JustForUs/justforus/src/main/java/com/example/android/justforus/MainActivity.java - platform/developers/demos - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * 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.example.android.justforus;

 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.v4.app.ShareCompat;
 import android.support.v7.app.ActionBarActivity;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.BaseAdapter;
 import android.widget.GridView;
 import android.widget.ImageView;
 import android.widget.TextView;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * Activity to display a grid of coupons. The number of columns varies based on screen width,
  * and goes down to a one-column grid on a small device such as a phone.
  *
  * <p>A coupon consists of a photo, title, and subtitle.
  *
  * <p>Tapping on a coupon to redeem it brings up the Android "share"
  * dialog with a pre-populated message based on the coupon text.
  */
 public class MainActivity extends ActionBarActivity implements OnItemClickListener {

     // Name of person giving out these coupons. When the user clicks on a coupon and shares
     // to another app, this name will be part of the pre-populated text.
     // TODO: Fill in your name here
     private static final String SENDER_NAME = "";

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         // Set activity_main.xml to be the layout for this activity
         setContentView(R.layout.activity_main);

         // Fetch the {@link LayoutInflater} service so that new views can be created
         LayoutInflater inflater = (LayoutInflater) getSystemService(
                 Context.LAYOUT_INFLATER_SERVICE);

         // Find the {@link GridView} that was already defined in the XML layout
         GridView gridView = (GridView) findViewById(R.id.grid);

         // Initialize the adapter with all the coupons. Set the adapter on the {@link GridView}.
         gridView.setAdapter(new CouponAdapter(inflater, createAllCoupons()));

         // Set a click listener for each coupon in the grid
         gridView.setOnItemClickListener(this);
     }

     /**
      * Generate the list of all coupons.
      * @return The list of coupons.
      */
     private List<Coupon> createAllCoupons() {
         // TODO: Customize this list of coupons for your personal use.
         // You can add a title, subtitle, and a photo (in the assets directory).
         List<Coupon> coupons = new ArrayList<Coupon>();
         coupons.add(new Coupon("Walk in the park" /* title */,
                 "Take a stroll in the flower garden" /* subtitle */, "park.jpg" /* image */));
         coupons.add(new Coupon("Trip to the zoo",
                 "See the cute zoo animals", "zoo.jpg"));
         coupons.add(new Coupon("Watch sunrise",
                 "Drive out to the vista point and watch the sunrise at 6am", "sunrise.jpg"));
         coupons.add(new Coupon("Hawaii getaway",
                 "Relax in Hawaii by going to the beach and attending luaus", "hawaii.jpg"));
         coupons.add(new Coupon("Spa day",
                 "Receive a massage and enjoy the peace and quiet", "spa.jpg"));
         coupons.add(new Coupon("Homemade dinner",
                 "Your favorite meal cooked by yours truly", "dinner.jpg"));
         coupons.add(new Coupon("Day on the water",
                 "Boat ride down the river on a breezy day", "boat.jpg"));
         coupons.add(new Coupon("Flowers",
                 "Delivered to your front door", "rose.jpg"));
         coupons.add(new Coupon("Picnic",
                 "Wine, bread, and cheese at the vineyard", "picnic.jpg"));
         coupons.add(new Coupon("Surprise gift",
                 "Won't be revealed until redeemed", "present.jpg"));
         return coupons;
     }

     /**
      * Callback method for a when a coupon is clicked. A new share intent is created with the
      * coupon title. Then the user can select which app to share the content of the coupon with.
      *
      * @param parent The AdapterView where the click happened.
      * @param view The view within the AdapterView that was clicked (this
      *            will be a view provided by the adapter).
      * @param position The position of the view in the adapter.
      * @param id The row id of the item that was clicked.
      */
     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
         // Find coupon that was clicked based off of position in adapter
         Coupon coupon = (Coupon) parent.getItemAtPosition(position);

         // Create share intent
         Intent shareIntent = ShareCompat.IntentBuilder.from(this)
                 .setText(getShareText(coupon))
                 .setType("image/jpeg")
                 .setStream(coupon.mImageUri)
                 .setChooserTitle(getString(R.string.redeem_using))
                 .createChooserIntent();
         startActivity(shareIntent);
     }

     /**
      * Create the share intent text based on the coupon title, subtitle, and whether or not
      * there is a {@link #SENDER_NAME}.
      *
      * @param coupon to create the intent text for.
      * @return string to be used in the share intent.
      */
     private String getShareText(Coupon coupon) {
         // If there is no sender name, just use the coupon title and subtitle
         if (TextUtils.isEmpty(SENDER_NAME)) {
             return getString(R.string.message_format_without_sender,
                     coupon.mTitle, coupon.mSubtitle);
         } else {
             // Otherwise, use the other string template and pass in the {@link #SENDER_NAME} too
             return getString(R.string.message_format_with_sender, SENDER_NAME,
                     coupon.mTitle, coupon.mSubtitle);
         }
     }

     /**
      * Adapter for grid of coupons.
      */
     private static class CouponAdapter extends BaseAdapter {

         private LayoutInflater mInflater;
         private List<Coupon> mAllCoupons;

         /**
          * Constructs a new {@link CouponAdapter}.
          *
          * @param inflater to create new views
          * @param allCoupons for list of all coupons to be displayed
          */
         public CouponAdapter(LayoutInflater inflater, List<Coupon> allCoupons) {
             if (allCoupons == null) {
                 throw new IllegalStateException("Can't have null list of coupons");
             }
             mAllCoupons = allCoupons;
             mInflater = inflater;
         }

         @Override
         public int getCount() {
             return mAllCoupons.size();
         }

         @Override
         public Coupon getItem(int position) {
             return mAllCoupons.get(position);
         }

         @Override
         public long getItemId(int position) {
             return position;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             View result = convertView;
             if (result == null) {
                 result = mInflater.inflate(R.layout.grid_item, parent, false);
             }

             // Try to get view cache or create a new one if needed
             ViewCache viewCache = (ViewCache) result.getTag();
             if (viewCache == null) {
                 viewCache = new ViewCache(result);
                 result.setTag(viewCache);
             }

             // Fetch item
             Coupon coupon = getItem(position);

             // Bind the data
             viewCache.mTitleView.setText(coupon.mTitle);
             viewCache.mSubtitleView.setText(coupon.mSubtitle);
             viewCache.mImageView.setImageURI(coupon.mImageUri);

             return result;
         }
     }

     /**
      * Cache of views in the grid item view to make recycling of views quicker. This avoids
      * additional {@link View#findViewById(int)} calls after the {@link ViewCache} is first
      * created for a view. See
      * {@link CouponAdapter#getView(int position, View convertView, ViewGroup parent)}.
      */
     private static class ViewCache {

         /** View that displays the title of the coupon */
         private final TextView mTitleView;

         /** View that displays the subtitle of the coupon */
         private final TextView mSubtitleView;

         /** View that displays the image associated with the coupon */
         private final ImageView mImageView;

         /**
          * Constructs a new {@link ViewCache}.
          *
          * @param view which contains children views that should be cached.
          */
         private ViewCache(View view) {
             mTitleView = (TextView) view.findViewById(R.id.title);
             mSubtitleView = (TextView) view.findViewById(R.id.subtitle);
             mImageView = (ImageView) view.findViewById(R.id.image);
         }
     }

     /**
      * Model object for coupon.
      */
     private static class Coupon {

         /** Title of the coupon. */
         private final String mTitle;

         /** Description of the coupon. */
         private final String mSubtitle;

         /** Content URI of the image for the coupon. */
         private final Uri mImageUri;

         /**
          * Constructs a new {@link Coupon}.
          *
          * @param titleString is the title
          * @param subtitleString is the description
          * @param imageAssetFilePath is the file path from the application's assets folder for
          *                           the image associated with this coupon
          */
         private Coupon(String titleString, String subtitleString, String imageAssetFilePath) {
             mTitle = titleString;
             mSubtitle = subtitleString;
             mImageUri = Uri.parse("content://" + AssetProvider.CONTENT_URI + "/" +
                     imageAssetFilePath);
         }
     }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* 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.example.android.justforus;

	import android.content.Context;
	import android.content.Intent;
	import android.net.Uri;
	import android.os.Bundle;
	import android.support.v4.app.ShareCompat;
	import android.support.v7.app.ActionBarActivity;
	import android.text.TextUtils;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.BaseAdapter;
	import android.widget.GridView;
	import android.widget.ImageView;
	import android.widget.TextView;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* Activity to display a grid of coupons. The number of columns varies based on screen width,
	* and goes down to a one-column grid on a small device such as a phone.
	*
	* <p>A coupon consists of a photo, title, and subtitle.
	*
	* <p>Tapping on a coupon to redeem it brings up the Android "share"
	* dialog with a pre-populated message based on the coupon text.
	*/
	public class MainActivity extends ActionBarActivity implements OnItemClickListener {

	// Name of person giving out these coupons. When the user clicks on a coupon and shares
	// to another app, this name will be part of the pre-populated text.
	// TODO: Fill in your name here
	private static final String SENDER_NAME = "";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	// Set activity_main.xml to be the layout for this activity
	setContentView(R.layout.activity_main);

	// Fetch the {@link LayoutInflater} service so that new views can be created
	LayoutInflater inflater = (LayoutInflater) getSystemService(
	Context.LAYOUT_INFLATER_SERVICE);

	// Find the {@link GridView} that was already defined in the XML layout
	GridView gridView = (GridView) findViewById(R.id.grid);

	// Initialize the adapter with all the coupons. Set the adapter on the {@link GridView}.
	gridView.setAdapter(new CouponAdapter(inflater, createAllCoupons()));

	// Set a click listener for each coupon in the grid
	gridView.setOnItemClickListener(this);
	}

	/**
	* Generate the list of all coupons.
	* @return The list of coupons.
	*/
	private List<Coupon> createAllCoupons() {
	// TODO: Customize this list of coupons for your personal use.
	// You can add a title, subtitle, and a photo (in the assets directory).
	List<Coupon> coupons = new ArrayList<Coupon>();
	coupons.add(new Coupon("Walk in the park" /* title */,
	"Take a stroll in the flower garden" /* subtitle /, "park.jpg" / image */));
	coupons.add(new Coupon("Trip to the zoo",
	"See the cute zoo animals", "zoo.jpg"));
	coupons.add(new Coupon("Watch sunrise",
	"Drive out to the vista point and watch the sunrise at 6am", "sunrise.jpg"));
	coupons.add(new Coupon("Hawaii getaway",
	"Relax in Hawaii by going to the beach and attending luaus", "hawaii.jpg"));
	coupons.add(new Coupon("Spa day",
	"Receive a massage and enjoy the peace and quiet", "spa.jpg"));
	coupons.add(new Coupon("Homemade dinner",
	"Your favorite meal cooked by yours truly", "dinner.jpg"));
	coupons.add(new Coupon("Day on the water",
	"Boat ride down the river on a breezy day", "boat.jpg"));
	coupons.add(new Coupon("Flowers",
	"Delivered to your front door", "rose.jpg"));
	coupons.add(new Coupon("Picnic",
	"Wine, bread, and cheese at the vineyard", "picnic.jpg"));
	coupons.add(new Coupon("Surprise gift",
	"Won't be revealed until redeemed", "present.jpg"));
	return coupons;
	}

	/**
	* Callback method for a when a coupon is clicked. A new share intent is created with the
	* coupon title. Then the user can select which app to share the content of the coupon with.
	*
	* @param parent The AdapterView where the click happened.
	* @param view The view within the AdapterView that was clicked (this
	* will be a view provided by the adapter).
	* @param position The position of the view in the adapter.
	* @param id The row id of the item that was clicked.
	*/
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
	// Find coupon that was clicked based off of position in adapter
	Coupon coupon = (Coupon) parent.getItemAtPosition(position);

	// Create share intent
	Intent shareIntent = ShareCompat.IntentBuilder.from(this)
	.setText(getShareText(coupon))
	.setType("image/jpeg")
	.setStream(coupon.mImageUri)
	.setChooserTitle(getString(R.string.redeem_using))
	.createChooserIntent();
	startActivity(shareIntent);
	}

	/**
	* Create the share intent text based on the coupon title, subtitle, and whether or not
	* there is a {@link #SENDER_NAME}.
	*
	* @param coupon to create the intent text for.
	* @return string to be used in the share intent.
	*/
	private String getShareText(Coupon coupon) {
	// If there is no sender name, just use the coupon title and subtitle
	if (TextUtils.isEmpty(SENDER_NAME)) {
	return getString(R.string.message_format_without_sender,
	coupon.mTitle, coupon.mSubtitle);
	} else {
	// Otherwise, use the other string template and pass in the {@link #SENDER_NAME} too
	return getString(R.string.message_format_with_sender, SENDER_NAME,
	coupon.mTitle, coupon.mSubtitle);
	}
	}

	/**
	* Adapter for grid of coupons.
	*/
	private static class CouponAdapter extends BaseAdapter {

	private LayoutInflater mInflater;
	private List<Coupon> mAllCoupons;

	/**
	* Constructs a new {@link CouponAdapter}.
	*
	* @param inflater to create new views
	* @param allCoupons for list of all coupons to be displayed
	*/
	public CouponAdapter(LayoutInflater inflater, List<Coupon> allCoupons) {
	if (allCoupons == null) {
	throw new IllegalStateException("Can't have null list of coupons");
	}
	mAllCoupons = allCoupons;
	mInflater = inflater;
	}

	@Override
	public int getCount() {
	return mAllCoupons.size();
	}

	@Override
	public Coupon getItem(int position) {
	return mAllCoupons.get(position);
	}

	@Override
	public long getItemId(int position) {
	return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	View result = convertView;
	if (result == null) {
	result = mInflater.inflate(R.layout.grid_item, parent, false);
	}

	// Try to get view cache or create a new one if needed
	ViewCache viewCache = (ViewCache) result.getTag();
	if (viewCache == null) {
	viewCache = new ViewCache(result);
	result.setTag(viewCache);
	}

	// Fetch item
	Coupon coupon = getItem(position);

	// Bind the data
	viewCache.mTitleView.setText(coupon.mTitle);
	viewCache.mSubtitleView.setText(coupon.mSubtitle);
	viewCache.mImageView.setImageURI(coupon.mImageUri);

	return result;
	}
	}

	/**
	* Cache of views in the grid item view to make recycling of views quicker. This avoids
	* additional {@link View#findViewById(int)} calls after the {@link ViewCache} is first
	* created for a view. See
	* {@link CouponAdapter#getView(int position, View convertView, ViewGroup parent)}.
	*/
	private static class ViewCache {

	/** View that displays the title of the coupon */
	private final TextView mTitleView;

	/** View that displays the subtitle of the coupon */
	private final TextView mSubtitleView;

	/** View that displays the image associated with the coupon */
	private final ImageView mImageView;

	/**
	* Constructs a new {@link ViewCache}.
	*
	* @param view which contains children views that should be cached.
	*/
	private ViewCache(View view) {
	mTitleView = (TextView) view.findViewById(R.id.title);
	mSubtitleView = (TextView) view.findViewById(R.id.subtitle);
	mImageView = (ImageView) view.findViewById(R.id.image);
	}
	}

	/**
	* Model object for coupon.
	*/
	private static class Coupon {

	/** Title of the coupon. */
	private final String mTitle;

	/** Description of the coupon. */
	private final String mSubtitle;

	/** Content URI of the image for the coupon. */
	private final Uri mImageUri;

	/**
	* Constructs a new {@link Coupon}.
	*
	* @param titleString is the title
	* @param subtitleString is the description
	* @param imageAssetFilePath is the file path from the application's assets folder for
	* the image associated with this coupon
	*/
	private Coupon(String titleString, String subtitleString, String imageAssetFilePath) {
	mTitle = titleString;
	mSubtitle = subtitleString;
	mImageUri = Uri.parse("content://" + AssetProvider.CONTENT_URI + "/" +
	imageAssetFilePath);
	}
	}
	}