Java tutorial
/* Copyright 2010-2013 Daniel Bjorge 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.audacity.booster.fragments; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.ListFragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.audacity.booster.R; import com.audacity.booster.utils.Detector.AdSource; import com.audacity.booster.utils.Detector.AdSourcesInfo; import com.audacity.booster.utils.NativeDetectionDialogFragment; /** * This fragment controls the main view of the application. It directly manages the details of displaying * the list of found apps and contains all the control buttons, but it delegates to a DetectorTaskFragment * for actually performing the detection work. This separation is mostly so that the DetectorTaskFragment * can persist through an orientation change without stopping the main UI from being able to re-render. */ public class DetectorFragment extends ListFragment implements DetectorTaskFragment.Callbacks, NativeDetectionDialogFragment.Callbacks, OnClickListener { // //////////////////////////////////////////////////////////////////////// // Lifecycle // //////////////////////////////////////////////////////////////////////// @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // If there already exists fragments doing work, reattach to them FragmentManager fm = getFragmentManager(); DetectorTaskFragment taskFragment = (DetectorTaskFragment) fm.findFragmentByTag(DetectorTaskFragment.TAG); if (taskFragment != null) { taskFragment.setTargetFragment(this, DetectorTaskFragment.TASK_REQUEST_CODE); } Fragment dialogFragment = fm.findFragmentByTag(NativeDetectionDialogFragment.TAG); if (dialogFragment != null) { dialogFragment.setTargetFragment(this, NativeDetectionDialogFragment.TASK_REQUEST_CODE); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View fragmentView = inflater.inflate(R.layout.detector_fragment, container, false); Button refreshButton = (Button) fragmentView.findViewById(R.id.refresh_button); refreshButton.setOnClickListener(this); return fragmentView; } // //////////////////////////////////////////////////////////////////////// // Control logic // //////////////////////////////////////////////////////////////////////// AdSourcesInfo mAdSources; @Override public void onListItemClick(ListView listView, View view, int position, long id) { // Uninstall the app PackageInfo pkg = mAdSources.adSources.get(position).packageInfo; Intent i = new Intent(Intent.ACTION_DELETE); i.setData(Uri.parse("package:" + pkg.packageName)); startActivity(i); } @Override public void onClick(View v) { // Only thing this responds to is the scan/refresh button refresh(false); } // Callback from DetectorTaskFragment @Override public void onTaskCancelled() { Log.d("DetectorFragment", "Task was cancelled"); populate(null); } // Callback from DetectorTaskFragment @Override public void onTaskFinished(AdSourcesInfo adSources) { Log.d("DetectorFragment", "Task finished (" + adSources.adSources.size() + " results)"); populate(adSources); } // Callback from NativeDetectionDialogFragment @Override public void onSelection(boolean doDetection) { Log.d("DetectorFragment", "NativeDetectionDialogFragment returned that we " + (doDetection ? "should" : "should not") + " detect."); if (doDetection) { refresh(true); } } private void refresh(boolean force) { if (!force && supportsNativeDetection()) { showNativeDetectionInfo(); // We don't start a detector task here - if the user wants one after being told // about the native path, this will be reinvoked with force=true by onSelection } else { startDetectionTask(); } } /** * I think this native detection exists anytime the OS version is >= 4.1, but it's possible there are terrible * manufacturers who have disabled it that I don't know about... * * @return Whether this device is capable of natively describing a notification's source by long-pressing it */ private boolean supportsNativeDetection() { return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN; } private void showNativeDetectionInfo() { NativeDetectionDialogFragment dialog = new NativeDetectionDialogFragment(); dialog.setTargetFragment(this, NativeDetectionDialogFragment.TASK_REQUEST_CODE); dialog.show(getFragmentManager(), NativeDetectionDialogFragment.TAG); } private void startDetectionTask() { DetectorTaskFragment taskFragment = new DetectorTaskFragment(); taskFragment.setTargetFragment(this, DetectorTaskFragment.TASK_REQUEST_CODE); taskFragment.show(getFragmentManager(), DetectorTaskFragment.TAG); } private void populate(AdSourcesInfo adSources) { if (adSources == null) { mAdSources = new AdSourcesInfo(); this.setListAdapter(null); } else { mAdSources = adSources; this.setListAdapter( new AdSourceArrayAdapter(getActivity(), adSources.adSources.toArray(new AdSource[0]))); if (adSources.adSources.isEmpty()) { Toast.makeText(getActivity(), "Congratulations! No virus found!", Toast.LENGTH_SHORT).show(); } } } // //////////////////////////////////////////////////////////////////////// // List display // //////////////////////////////////////////////////////////////////////// private class AdSourceArrayAdapter extends ArrayAdapter<AdSource> { private class ViewHolder { public TextView appName; public ImageView appIcon; public TextView adProviderName; } private final LayoutInflater inflater; private final PackageManager pm; private final AdSource[] values; public AdSourceArrayAdapter(Activity ctx, AdSource[] values) { super(ctx, R.layout.list_item, values); this.inflater = ctx.getLayoutInflater(); this.pm = ctx.getPackageManager(); this.values = values; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { convertView = inflater.inflate(R.layout.list_item, null); holder = new ViewHolder(); holder.appName = (TextView) convertView.findViewById(R.id.app_name); holder.appIcon = (ImageView) convertView.findViewById(R.id.app_icon); holder.adProviderName = (TextView) convertView.findViewById(R.id.ad_provider_name); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } AdSource src = values[position]; PackageInfo pkg = src.packageInfo; holder.appName.setText(pm.getApplicationLabel(pkg.applicationInfo).toString()); holder.adProviderName.setText(getResources().getString(R.string.list_item_ad_framework_prefix) + ": " + src.adProvider.friendlyName); holder.appIcon.setImageDrawable(pkg.applicationInfo.loadIcon(pm)); return convertView; } } }