Java tutorial
/** * Copyright 2010-present Facebook. * * 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.facebook.android; import android.app.Dialog; import android.os.Bundle; import android.text.SpannableString; import android.text.style.UnderlineSpan; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.*; import android.widget.AdapterView.OnItemClickListener; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.TabHost.TabSpec; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Vector; public class FieldsConnectionsDialog extends Dialog { private final static int TAB_HEIGHT = 50; private Button mGetFieldsButton; private ListView fieldsList, connectionsList; private BaseAdapter fieldsAdapter, connectionsAdapter; private GraphExplorer explorerActivity; protected Vector<String> fieldsVector; private ArrayList<JSONObject> fieldsArray; private ArrayList<String> connectionsArray; public FieldsConnectionsDialog(GraphExplorer explorerActivity, JSONObject metadata) { super(explorerActivity); this.explorerActivity = explorerActivity; /* * Sort the fields and connections */ try { sortFields(metadata.getJSONArray("fields")); sortConnections(metadata.getJSONObject("connections").names()); } catch (JSONException e) { Toast.makeText(explorerActivity.getBaseContext(), "Fields/Connections could not be fetched.", Toast.LENGTH_SHORT).show(); } setTitle(explorerActivity.getString(R.string.fields_and_connections)); fieldsVector = new Vector<String>(); } /* * Sort fields which are returned as JSONObject in the JSONArray */ public void sortFields(JSONArray jsonFieldsArray) { this.fieldsArray = new ArrayList<JSONObject>(jsonFieldsArray.length()); for (int i = 0; i < jsonFieldsArray.length(); i++) { try { this.fieldsArray.add(jsonFieldsArray.getJSONObject(i)); } catch (JSONException e) { e.printStackTrace(); } } Collections.sort(this.fieldsArray, new Comparator<JSONObject>() { @Override public int compare(JSONObject object1, JSONObject object2) { try { return object1.getString("name").compareToIgnoreCase(object2.getString("name")); } catch (JSONException e) { e.printStackTrace(); } return 0; } }); } /* * Sort the Connections returned in the JSONArray */ public void sortConnections(JSONArray jsonConnectionsArray) { this.connectionsArray = new ArrayList<String>(jsonConnectionsArray.length()); for (int i = 0; i < jsonConnectionsArray.length(); i++) { try { this.connectionsArray.add(jsonConnectionsArray.get(i).toString()); } catch (JSONException e) { e.printStackTrace(); } } Collections.sort(this.connectionsArray); } /* * Layout the dialog */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fields_connections_list); LayoutParams params = getWindow().getAttributes(); params.width = LayoutParams.FILL_PARENT; params.height = LayoutParams.FILL_PARENT; getWindow().setAttributes((android.view.WindowManager.LayoutParams) params); fieldsList = (ListView) findViewById(R.id.fields_list); connectionsList = (ListView) findViewById(R.id.connections_list); fieldsAdapter = new FieldsListAdapter(); if (this.fieldsArray == null) { fieldsList.setAdapter(new ArrayAdapter<String>(explorerActivity, android.R.layout.simple_list_item_1, new String[] { "No fields available" })); } else { fieldsList.setAdapter(fieldsAdapter); } connectionsAdapter = new ConnectionsListAdapter(); if (this.connectionsArray == null) { connectionsList.setAdapter(new ArrayAdapter<String>(explorerActivity, android.R.layout.simple_list_item_1, new String[] { "No connections available" })); } else { connectionsList.setAdapter(connectionsAdapter); } TabHost tabHost = (TabHost) findViewById(R.id.tabHost); tabHost.setup(); TabSpec spec1 = tabHost.newTabSpec("Tab 1"); spec1.setIndicator(explorerActivity.getString(R.string.fields)); spec1.setContent(R.id.fields_layout); TabSpec spec2 = tabHost.newTabSpec("Tab 2"); spec2.setIndicator(explorerActivity.getString(R.string.connections)); spec2.setContent(R.id.connections_list); tabHost.addTab(spec1); tabHost.addTab(spec2); tabHost.setCurrentTab(0); tabHost.getTabWidget().getChildAt(0).getLayoutParams().height = TAB_HEIGHT; tabHost.getTabWidget().getChildAt(1).getLayoutParams().height = TAB_HEIGHT; mGetFieldsButton = (Button) findViewById(R.id.get_fields_button); mGetFieldsButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { /* * Source Tag: */ FieldsConnectionsDialog.this.dismiss(); if (!fieldsVector.isEmpty()) { explorerActivity.getFields(fieldsVector); } else { Toast.makeText(explorerActivity.getBaseContext(), "No Fields selected.", Toast.LENGTH_SHORT) .show(); } } }); connectionsList.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) { FieldsConnectionsDialog.this.dismiss(); explorerActivity.getConnection(connectionsArray.get(position)); } }); } /** * Definition of the list adapter */ public class FieldsListAdapter extends BaseAdapter { private LayoutInflater mInflater; boolean[] isChecked; public FieldsListAdapter() { mInflater = LayoutInflater.from(explorerActivity.getBaseContext()); isChecked = new boolean[fieldsArray.size()]; } @Override public int getCount() { return fieldsArray.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(final int position, View convertView, ViewGroup parent) { View hView = convertView; ViewHolder holder; JSONObject fieldObject = null; fieldObject = fieldsArray.get(position); if (hView == null) { hView = mInflater.inflate(R.layout.fields_item, null); holder = new ViewHolder(); holder.checkbox = (CheckBox) hView.findViewById(R.id.fields_checkbox); holder.fieldsInfo = (TextView) hView.findViewById(R.id.fields_info); hView.setTag(holder); } else { holder = (ViewHolder) hView.getTag(); } try { holder.checkbox.setText(fieldObject.getString("name")); } catch (JSONException e) { holder.checkbox.setText(""); } try { holder.fieldsInfo.setText(fieldObject.getString("description")); } catch (JSONException e) { holder.fieldsInfo.setText(""); } holder.checkbox.setId(position); holder.checkbox.setChecked(isChecked[position]); holder.checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton button, boolean checked) { isChecked[button.getId()] = checked; String field = button.getText().toString(); if (checked) { fieldsVector.add(field); } else if (fieldsVector.contains(field)) { fieldsVector.remove(field); } } }); return hView; } } class ViewHolder { CheckBox checkbox; TextView fieldsInfo; } /** * Definition of the list adapter */ public class ConnectionsListAdapter extends BaseAdapter { private LayoutInflater mInflater; public ConnectionsListAdapter() { mInflater = LayoutInflater.from(explorerActivity.getBaseContext()); } @Override public int getCount() { return connectionsArray.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { View hView = convertView; TextView connection; if (hView == null) { hView = mInflater.inflate(R.layout.connection_item, null); connection = (TextView) hView.findViewById(R.id.connection_name); hView.setTag(connection); } else { connection = (TextView) hView.getTag(); } SpannableString name; name = new SpannableString(connectionsArray.get(position)); name.setSpan(new UnderlineSpan(), 0, name.length(), 0); connection.setText(name); return hView; } } }