Java tutorial
/* * Copyright (C) 2012 Daryl Daly * * This file is part of Heart Observe * * Heart Observe is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Heart Observe is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package ca.ddaly.android.heart; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import android.os.Build; import android.os.Bundle; import android.os.StrictMode; import android.widget.TextView; import android.widget.Toast; import android.content.Intent; import android.view.View; import android.util.Log; import android.net.Uri; import android.content.ActivityNotFoundException; import android.content.ContentResolver; import java.util.ArrayList; import android.support.v4.app.FragmentTransaction; /** * Main application activity */ public class Heart extends SherlockFragmentActivity implements ListFragment.ListSelectListener, DatabaseHelper.RecordChangedListener { private static final String TAG = "Heart"; static final int REC_REQUEST = 5001; private static final String DATA_FRAG = "Data Fragment"; private EditFragment myViewer; private ListFragment myList; private Long switchToRecID = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /* if (BuildConfig.DEBUG && Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) { StrictMode.setThreadPolicy(buildPolicy()); } */ myViewer = (EditFragment) getSupportFragmentManager().findFragmentById(R.id.editfrag_container); if (myViewer == null) { if (BuildConfig.DEBUG) { Log.v(TAG, "onCreate: setting up new edit fragment"); } myViewer = new EditFragment(); getSupportFragmentManager().beginTransaction().add(R.id.editfrag_container, myViewer).commit(); } else { if (BuildConfig.DEBUG) { Log.v(TAG, "onCreate: edit fragment still exists"); } } myList = (ListFragment) getSupportFragmentManager().findFragmentById(R.id.reclist); if (myList == null && findViewById(R.id.reclist) != null) { if (BuildConfig.DEBUG) { Log.v(TAG, "onCreate: setting up new list fragment"); } myList = new ListFragment(); getSupportFragmentManager().beginTransaction().add(R.id.reclist, myList).commit(); } else { if (BuildConfig.DEBUG) { Log.v(TAG, "onCreate: list fragment not created"); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { new MenuInflater(this).inflate(R.menu.options, menu); return (super.onCreateOptionsMenu(menu)); } @Override public boolean onOptionsItemSelected(MenuItem item) { Intent i = null; switch (item.getItemId()) { case android.R.id.home: return (true); case R.id.list: i = new Intent(this, ListActivity.class); myViewer.doSave(); // ensure current record is updated to db so list can show it startActivityForResult(i, REC_REQUEST); return (true); case R.id.about: i = new Intent(this, SimpleContentActivity.class); i.putExtra(SimpleContentActivity.EXTRA_FILE, "file:///android_asset/misc/about.html"); startActivity(i); return (true); case R.id.help: i = new Intent(this, SimpleContentActivity.class); i.putExtra(SimpleContentActivity.EXTRA_FILE, "file:///android_asset/misc/help.html"); startActivity(i); return (true); case R.id.graph: myViewer.doSave(); // ensure current record is updated to db so it can be graphed doGraph(); return (true); case R.id.add: if (myList != null) { myList.unselectCurr(); } RecordSelect(0L); return (true); } return (super.onOptionsItemSelected(item)); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REC_REQUEST && resultCode == SherlockFragmentActivity.RESULT_OK) { if (BuildConfig.DEBUG) { Log.v(TAG, "got activity result: " + data.getExtras().get("ca.ddaly.android.heart.REC_ID")); } Long newRecID = data.getLongExtra("ca.ddaly.android.heart.REC_ID", 0); if (myList != null) { // list fragment exists // update the edit fragment switchNewEditFrag(newRecID); } else { // postpone the edit fragment switch until this activity has been restarted switchToRecID = newRecID; } } } @Override protected void onStart() { if (BuildConfig.DEBUG) { Log.v(TAG, "onStart"); } super.onStart(); if (myList != null) { // list fragment exists DatabaseHelper.getInstance(this).addRecordChangedListener(this); // need to keep list updated with record changes } else { // check if need to bring up a particular record id if (switchToRecID != null) { // do previously postponed edit fragment switch switchNewEditFrag(switchToRecID); switchToRecID = null; } } } @Override protected void onStop() { if (BuildConfig.DEBUG) { Log.v(TAG, "onStop"); } super.onStop(); if (myList != null) { // list fragment exists DatabaseHelper.getInstance(this).removeRecordChangedListener(this); } } private void doGraph() { TimePressureGraph graph = TimePressureGraph.getInstance(this); Intent i = graph.getIntent(); if (i != null) { startActivity(graph.getIntent()); } else { Toast.makeText(this.getApplicationContext(), this.getApplicationContext().getString(R.string.no_graph_data), Toast.LENGTH_LONG).show(); } } /** * receiver for a record selected event from ListFragment * - also handles an Add user request (with id of 0) */ public void RecordSelect(long id) { if (BuildConfig.DEBUG) { Log.v(TAG, "RecordSelect: new EditFragment id = " + id); } switchNewEditFrag(id); } /** * switch to new edit fragment for display/edit of a new record */ private void switchNewEditFrag(long id) { Bundle args = new Bundle(); args.putLong("id", id); myViewer = new EditFragment(); myViewer.setArguments(args); /* .setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out, android.R.anim.fade_in, android.R.anim.fade_out) .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) */ getSupportFragmentManager().beginTransaction().setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) .replace(R.id.editfrag_container, myViewer).commit(); } /** * receiver of record changed event from DatabaseHelper */ public void recordChanged(Long id) { // a record (id) has changed (could be value(s) changed or could be deleted) // for now just refresh the list (if there is one) // TODO -- might be better if could just update the given record if (BuildConfig.DEBUG) { Log.v(TAG, "recordChanged: id = " + id); } if (myList != null) { myList.updateList(); } } private StrictMode.ThreadPolicy buildPolicy() { if (BuildConfig.DEBUG) { Log.v(TAG, "Setting strict mode"); } return (new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog().build()); } }