Java tutorial
/* * Copyright 2010 Google Inc. * * 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.google.android.apps.iosched.ui; import com.google.android.apps.iosched.R; import com.google.android.apps.iosched.provider.ScheduleContract.Tracks; import com.google.android.apps.iosched.provider.ScheduleContract.Vendors; import com.google.android.apps.iosched.service.SyncService; import com.google.android.apps.iosched.util.FractionalTouchDelegate; import com.google.android.apps.iosched.util.NotifyingAsyncQueryHandler; import com.google.android.apps.iosched.util.ParserUtils; import com.google.android.apps.iosched.util.UIUtils; import com.google.android.apps.iosched.util.NotifyingAsyncQueryHandler.AsyncQueryListener; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.util.EntityUtils; import android.app.Activity; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.RectF; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.CompoundButton; import android.widget.ImageView; import android.widget.TextView; import android.widget.CompoundButton.OnCheckedChangeListener; /** * {@link Activity} that displays details about a specific * {@link Vendors#VENDOR_ID}, as requested through {@link Intent#getData()}. */ public class VendorDetailActivity extends Activity implements AsyncQueryListener, OnCheckedChangeListener { private static final String TAG = "VendorDetailActivity"; private Uri mVendorUri; private String mTrackId; private TextView mName; private TextView mLocation; private CompoundButton mStarred; private ImageView mLogo; private TextView mUrl; private TextView mDesc; private TextView mProductDesc; private NotifyingAsyncQueryHandler mHandler; public static final String EXTRA_TRACK = "com.google.android.iosched.extra.TRACK"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_vendor_detail); mName = (TextView) findViewById(R.id.vendor_name); mLocation = (TextView) findViewById(R.id.vendor_location); mStarred = (CompoundButton) findViewById(R.id.star_button); mStarred.setFocusable(true); mStarred.setClickable(true); // Larger target triggers star toggle final View starParent = findViewById(R.id.list_item_vendor); FractionalTouchDelegate.setupDelegate(starParent, mStarred, new RectF(0.6f, 0f, 1f, 0.8f)); mLogo = (ImageView) findViewById(R.id.vendor_logo); mUrl = (TextView) findViewById(R.id.vendor_url); mDesc = (TextView) findViewById(R.id.vendor_desc); mProductDesc = (TextView) findViewById(R.id.vendor_product_desc); final Intent intent = getIntent(); mVendorUri = intent.getData(); // Start background query to load vendor details mHandler = new NotifyingAsyncQueryHandler(getContentResolver(), this); mHandler.startQuery(mVendorUri, VendorsQuery.PROJECTION); } /** {@inheritDoc} */ public void onQueryComplete(int token, Object cookie, Cursor cursor) { try { if (!cursor.moveToFirst()) return; mName.setText(cursor.getString(VendorsQuery.NAME)); mLocation.setText(cursor.getString(VendorsQuery.LOCATION)); // Unregister around setting checked state to avoid triggering // listener since change isn't user generated. mStarred.setOnCheckedChangeListener(null); mStarred.setChecked(cursor.getInt(VendorsQuery.STARRED) != 0); mStarred.setOnCheckedChangeListener(this); // Start background fetch to load vendor logo final String logoUrl = cursor.getString(VendorsQuery.LOGO_URL); new VendorLogoTask().execute(logoUrl); mUrl.setText(cursor.getString(VendorsQuery.URL)); mDesc.setText(cursor.getString(VendorsQuery.DESC)); mProductDesc.setText(cursor.getString(VendorsQuery.PRODUCT_DESC)); mTrackId = cursor.getString(VendorsQuery.TRACK_ID); // Assign track details when found // TODO: handle vendors not attached to track ((TextView) findViewById(R.id.title_text)).setText(cursor.getString(VendorsQuery.TRACK_NAME)); UIUtils.setTitleBarColor(findViewById(R.id.title_container), cursor.getInt(VendorsQuery.TRACK_COLOR)); } finally { cursor.close(); } } /** Handle "home" title-bar action. */ public void onHomeClick(View v) { UIUtils.goHome(this); } /** Handle "search" title-bar action. */ public void onSearchClick(View v) { UIUtils.goSearch(this); } /** Handle "map" title-bar action. */ public void onMapClick(View v) { // The room ID for the sandbox, in the map, is just the track ID final Intent intent = new Intent(this, MapActivity.class); intent.putExtra(MapActivity.EXTRA_ROOM, ParserUtils.translateTrackIdAliasInverse(mTrackId)); startActivity(intent); } /** Handle toggling of starred checkbox. */ public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { final ContentValues values = new ContentValues(); values.put(Vendors.STARRED, isChecked ? 1 : 0); mHandler.startUpdate(mVendorUri, values); } private static HttpClient sHttpClient; private static synchronized HttpClient getHttpClient(Context context) { if (sHttpClient == null) { sHttpClient = SyncService.getHttpClient(context); } return sHttpClient; } private class VendorLogoTask extends AsyncTask<String, Void, Bitmap> { @Override protected Bitmap doInBackground(String... params) { final String param = params[0]; try { final Context context = VendorDetailActivity.this; final HttpClient httpClient = getHttpClient(context); final HttpResponse resp = httpClient.execute(new HttpGet(param)); final HttpEntity entity = resp.getEntity(); final int statusCode = resp.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK || entity == null) return null; final byte[] respBytes = EntityUtils.toByteArray(entity); return BitmapFactory.decodeByteArray(respBytes, 0, respBytes.length); } catch (Exception e) { Log.w(TAG, "Problem while loading vendor logo: " + e.toString()); } return null; } @Override protected void onPostExecute(Bitmap result) { if (result == null) { mLogo.setVisibility(View.GONE); } else { mLogo.setVisibility(View.VISIBLE); mLogo.setImageBitmap(result); } } } /** {@link Vendors} query parameters. */ private interface VendorsQuery { String[] PROJECTION = { Vendors.NAME, Vendors.LOCATION, Vendors.DESC, Vendors.URL, Vendors.PRODUCT_DESC, Vendors.LOGO_URL, Vendors.STARRED, Vendors.TRACK_ID, Tracks.TRACK_NAME, Tracks.TRACK_COLOR, }; int NAME = 0; int LOCATION = 1; int DESC = 2; int URL = 3; int PRODUCT_DESC = 4; int LOGO_URL = 5; int STARRED = 6; int TRACK_ID = 7; int TRACK_NAME = 8; int TRACK_COLOR = 9; } }