Java tutorial
/** * Copyright (C) 2011-2017 The PILE Developers <pile-dev@googlegroups.com> * * 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.pileproject.drive.setting.app; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import android.util.DisplayMetrics; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.CheckBox; import android.widget.ListView; import com.pileproject.drive.R; import com.pileproject.drive.database.ProgramDataManager; import com.pileproject.drive.util.fragment.AlertDialogFragment; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; /** * A fragment for showing the list of programs. This fragment will be used by {@link ProgramListPreference}. */ public class ProgramListFragment extends DialogFragment implements AlertDialogFragment.EventListener { private ProgramDataManager mManager; private Button mDeleteButton; // 0 : sample programs, 1 : user programs private static final int SAMPLE_PROGRAM = 0; private static final int USER_PROGRAM = 1; private static final int NUM_PROGRAM_KINDS = 2; private Button[] mProgramsCheckAllButton = new Button[NUM_PROGRAM_KINDS]; private ListView[] mProgramListView = new ListView[NUM_PROGRAM_KINDS]; private ProgramDataAdapter[] mProgramDataAdapter = new ProgramDataAdapter[2]; private ArrayList<Map<String, Boolean>> mCheckedPrograms = new ArrayList<>(); public ProgramListFragment() { // required empty constructor } @Override @NonNull public Dialog onCreateDialog(Bundle savedInstanceState) { Dialog dialog = new Dialog(getActivity()); dialog.setTitle(R.string.setting_programList); return dialog; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); View v = inflater.inflate(R.layout.fragment_program_list, container, false); // create ProgramDataManager to list programs mManager = ProgramDataManager.getInstance(); mCheckedPrograms.add(new LinkedHashMap<String, Boolean>()); mCheckedPrograms.add(new LinkedHashMap<String, Boolean>()); // prepare data for Data adapter initializeProgramDataAdapter(); // create ListView to show all programs // an item in ListView consists of (checkbox, program name) [CustomView] mProgramListView[0] = (ListView) v.findViewById(R.id.programList_sampleProgramListView); mProgramListView[1] = (ListView) v.findViewById(R.id.programList_userProgramListView); // create "delete" Button // by clicking it, checked items (programs) will be deleted mDeleteButton = (Button) v.findViewById(R.id.programList_deleteButton); // create "check all" Button for good user experience mProgramsCheckAllButton[0] = (Button) v.findViewById(R.id.programList_samplePrograms_checkAllButton); mProgramsCheckAllButton[1] = (Button) v.findViewById(R.id.programList_userPrograms_checkAllButton); return v; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); resizeDialog(); mDeleteButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { new AlertDialogFragment.Builder(ProgramListFragment.this).setTitle(R.string.confirmation) .setMessage(getString(R.string.delete, generateProgramNamesToBeDeleted())) .setPositiveButtonLabel(android.R.string.ok).setNegativeButtonLabel(android.R.string.cancel) .show(); } }); for (int i = 0; i < NUM_PROGRAM_KINDS; i++) { final int dataId = i; mProgramsCheckAllButton[dataId].setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { checkAllItems(dataId); } }); mProgramListView[dataId].setAdapter(mProgramDataAdapter[dataId]); mProgramListView[dataId].setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { ProgramData data = mProgramDataAdapter[dataId].getItem(position); CheckBox chk = (CheckBox) view.findViewById(R.id.programList_checkBox); chk.setChecked(!chk.isChecked()); // toggle check // update state mCheckedPrograms.get(dataId).put(data.getProgramName(), chk.isChecked()); } }); } } /** * This function should be called in {@link DialogFragment#onActivityCreated(Bundle)}. * Otherwise, the dialog size will never be changed. */ private void resizeDialog() { Dialog dialog = getDialog(); DisplayMetrics metrics = getResources().getDisplayMetrics(); // resize window large enough to display list views int dialogWidth = (int) (metrics.widthPixels * 0.8); int dialogHeight = (int) (metrics.heightPixels * 0.6); WindowManager.LayoutParams lp = dialog.getWindow().getAttributes(); lp.width = dialogWidth; lp.height = dialogHeight; dialog.getWindow().setAttributes(lp); } private void initializeProgramDataAdapter() { for (int dataId = 0; dataId < NUM_PROGRAM_KINDS; dataId++) { mCheckedPrograms.get(dataId).clear(); // items are categorized into 2 parts; samples and user programs. ArrayList<String> programNames = (dataId == SAMPLE_PROGRAM) ? mManager.loadSampleProgramNames() : mManager.loadUserProgramNames(); // create an adapter for ListView List<ProgramData> data = new ArrayList<>(); for (String programName : programNames) { ProgramData one = new ProgramData(); one.setProgramName(programName); data.add(one); // initialize checked program list // put (program name, false) mCheckedPrograms.get(dataId).put(programName, false); } mProgramDataAdapter[dataId] = new ProgramDataAdapter(getActivity(), 0, data); } } private void checkAllItems(int dataId) { ListView lv = mProgramListView[dataId]; Map<String, Boolean> m = mCheckedPrograms.get(dataId); ProgramDataAdapter pda = mProgramDataAdapter[dataId]; for (int i = 0; i < lv.getChildCount(); i++) { View view = lv.getChildAt(i); CheckBox chk = (CheckBox) view.findViewById(R.id.programList_checkBox); chk.setChecked(true); m.put(chk.getText().toString(), true); } pda.notifyDataSetChanged(); } private String generateProgramNamesToBeDeleted() { String separator = ", "; StringBuilder sb = new StringBuilder(); for (int dataId = 0; dataId < NUM_PROGRAM_KINDS; dataId++) { for (Map.Entry<String, Boolean> e : mCheckedPrograms.get(dataId).entrySet()) { if (!e.getValue()) { continue; // won't be deleted } // not initial addition if (sb.length() > 0) { sb.append(separator); } sb.append(e.getKey()); } } return sb.toString(); } private void deletePrograms() { for (int dataId = 0; dataId < NUM_PROGRAM_KINDS; ++dataId) { for (Map.Entry<String, Boolean> e : mCheckedPrograms.get(dataId).entrySet()) { if (e.getValue()) { if (dataId == SAMPLE_PROGRAM) { // sample programs mManager.deleteSampleProgram(e.getKey()); } else /* if (dataId == USER_PROGRAM) */ { // user programs mManager.deleteUserProgram(e.getKey()); } } } } initializeProgramDataAdapter(); // reinitialize data for (int dataId = 0; dataId < NUM_PROGRAM_KINDS; dataId++) { mProgramListView[dataId].setAdapter(mProgramDataAdapter[dataId]); mProgramDataAdapter[dataId].notifyDataSetChanged(); } } @Override public void onDialogEventHandled(int requestCode, DialogInterface dialog, int which, Bundle params) { if (which == DialogInterface.BUTTON_POSITIVE) { deletePrograms(); } } @Override public void onDialogEventCancelled(int requestCode, DialogInterface dialog, Bundle params) { } }