Java tutorial
/******************************************************************************* * Copyright 2013 Karlsruhe Institute of Technology. This Work has been partially supported by the EIT ICT Labs funded research project Towards a Mobile Cloud (activity CLD 12206). * * 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 edu.teco.context.ui; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.RelativeLayout; import android.widget.Spinner; import edu.teco.context.R; import edu.teco.context.configuration.FrameworkConfiguration; import edu.teco.context.configuration.FrameworkContext; import edu.teco.context.configuration.FrameworkState; public class Tab4Fragment extends Fragment implements OnItemSelectedListener { /** Tag string for debug logs. */ private static final String TAG = "Tab4Fragment"; private IFragmentControlsListener mFragmentControlsListener; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (container == null) { // We have different layouts, and in one of them this // fragment's containing frame doesn't exist. The fragment // may still be created from its saved state, but there is // no reason to try to create its view hierarchy because it // won't be displayed. Note this is not needed -- we could // just run the code below, where we would create and return // the view hierarchy; it would just never be used. return null; } View v = inflater.inflate(R.layout.tab_frag4_layout, container, false); // make a copy of the context labels List<String> contextLabels = new ArrayList<String>(FrameworkConfiguration.getInstance().getContextLabels()); final Spinner spinner = (Spinner) v.findViewById(R.id.spinner_activities_evaluation); // Create an ArrayAdapter using the string array and a default spinner // layout ArrayAdapter<String> adapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_spinner_item, contextLabels); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); // Sets the listener for the spinner to this activity. spinner.setOnItemSelectedListener(this); return v; } @Override public void onAttach(Activity activity) { super.onAttach(activity); if (FrameworkContext.DEBUG) Log.d(TAG, "tab4 attached"); try { mFragmentControlsListener = (IFragmentControlsListener) activity; } catch (ClassCastException e) { if (FrameworkContext.WARN) Log.w(TAG, (activity.toString() + " must implement IFragmentControlsListener")); } } @Override public void onResume() { super.onResume(); if (FrameworkContext.INFO) Log.i(TAG, "Fragment returned and context label is: " + TabsFragmentActivity.getCurrentContextLabel()); int contextLabelIndex = FrameworkConfiguration.getInstance().getContextLabels() .indexOf(TabsFragmentActivity.getCurrentContextLabel()); Spinner spinner = (Spinner) getActivity().findViewById(R.id.spinner_activities_evaluation); spinner.setSelection(contextLabelIndex); Button trainingButton = (Button) getActivity().findViewById(R.id.buttonEvaluating); if (trainingButton != null) { FrameworkState state = ((TabsFragmentActivity) getActivity()).framework.getCurrentState(); if (state == FrameworkState.EVALUATING) { trainingButton.setText(R.string.button_stop_recording); } else { trainingButton.setText(R.string.button_start_recording); } } } public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { if (FrameworkContext.INFO) Log.i(TAG, "New context label selected with position " + position); if (mFragmentControlsListener != null && FrameworkConfiguration.getInstance().getContextLabels().size() > position) { mFragmentControlsListener.onContextLabelSelected(parent, FrameworkConfiguration.getInstance().getContextLabels().get(position)); } } public void onNothingSelected(AdapterView<?> arg0) { // do nothing } }