Lecture 3 demo.

Author: Roger Hu

.gitignore

@@ -0,0 +1,66 @@
+# Source: https://gist.github.com/nesquena/5617544/raw/53710b374e7df3302df43b552488d876040ada3d/.gitignore
+
+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Eclipse project files
+.classpath
+.project
+
+# Proguard folder generated by Eclipse
+proguard/
+proguard-project.txt
+
+# Intellij project files
+*.iml
+*.ipr
+*.iws
+.idea/
+
+*.pydevproject
+.project
+.metadata
+bin/**
+tmp/**
+tmp/**/*
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.classpath
+.settings/
+.loadpath
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# PDT-specific
+.buildpath
+
+# Android Studio project files
+*.iml
+.gradle
+.idea
+build
+import-summary.txt

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

@@ -0,0 +1,25 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 21
+    buildToolsVersion "21.1.2"
+
+    defaultConfig {
+        applicationId "codepath.com.myfun"
+        minSdkVersion 16
+        targetSdkVersion 21
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile 'com.android.support:appcompat-v7:21.0.3'
+}

app/proguard-rules.pro

@@ -0,0 +1,17 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/rhu/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

app/src/androidTest/java/codepath/com/myfun/ApplicationTest.java

@@ -0,0 +1,13 @@
+package codepath.com.myfun;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="codepath.com.myfun" >
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

app/src/main/java/codepath/com/myfun/ImageLinkCount.java

@@ -0,0 +1,39 @@
+package codepath.com.myfun;
+
+public class ImageLinkCount {
+    private long id;
+    private String URL;
+    private int timesSeen;
+
+    public ImageLinkCount(String URL, int timesSeen) {
+        setURL(URL);
+        setTimesSeen(timesSeen);
+    }
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getURL() {
+        return URL;
+    }
+
+    public void setURL(String URL) {
+        this.URL = URL;
+    }
+
+    public int getTimesSeen() {
+        return timesSeen;
+    }
+
+    public void setTimesSeen(int timesSeen) {
+        this.timesSeen = timesSeen;
+    }
+
+    public void incrementTimesSeen() {
+        this.timesSeen += 1;
+    }
+}

app/src/main/java/codepath/com/myfun/ImageLinksCountDatabase.java

@@ -0,0 +1,109 @@
+package codepath.com.myfun;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+public class ImageLinksCountDatabase extends SQLiteOpenHelper {
+
+    private static final int DATABASE_VERSION = 1;
+
+    private static final String DATABASE_NAME = "abc";
+
+    private static final String TABLE_LINKS = "link_items";
+
+    private static final String KEY_ID = "id";
+    private static final String KEY_URL = "url";
+    private static final String KEY_TIMES_SEEN = "times_seen";
+
+    ImageLinksCountDatabase(Context context) {
+        super(context, DATABASE_NAME, null, DATABASE_VERSION);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        String CREATE_ITEMS_TABLE = String.format("CREATE TABLE %s (%s INTEGER PRIMARY KEY, %s TEXT, %s INTEGER)",
+                TABLE_LINKS, KEY_ID, KEY_URL, KEY_TIMES_SEEN);
+        Log.d("DEBUG", CREATE_ITEMS_TABLE);
+        db.execSQL(CREATE_ITEMS_TABLE);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        if (newVersion == 1) {
+            db.execSQL("DROP TABLE IF EXISTS " + TABLE_LINKS);
+            onCreate(db);
+        }
+    }
+
+    public ImageLinkCount getRecord(String url) {
+
+        SQLiteDatabase db = this.getReadableDatabase();
+
+        Cursor cursor = db.query(TABLE_LINKS,
+                     new String[] { KEY_ID, KEY_URL, KEY_TIMES_SEEN}, // SELECT
+                     String.format("%s= ?", KEY_URL), new String[] {url},
+                     null, null, null, null);
+
+        if (cursor != null) {
+            if (!cursor.moveToFirst()) {
+                return null;
+            }
+            ImageLinkCount item = new ImageLinkCount(cursor.getString(1), cursor.getInt(2));
+            item.setId(cursor.getInt(0));
+            return item;
+        }
+        return null;
+    }
+
+    public ImageLinkCount createRecord(String url) {
+
+        SQLiteDatabase db = this.getWritableDatabase();
+
+        ContentValues values = new ContentValues();
+        values.put(KEY_URL, url);
+        values.put(KEY_TIMES_SEEN, 0);
+
+        long row = db.insertOrThrow(TABLE_LINKS, null, values);
+        db.close();
+
+        if (row != -1) {
+            ImageLinkCount item = new ImageLinkCount(url, 0);
+            item.setId(row);
+            return item;
+        }
+        return null;
+    }
+
+    public int updateItem(ImageLinkCount item) {
+        SQLiteDatabase db = this.getWritableDatabase();
+
+        ContentValues values = new ContentValues();
+        values.put(KEY_URL, item.getURL());
+        values.put(KEY_TIMES_SEEN, item.getTimesSeen());
+
+        int result = db.update(TABLE_LINKS, values, KEY_ID + " = ?",
+                new String[] { String.valueOf(item.getId()) });
+
+        db.close();
+        return result;
+    }
+
+    public ImageLinkCount getOrCreate(String url) {
+        SQLiteDatabase db = this.getWritableDatabase();
+
+        ImageLinkCount imageLinkCount = getRecord(url);
+
+        if (imageLinkCount == null) {
+            return createRecord(url);
+        } else {
+        }
+        db.close();
+        return imageLinkCount;
+    }
+
+}
+

app/src/main/java/codepath/com/myfun/Kittens.java

@@ -0,0 +1,64 @@
+package codepath.com.myfun;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.AsyncTask;
+import android.widget.ImageView;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class Kittens {
+
+    public static Kittens kittens;
+
+    public static void load(String url, ImageView imageView) {
+        if (kittens == null) {
+            kittens = new Kittens();
+        }
+        kittens.loadPrivate(url, imageView);
+        ImageLinksCountDatabase imageLinkCountDatabase = new ImageLinksCountDatabase(imageView.getContext());
+        ImageLinkCount imageLinkCount = imageLinkCountDatabase.getOrCreate(url);
+        imageLinkCount.incrementTimesSeen();
+        imageLinkCountDatabase.updateItem(imageLinkCount);
+    }
+
+    protected void loadPrivate(String url, ImageView imageView) {
+        new ImageLoader(imageView).execute(url);
+    }
+
+    public class ImageLoader extends AsyncTask<String, Void, Bitmap> {
+
+        // make a URL connection
+        // open a stream
+        // convert the bytes
+
+        private ImageView imageView;
+
+        public ImageLoader(ImageView imageView) {
+            this.imageView = imageView;
+        }
+        @Override
+        protected Bitmap doInBackground(String... params) {
+            try {
+                URL url = new URL(params[0]);
+                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+                connection.connect();
+                InputStream in = connection.getInputStream();
+                Bitmap bitmap = BitmapFactory.decodeStream(in);
+                in.close();
+                return bitmap;
+            } catch (IOException e) {
+            }
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Bitmap bitmap) {
+            super.onPostExecute(bitmap);
+            imageView.setImageBitmap(bitmap);
+        }
+    }
+}