Java tutorial
/* * This file is part of nori. * Copyright (c) 2014 vomitcuddle <shinku@dollbooru.org> * License: ISC */ package com.cuddlesoft.nori; import android.app.ProgressDialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.util.Pair; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.ImageButton; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.cuddlesoft.nori.database.APISettingsDatabase; import com.cuddlesoft.nori.fragment.EditAPISettingDialogFragment; import com.cuddlesoft.norilib.clients.SearchClient; import com.cuddlesoft.norilib.service.ServiceTypeDetectionService; import java.util.List; /** Adds, edits or removes API settings from {@link com.cuddlesoft.nori.database.APISettingsDatabase}. */ public class APISettingsActivity extends ActionBarActivity implements EditAPISettingDialogFragment.Listener { /** A new row will be inserted into the database when this row ID value is passed to {@link #editService(long, String, String, String, String)}. */ private static final long ROW_ID_INSERT = -1L; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Inflate layout XML. setContentView(R.layout.activity_service_settings); // Hide the app icon and use the activity title as the home button. ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayShowHomeEnabled(false); actionBar.setDisplayShowTitleEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); // Set up the ListView adapter and OnItemClickListener. ListView listView = (ListView) findViewById(android.R.id.list); ListAdapter listAdapter = new ListAdapter(); listView.setOnItemClickListener(listAdapter); listView.setAdapter(listAdapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate menu XML. getMenuInflater().inflate(R.menu.api_settings, menu); return true; } /** * Remove setting from the {@link com.cuddlesoft.nori.database.APISettingsDatabase}. * * @param id Database row ID. */ private void removeSetting(final long id) { // Remove setting from database on a background thread. // This is so database I/O doesn't block the UI thread. new Thread(new Runnable() { @Override public void run() { new APISettingsDatabase(APISettingsActivity.this).delete(id); } }).run(); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar button clicks. switch (item.getItemId()) { case android.R.id.home: // Make pressing the action bar "up" button perform same action as pressing the physical "back" button. onBackPressed(); return true; case R.id.action_add: // Show dialog to let user add a new service. new EditAPISettingDialogFragment().show(getSupportFragmentManager(), "EditAPISettingDialogFragment"); return true; default: // Perform default action. return super.onOptionsItemSelected(item); } } @Override public void addService(String name, String url, String username, String passphrase) { editService(ROW_ID_INSERT, name, url, username, passphrase); } @Override public void editService(final long rowId, final String name, final String url, final String username, final String passphrase) { // Show progress dialog during the service type detection process. final ProgressDialog dialog = new ProgressDialog(this); dialog.setIndeterminate(true); dialog.setCancelable(false); dialog.setMessage(getString(R.string.dialog_message_detectingApiType)); dialog.show(); // Register broadcast receiver to get results from the background service type detection service. registerReceiver(new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // Get result code from received intent. int resultCode = intent.getIntExtra(ServiceTypeDetectionService.RESULT_CODE, -1); if (resultCode == ServiceTypeDetectionService.RESULT_OK) { // Add a new service to the database on a background thread. // This is so database I/O doesn't block the UI thread. SearchClient.Settings.APIType apiType = SearchClient.Settings.APIType.values()[intent .getIntExtra(ServiceTypeDetectionService.API_TYPE, 0)]; final SearchClient.Settings settings = new SearchClient.Settings(apiType, name, url, username, passphrase); new Thread(new Runnable() { @Override public void run() { APISettingsDatabase database = new APISettingsDatabase(APISettingsActivity.this); if (rowId == ROW_ID_INSERT) { database.insert(settings); } else { database.update(rowId, settings); } database.close(); } }).run(); } else if (resultCode == ServiceTypeDetectionService.RESULT_FAIL_INVALID_URL) { Toast.makeText(APISettingsActivity.this, R.string.toast_error_serviceUriInvalid, Toast.LENGTH_LONG).show(); } else if (resultCode == ServiceTypeDetectionService.RESULT_FAIL_NETWORK) { Toast.makeText(APISettingsActivity.this, R.string.toast_error_noNetwork, Toast.LENGTH_LONG) .show(); } else if (resultCode == ServiceTypeDetectionService.RESULT_FAIL_NO_API) { Toast.makeText(APISettingsActivity.this, R.string.toast_error_noServiceAtGivenUri, Toast.LENGTH_LONG).show(); } // Unregister the broadcast receiver. unregisterReceiver(this); // Dismiss progress dialog. dialog.dismiss(); } }, new IntentFilter(ServiceTypeDetectionService.ACTION_DONE)); // Start the background service type detection service. Intent serviceIntent = new Intent(this, ServiceTypeDetectionService.class); serviceIntent.putExtra(ServiceTypeDetectionService.ENDPOINT_URL, url); startService(serviceIntent); } /** Populates the {@link android.widget.ListView} with data from {@link com.cuddlesoft.nori.database.APISettingsDatabase}. */ private class ListAdapter extends BaseAdapter implements LoaderManager.LoaderCallbacks<List<Pair<Integer, SearchClient.Settings>>>, AdapterView.OnItemClickListener { /** {@link com.cuddlesoft.nori.database.APISettingsDatabase} loader ID. */ private static final int LOADER_ID_DATABASE_LOADER = 0x00; /** List of {@link android.util.Pair}s mapping database row IDs to {@link com.cuddlesoft.norilib.clients.SearchClient.Settings} objects. */ private List<Pair<Integer, SearchClient.Settings>> settingsList; public ListAdapter() { // Initialize the asynchronous database loader. getSupportLoaderManager().initLoader(LOADER_ID_DATABASE_LOADER, null, this); } @Override public int getCount() { if (settingsList != null) { return settingsList.size(); } return 0; } @Override public SearchClient.Settings getItem(int position) { return settingsList.get(position).second; } @Override public long getItemId(int position) { return settingsList.get(position).first; } @Override public View getView(int position, View recycledView, ViewGroup container) { // Recycle the view, if possible. View view = recycledView; if (view == null) { // Create a new instance of the view. view = LayoutInflater.from(APISettingsActivity.this).inflate(R.layout.listitem_service_setting, container, false); } // Get data from the List for current position. SearchClient.Settings settings = getItem(position); final long id = getItemId(position); // Populate views with content. TextView title = (TextView) view.findViewById(R.id.title); title.setText(settings.getName()); TextView summary = (TextView) view.findViewById(R.id.summary); summary.setText(settings.getEndpoint()); // Attach onClickListener to the remove button and hook it up to the #removeSetting method. ImageButton actionRemove = (ImageButton) view.findViewById(R.id.action_remove); actionRemove.setFocusable(false); actionRemove.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { removeSetting(id); } }); return view; } @Override public Loader<List<Pair<Integer, SearchClient.Settings>>> onCreateLoader(int id, Bundle args) { if (id == LOADER_ID_DATABASE_LOADER) { // Initialize the database loader. return new APISettingsDatabase.Loader(APISettingsActivity.this); } return null; } @Override public void onLoadFinished(Loader<List<Pair<Integer, SearchClient.Settings>>> loader, List<Pair<Integer, SearchClient.Settings>> data) { settingsList = data; notifyDataSetChanged(); } @Override public void onLoaderReset(Loader<List<Pair<Integer, SearchClient.Settings>>> loader) { settingsList = null; notifyDataSetInvalidated(); } @Override public void onItemClick(AdapterView<?> listView, View view, int position, long itemId) { // Show dialog to edit the service settings object. EditAPISettingDialogFragment.newInstance(itemId, getItem(position)).show(getSupportFragmentManager(), "EditAPISettingDialogFragment"); } } }