Java tutorial
/* * Copyright 2013 Adam Saturna * Copyright 2013 Brian Trinh * Copyright 2013 Ethan Mykytiuk * Copyright 2013 Prateek Srivastava (@f2prateek) * * 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.cmput301.recipebot.ui; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.support.v4.view.ViewPager; import android.util.Log; import android.view.LayoutInflater; import android.widget.*; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.cmput301.recipebot.R; import com.cmput301.recipebot.model.beans.Recipe; import com.google.gson.Gson; import roboguice.inject.InjectView; import java.io.File; import java.io.FileOutputStream; import java.util.List; import static com.cmput301.recipebot.util.LogUtils.makeLogTag; /** * An abstract {@link android.app.Activity} that displays a Recipe to the user. * It sets up a share action provider to share the recipe and the views that should be displayed to the user. */ public abstract class AbstractRecipeActivity extends BaseActivity implements CompoundButton.OnCheckedChangeListener { public static final String EXTRA_RECIPE = "EXTRA_RECIPE"; private static final String LOGTAG = makeLogTag(AbstractRecipeActivity.class); protected static final int TYPE_INGREDIENT = 100; protected static final int TYPE_DIRECTION = 200; protected static final int TYPE_TAG = 300; @InjectView(R.id.pager_recipe_images) ViewPager mViewPhotos; @InjectView(R.id.list_directions) LinearLayout mListViewDirections; @InjectView(R.id.list_ingredients) LinearLayout mListViewIngredients; @InjectView(R.id.list_tags) LinearLayout mListViewTags; @InjectView(R.id.editText_recipe_name) EditText mEditTextRecipeName; @InjectView(R.id.editText_recipe_description) EditText mEditTextRecipeDescription; @InjectView(R.id.editText_direction) EditText mEditTextDirection; @InjectView(R.id.button_add_direction) ImageButton mButtonAddDirection; @InjectView(R.id.editText_ingredient_name) EditText mEditTextIngredientName; @InjectView(R.id.editText_ingredient_quantity) EditText mEditTextIngredientQuantity; @InjectView(R.id.editText_ingredient_unit) EditText mEditTextIngredientUnit; @InjectView(R.id.button_add_ingredient) ImageButton mButtonAddIngredient; @InjectView(R.id.editText_tag) EditText mEditTextTag; @InjectView(R.id.button_add_tag) ImageButton mButtonAddTag; protected Recipe mRecipe; // Keep a global reference to this since we want to update the recipe when user clicks save. private com.actionbarsherlock.widget.ShareActionProvider mShareActionProvider; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recipe); if (getIntent().getExtras() != null) { mRecipe = getIntent().getParcelableExtra(EXTRA_RECIPE); } fillView(); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getSupportMenuInflater(); inflater.inflate(R.menu.activity_recipe, menu); MenuItem actionItem = menu.findItem(R.id.recipe_menu_share); mShareActionProvider = (com.actionbarsherlock.widget.ShareActionProvider) actionItem.getActionProvider(); mShareActionProvider.setShareHistoryFileName( com.actionbarsherlock.widget.ShareActionProvider.DEFAULT_SHARE_HISTORY_FILE_NAME); if (mRecipe != null) { new WriteRecipeToFileTask().execute(mRecipe); } return super.onCreateOptionsMenu(menu); } /** * Fill our views. */ protected void fillView() { setPhotos(); mEditTextRecipeName.setText(mRecipe.getName()); mEditTextRecipeDescription.setText(mRecipe.getDescription()); fillListLayout(mListViewDirections, mRecipe.getDirections(), TYPE_DIRECTION); fillListLayout(mListViewIngredients, mRecipe.getIngredients(), TYPE_INGREDIENT); fillListLayout(mListViewTags, mRecipe.getTags(), TYPE_TAG); } /** * Display the images to the user. */ public abstract void setPhotos(); /** * A method that fills a {@link LinearLayout} with data from a List of data. * We don't use {@link android.widget.ListView} since we don't need scrolling, our {@link android.widget.ScrollView} handles * that for us. * * @param listDirections the layout to fill * @param dataset the data that should be displayed. */ protected void fillListLayout(LinearLayout listDirections, List dataset, int type) { LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); //Sanitize the view listDirections.removeAllViews(); for (int i = 0; i < dataset.size(); i++) { Object data = dataset.get(i); CheckBox checkBox = (CheckBox) layoutInflater.inflate(R.layout.checkbox_view, null); checkBox.setText(data.toString()); TaggedItem item = new TaggedItem(); item.type = type; item.data = data; checkBox.setTag(item); checkBox.setOnCheckedChangeListener(this); listDirections.addView(checkBox, i); } } class TaggedItem<T> { T data; int type; } /** * A task that writes the recipe to a file for sharing. * In our case, we're simply storing it as a Json file. */ class WriteRecipeToFileTask extends AsyncTask<Recipe, Void, File> { private static final String STORAGE_DIRECTORY = "RecipeBot"; @Override protected File doInBackground(Recipe... params) { Recipe recipe = params[0]; File file = new File(getStorageDirectory(), recipe.getId() + ".json"); FileOutputStream outputStream; Gson gson = new Gson(); try { outputStream = new FileOutputStream(file); outputStream.write(gson.toJson(recipe, Recipe.class).getBytes()); outputStream.close(); } catch (Exception e) { e.printStackTrace(); } return file; } @Override protected void onPostExecute(File file) { super.onPostExecute(file); mShareActionProvider.setShareIntent(createShareIntent(mRecipe, file)); } protected File getStorageDirectory() { // Get the directory for the user's public pictures directory. File file = new File(Environment.getExternalStorageDirectory(), STORAGE_DIRECTORY); if (!file.exists()) { if (!file.mkdirs()) { Log.e(LOGTAG, "Directory not created, " + file.getAbsolutePath()); } } return file; } /* Checks if external storage is available for read and write */ protected boolean isExternalStorageWritable() { String state = Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state)) { return true; } return false; } /* Checks if external storage is available to at least read */ protected boolean isExternalStorageReadable() { String state = Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { return true; } return false; } } /** * Creates a sharing {@link android.content.Intent}. * Shares mRecipe, doesn't get it from the UI. * * @return The sharing intent. */ private static Intent createShareIntent(Recipe recipe, File file) { Intent shareIntent = new Intent(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_SUBJECT, recipe.getName()); shareIntent.putExtra(Intent.EXTRA_TITLE, recipe.getName()); shareIntent.putExtra(Intent.EXTRA_TEXT, recipe.toEmail()); shareIntent.setType("application/json"); shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); return shareIntent; } }