Android User Interface Development: Beginner's Guide 源代码

/* * To change this template, choose Tools | Templates * && open the template in the editor. */ package com.packtpub.roboticreview; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; import android.app.TabActivity; import android.app.TimePickerDialog; import android.app.DatePickerDialog; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.SeekBar; import android.widget.TabHost; import android.widget.Gallery; import android.widget.TextView; import android.widget.ImageView; import android.widget.DatePicker; import android.widget.TimePicker; import android.widget.AdapterView; import android.widget.TextSwitcher; import android.widget.ViewSwitcher; /** * * @author Jason Morris */ public class ReviewActivity extends TabActivity implements ViewSwitcher.ViewFactory, Runnable, AdapterView.OnItemSelectedListener, SeekBar.OnSeekBarChangeListener, View.OnClickListener, DatePickerDialog.OnDateSetListener, TimePickerDialog.OnTimeSetListener { // the "review" tab fields private final Handler switchCommentHandler = new Handler(); private String[] comments; private int commentIndex = 0; private TextSwitcher switcher; // the "photos" tab fields private ImageView photo; // the "reservation" tab fields private String peopleLabelFormat; private TextView peopleLabel; private SimpleDateFormat dateFormat; private Button date; private SimpleDateFormat timeFormat; private Button time; /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); createTabs(); } private void initReveiwTab() { comments = getResources().getStringArray(R.array.comments); switcher = (TextSwitcher)findViewById(R.id.reviews); switcher.setFactory(this); } private void initGalleryTab() { photo = ((ImageView)findViewById(R.id.photo)); final Gallery photos = ((Gallery)findViewById(R.id.gallery)); photos.setAdapter(new GalleryAdapter()); photos.setOnItemSelectedListener(this); } private void initReservationTab() { peopleLabel = (TextView)findViewById(R.id.people_label); peopleLabelFormat = peopleLabel.getText().toString(); date = (Button)findViewById(R.id.date); dateFormat = new SimpleDateFormat(date.getText().toString()); time = (Button)findViewById(R.id.time); timeFormat = new SimpleDateFormat(time.getText().toString()); final Calendar calendar = Calendar.getInstance(); if(calendar.get(Calendar.HOUR_OF_DAY) >= 16) { calendar.add(Calendar.DATE, 1); } calendar.set(Calendar.HOUR_OF_DAY, 18); calendar.clear(Calendar.MINUTE); calendar.clear(Calendar.SECOND); calendar.clear(Calendar.MILLISECOND); final Date reservationDate = calendar.getTime(); date.setText(dateFormat.format(reservationDate)); time.setText(timeFormat.format(reservationDate)); date.setOnClickListener(this); time.setOnClickListener(this); final SeekBar people = (SeekBar)findViewById(R.id.people); people.setOnSeekBarChangeListener(this); peopleLabel.setText(String.format( peopleLabelFormat, people.getProgress() + 1)); } private TabHost.TabSpec createTabSpec( final TabHost host, final String tag, final int content, final int textString, final int icon) { return host.newTabSpec(tag). setContent(content). setIndicator( getString(textString), getResources().getDrawable(icon)); } private Calendar parseCalendar( final CharSequence text, final SimpleDateFormat format) { try { final Date parsedDate = format.parse(text.toString()); final Calendar calendar = Calendar.getInstance(); calendar.setTime(parsedDate); return calendar; } catch(final ParseException pe) { Log.e("DateParse", "Couldn't parse date: " + text, pe); throw new RuntimeException(pe); } } private void createTabs() { final TabHost tabs = getTabHost(); getLayoutInflater().inflate( R.layout.main, tabs.getTabContentView(), true); tabs.addTab(createTabSpec( tabs, "review", R.id.review, R.string.review, R.drawable.review)); tabs.addTab(createTabSpec( tabs, "photos", R.id.photos, R.string.gallery, R.drawable.photos)); tabs.addTab(createTabSpec( tabs, "reservation", R.id.reservation, R.string.reservation, R.drawable.reservation)); initReveiwTab(); initGalleryTab(); initReservationTab(); } @Override protected void onStart() { super.onStart(); switchCommentHandler.postDelayed(this, 5 * 1000l); } @Override protected void onStop() { super.onStop(); switchCommentHandler.removeCallbacks(this); } public View makeView() { return getLayoutInflater().inflate(R.layout.review_comment, null); } public void run() { try { if(switcher != null) { switcher.setText(comments[commentIndex++]); if(commentIndex >= comments.length) { commentIndex = 0; } } } finally { switchCommentHandler.postDelayed(this, 5 * 1000l); } } public void onItemSelected( final AdapterView<?> parent, final View view, final int index, final long id) { photo.setImageResource((int)id); } public void onNothingSelected(final AdapterView<?> view) { // ignore this } public void onProgressChanged( final SeekBar bar, final int progress, final boolean fromUser) { peopleLabel.setText(String.format(peopleLabelFormat, progress + 1)); } public void onStartTrackingTouch(final SeekBar bar) { } public void onStopTrackingTouch(final SeekBar bar) { } public void onClick(final View view) { if(view == date) { final Calendar calendar = parseCalendar( date.getText(), dateFormat); new DatePickerDialog( this, this, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH)).show(); } else if(view == time) { final Calendar calendar = parseCalendar( time.getText(), timeFormat); new TimePickerDialog( this, this, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), false).show(); } } public void onDateSet( final DatePicker picker, final int year, final int month, final int day) { final Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.YEAR, year); calendar.set(Calendar.MONTH, month); calendar.set(Calendar.DAY_OF_MONTH, day); date.setText(dateFormat.format(calendar.getTime()));