceState.getInt(QSB_WIDGET_ID, -1); } mWrapper = new FrameLayout(getActivity()); if (Utilities.isAllowPersisentSearchBarPrefEnabled(getActivity().getApplicationContext())) { mWrapper.addView(createQsb(inflater, mWrapper)); } mWrapper.setVisibility(INVISIBLE); return mWrapper; } private View createQsb(LayoutInflater inflater, ViewGroup container) { Launcher launcher = Launcher.getLauncher(getActivity()); mWidgetInfo = getSearchWidgetProvider(launcher); if (mWidgetInfo == null) { // There is no search provider, just show the default widget. return getDefaultView(inflater, container, false); } SharedPreferences prefs = Utilities.getPrefs(launcher); AppWidgetManagerCompat widgetManager = AppWidgetManagerCompat.getInstance(launcher); LauncherAppWidgetHost widgetHost = launcher.getAppWidgetHost(); InvariantDeviceProfile idp = LauncherAppState.getInstance().getInvariantDeviceProfile(); Bundle opts = new Bundle(); Rect size = AppWidgetResizeFrame.getWidgetSizeRanges(launcher, idp.numColumns, 1, null); opts.putInt(AppWidgetManager.OPTION_APPWIDGET_MIN_WIDTH, size.left); opts.putInt(AppWidgetManager.OPTION_APPWIDGET_MIN_HEIGHT, size.top); opts.putInt(AppWidgetManager.OPTION_APPWIDGET_MAX_WIDTH, size.right); opts.putInt(AppWidgetManager.OPTION_APPWIDGET_MAX_HEIGHT, size.bottom); int widgetId = prefs.getInt(QSB_WIDGET_ID, -1); AppWidgetProviderInfo widgetInfo = widgetManager.getAppWidgetInfo(widgetId); boolean isWidgetBound = (widgetInfo != null) && widgetInfo.provider.equals(mWidgetInfo.provider); if (!isWidgetBound) { // widgetId is already bound and its not the correct provider. // Delete the widget id. if (widgetId > -1) { widgetHost.deleteAppWidgetId(widgetId); widgetId = -1; } widgetId = widgetHost.allocateAppWidgetId(); isWidgetBound = widgetManager.bindAppWidgetIdIfAllowed(widgetId, mWidgetInfo, opts); if (!isWidgetBound) { widgetHost.deleteAppWidgetId(widgetId); widgetId = -1; } } if (isWidgetBound) { mQsb = (LauncherAppWidgetHostView) widgetHost.createView(launcher, widgetId, mWidgetInfo); mQsb.setId(R.id.qsb_widget); mQsb.mErrorViewId = R.layout.qsb_default_view; if (!Utilities.containsAll(AppWidgetManager.getInstance(launcher).getAppWidgetOptions(widgetId), opts)) { mQsb.updateAppWidgetOptions(opts); } mQsb.setPadding(0, 0, 0, 0); return mQsb; } // Return a default widget with setup icon. return getDefaultView(inflater, container, true); } @Override public void onClick(View view) { if (view.getId() == R.id.btn_qsb_search) { getActivity().startSearch("", false, null, true); } else if (view.getId() == R.id.btn_qsb_setup) { // Allocate a new widget id for QSB sSavedWidgetId = Launcher.getLauncher(getActivity()).getAppWidgetHost().allocateAppWidgetId(); // Start intent for bind the widget Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, sSavedWidgetId); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER, mWidgetInfo.provider); startActivityForResult(intent, REQUEST_BIND_QSB); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(QSB_WIDGET_ID, sSavedWidgetId); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_BIND_QSB) { if (resultCode == Activity.RESULT_OK) { int widgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, sSavedWidgetId); Utilities.getPrefs(getActivity()).edit().putInt(QSB_WIDGET_ID, widgetId).apply(); sSavedWidgetId = -1; rebindFragment(); } else if (sSavedWidgetId != -1) { Launcher.getLauncher(getActivity()).getAppWidgetHost().deleteAppWidgetId(sSavedWidgetId); sSavedWidgetId = -1; } } } @Override public void onResume() { super.onResume(); if (mQsb != null && mQsb.isReinflateRequired()) { rebindFragment(); } } @Override public void onDestroy() { getActivity().unregisterReceiver(mRebindReceiver); super.onDestroy(); } private void rebindFragment() { if (mWrapper != null && getActivity() != null) { mWrapper.removeAllViews(); mWrapper.addView(createQsb(getActivity().getLayoutInflater(), mWrapper)); } } private View getDefaultView(LayoutInflater inflater, ViewGroup parent, boolean showSetup) { View v = inflater.inflate(R.layout.qsb_default_view, parent, false); if (showSetup) { View setupButton = v.findViewById(R.id.btn_qsb_setup); setupButton.setVisibility(View.VISIBLE); setupButton.setOnClickListener(this); } v.findViewById(R.id.btn_qsb_search).setOnClickListener(this); return v; } } /** * Returns a widget with category {@link AppWidgetProviderInfo#WIDGET_CATEGORY_SEARCHBOX} * provided by the same package which is set to be global search activity. * If widgetCategory is not supported, or no such widget is found, returns the first widget * provided by the package. */ public static AppWidgetProviderInfo getSearchWidgetProvider(Context context) { SearchManager searchManager = (SearchManager) context.getSystemService(Context.SEARCH_SERVICE); ComponentName searchComponent = searchManager.getGlobalSearchActivity(); if (searchComponent == null) return null; String providerPkg = searchComponent.getPackageName(); AppWidgetProviderInfo defaultWidgetForSearchPackage = null; AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context); for (AppWidgetProviderInfo info : appWidgetManager.getInstalledProviders()) { if (info.provider.getPackageName().equals(providerPkg) && info.configure == null) { if ((info.widgetCategory & AppWidgetProviderInfo.WIDGET_CATEGORY_SEARCHBOX) != 0) { return info; } else if (defaultWidgetForSearchPackage == null) { defaultWidgetForSearchPackage = info; } } } return defaultWidgetForSearchPackage; } }