Java tutorial
/* * Copyright 2013 Google Inc. * * 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.ctrlplusz.dashclock.yr.configuration; import com.ctrlplusz.dashclock.yr.R; import com.ctrlplusz.dashclock.yr.ui.SimplePagedTabsHelper; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.DialogFragment; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.preference.Preference; import android.support.v4.view.ViewPager; import android.text.TextUtils; import android.util.AttributeSet; import android.util.TypedValue; import android.view.ContextThemeWrapper; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; /** * A preference that allows the user to choose an application or shortcut. */ public class AppChooserPreference extends Preference { private boolean mAllowUseDefault = false; public AppChooserPreference(Context context, AttributeSet attrs) { super(context, attrs); initAttrs(attrs, 0); } public AppChooserPreference(Context context) { super(context); initAttrs(null, 0); } public AppChooserPreference(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initAttrs(attrs, defStyle); } private void initAttrs(AttributeSet attrs, int defStyle) { TypedArray a = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.AppChooserPreference, defStyle, defStyle); try { mAllowUseDefault = a.getBoolean(R.styleable.AppChooserPreference_allowUseDefault, true); } finally { a.recycle(); } } public void setIntentValue(Intent intent) { setValue(intent == null ? "" : intent.toUri(Intent.URI_INTENT_SCHEME)); } public void setValue(String value) { if (callChangeListener(value)) { persistString(value); notifyChanged(); } } public static Intent getIntentValue(String value, Intent defaultIntent) { try { if (TextUtils.isEmpty(value)) { return defaultIntent; } return Intent.parseUri(value, Intent.URI_INTENT_SCHEME); } catch (URISyntaxException e) { return defaultIntent; } } public static CharSequence getDisplayValue(Context context, String value) { if (TextUtils.isEmpty(value)) { return context.getString(R.string.pref_yr_shortcut_default); } Intent intent; try { intent = Intent.parseUri(value, Intent.URI_INTENT_SCHEME); } catch (URISyntaxException e) { return context.getString(R.string.pref_yr_shortcut_default); } PackageManager pm = context.getPackageManager(); List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, 0); if (resolveInfos.size() == 0) { return null; } StringBuilder label = new StringBuilder(); label.append(resolveInfos.get(0).loadLabel(pm)); if (intent.getData() != null && intent.getData().getScheme() != null && intent.getData().getScheme().startsWith("http")) { label.append(": ").append(intent.getDataString()); } return label; } @Override protected void onClick() { super.onClick(); AppChooserDialogFragment fragment = AppChooserDialogFragment.newInstance(); fragment.setPreference(this); Activity activity = (Activity) getContext(); activity.getFragmentManager().beginTransaction().add(fragment, getFragmentTag()).commit(); } @Override protected void onAttachedToActivity() { super.onAttachedToActivity(); Activity activity = (Activity) getContext(); AppChooserDialogFragment fragment = (AppChooserDialogFragment) activity.getFragmentManager() .findFragmentByTag(getFragmentTag()); if (fragment != null) { // re-bind preference to fragment fragment.setPreference(this); } } @Override protected Object onGetDefaultValue(TypedArray a, int index) { return a.getString(index); } @Override protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { setValue(restoreValue ? getPersistedString("") : (String) defaultValue); } public String getFragmentTag() { return "app_chooser_" + getKey(); } public static class AppChooserDialogFragment extends DialogFragment { public static int REQUEST_CREATE_SHORTCUT = 1; private AppChooserPreference mPreference; public AppChooserDialogFragment() { } public static AppChooserDialogFragment newInstance() { return new AppChooserDialogFragment(); } public void setPreference(AppChooserPreference preference) { mPreference = preference; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { // Force Holo Light since ?android:actionBarXX would use dark action bar Context layoutContext = new ContextThemeWrapper(getActivity(), android.R.style.Theme_Holo_Light); LayoutInflater layoutInflater = LayoutInflater.from(layoutContext); View rootView = layoutInflater.inflate(R.layout.dialog_app_chooser, null); final ViewGroup tabWidget = (ViewGroup) rootView.findViewById(android.R.id.tabs); final ViewPager pager = (ViewPager) rootView.findViewById(R.id.pager); pager.setPageMargin((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, getResources().getDisplayMetrics())); SimplePagedTabsHelper helper = new SimplePagedTabsHelper(layoutContext, tabWidget, pager); helper.addTab(R.string.title_apps, R.id.apps_list); helper.addTab(R.string.title_shortcuts, R.id.shortcuts_list); // Set up apps final ActivityListAdapter appsAdapter = new ActivityListAdapter( new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER), mPreference.mAllowUseDefault); ListView appsList = (ListView) rootView.findViewById(R.id.apps_list); appsList.setAdapter(appsAdapter); appsList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> listView, View view, int position, long itemId) { Intent intent = appsAdapter.getIntent(position); if (intent != null) { intent = Intent.makeMainActivity(intent.getComponent()); } mPreference.setIntentValue(intent); dismiss(); } }); // Set up shortcuts final ActivityListAdapter shortcutsAdapter = new ActivityListAdapter( new Intent(Intent.ACTION_CREATE_SHORTCUT).addCategory(Intent.CATEGORY_DEFAULT), false); ListView shortcutsList = (ListView) rootView.findViewById(R.id.shortcuts_list); shortcutsList.setAdapter(shortcutsAdapter); shortcutsList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> listView, View view, int position, long itemId) { startActivityForResult(shortcutsAdapter.getIntent(position), REQUEST_CREATE_SHORTCUT); } }); return new AlertDialog.Builder(getActivity()).setView(rootView).create(); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == REQUEST_CREATE_SHORTCUT && resultCode == Activity.RESULT_OK) { mPreference.setIntentValue((Intent) data.getParcelableExtra(Intent.EXTRA_SHORTCUT_INTENT)); dismiss(); } } static class ActivityInfo { CharSequence label; Drawable icon; ComponentName componentName; } private class ActivityListAdapter extends BaseAdapter { private Intent mQueryIntent; private PackageManager mPackageManager; private List<ActivityInfo> mInfos; private boolean mAllowUseDefault; private ActivityListAdapter(Intent queryIntent, boolean allowUseDefault) { mQueryIntent = queryIntent; mPackageManager = getActivity().getPackageManager(); mAllowUseDefault = allowUseDefault; mInfos = new ArrayList<ActivityInfo>(); List<ResolveInfo> resolveInfos = mPackageManager.queryIntentActivities(queryIntent, 0); for (ResolveInfo ri : resolveInfos) { ActivityInfo ai = new ActivityInfo(); ai.icon = ri.loadIcon(mPackageManager); ai.label = ri.loadLabel(mPackageManager); ai.componentName = new ComponentName(ri.activityInfo.packageName, ri.activityInfo.name); mInfos.add(ai); } Collections.sort(mInfos, new Comparator<ActivityInfo>() { @Override public int compare(ActivityInfo activityInfo, ActivityInfo activityInfo2) { return activityInfo.label.toString().compareTo(activityInfo2.label.toString()); } }); } @Override public int getCount() { return mInfos.size() + (mAllowUseDefault ? 1 : 0); } @Override public Object getItem(int position) { if (mAllowUseDefault && position == 0) { return null; } return mInfos.get(position - (mAllowUseDefault ? 1 : 0)); } public Intent getIntent(int position) { if (mAllowUseDefault && position == 0) { return null; } return new Intent(mQueryIntent) .setComponent(mInfos.get(position - (mAllowUseDefault ? 1 : 0)).componentName); } @Override public long getItemId(int position) { if (mAllowUseDefault && position == 0) { return -1; } return mInfos.get(position - (mAllowUseDefault ? 1 : 0)).componentName.hashCode(); } @Override public View getView(int position, View convertView, ViewGroup container) { if (convertView == null) { convertView = LayoutInflater.from(getActivity()).inflate(R.layout.list_item_intent, container, false); } if (mAllowUseDefault && position == 0) { ((TextView) convertView.findViewById(android.R.id.text1)) .setText(getString(R.string.pref_yr_shortcut_default)); ((ImageView) convertView.findViewById(android.R.id.icon)).setImageDrawable(null); } else { ActivityInfo ai = mInfos.get(position - (mAllowUseDefault ? 1 : 0)); ((TextView) convertView.findViewById(android.R.id.text1)).setText(ai.label); ((ImageView) convertView.findViewById(android.R.id.icon)).setImageDrawable(ai.icon); } return convertView; } } } }