Created ChatumLatinum activity

Render/.gitignore

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+build/
+.idea
+.gradle
+*.iml
+local.properties
+.DS_Store
+app/libs

Render/app/.gitignore

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+build/

Render/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 21
+    buildToolsVersion "21.1.2"
+
+    defaultConfig {
+        applicationId "com.example.android.mobileperf.render"
+        minSdkVersion 9
+        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-v7:21.0.0'
+    compile 'com.squareup.picasso:picasso:2.2.0'
+}

Render/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/shailentuli/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 *;
+#}

Render/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.android.mobileperf.render" >
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/Theme.Base" >
+        <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>
+        <activity
+            android:name=".ChatumLatinumActivity"
+            android:label="@string/title_activity_chatum_latinum" >
+        </activity>
+    </application>
+
+</manifest>

Render/app/src/main/java/com/example/android/mobileperf/render/Chat.java

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+/*
+ * 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.mobileperf.render;
+
+import java.util.Date;
+
+/**
+ * Describes a Chat message written by a Droid author, consisting of some text and a timestamp.
+ */
+public class Chat {
+    /**
+     * The author of the chat.
+     */
+    private Droid author;
+
+    /**
+     * The chat content. This is hardcoded in this sample (see ChatsFragment.java).
+     */
+    private String text;
+
+    /**
+     * The time a chat was posted to the chat board.
+     */
+    private Date datetime;
+
+    public Chat(Droid author, String text, Date datetime) {
+        this.author = author;
+        this.text = text;
+        this.datetime = datetime;
+    }
+
+    public Droid getAuthor() {return author;}
+    public String getText() {return text;}
+    public Date getDatetime() {return datetime;}
+}

Render/app/src/main/java/com/example/android/mobileperf/render/ChatAdapter.java

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+/*
+ * 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.mobileperf.render;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.text.format.DateUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.squareup.picasso.Picasso;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+/**
+ * A custom adapter that is backed by an array of Chat objects. References a TextView with the name
+ * of a chat author (a Droid), a TextView with a chat's text, another TextView with the chat's
+ * timestamp, and an ImageView for the chat author's avatar.
+ */
+public class ChatAdapter extends ArrayAdapter<Chat> {
+    public ChatAdapter(Context context, ArrayList<Chat> chats) {
+        super(context, 0, chats);
+    }
+
+    @Override
+    public View getView(int position, View view, ViewGroup parent) {
+
+        Chat chat = getItem(position);
+        if (view == null) {
+            view = LayoutInflater.from(getContext()).inflate(
+                    R.layout.chat_item, parent, false);
+        }
+
+        // Find the UI widgets for a chat item.
+        TextView chat_author_name = (TextView) view.findViewById(R.id.chat_author_name);
+        TextView chat_text = (TextView) view.findViewById(R.id.chat_text);
+        TextView chat_datetime = (TextView) view.findViewById(R.id.chat_datetime);
+        ImageView chat_author_avatar = (ImageView) view.findViewById(R.id.chat_author_avatar);
+
+        // Display the author's name using the color associated with the author.
+        chat_author_name.setText(chat.getAuthor().getName());
+        chat_author_name.setTextColor(chat.getAuthor().getColor());
+
+        // Display the chat text.
+        chat_text.setText(chat.getText());
+
+        // Set the timestamp for the chat in "x minutes ago" format.
+        chat_datetime.setText(DateUtils.getRelativeTimeSpanString(
+                chat.getDatetime().getTime(),
+                new Date().getTime(),
+                DateUtils.MINUTE_IN_MILLIS,
+                DateUtils.FORMAT_ABBREV_RELATIVE));
+
+
+        // Display the chat author's avatar (a droid image) and a background color associated with
+        // the author.
+        if (chat.getAuthor().getAvatarId() != 0) {
+            Picasso.with(getContext()).load(chat.getAuthor().getAvatarId()).into(
+                    chat_author_avatar);
+        }
+        chat_author_avatar.setBackgroundColor(chat.getAuthor().getColor());
+
+        return view;
+    }
+}

Render/app/src/main/java/com/example/android/mobileperf/render/ChatsFragment.java

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+/*
+ * 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.mobileperf.render;
+
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ListView;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+
+/**
+ * Fragment that encapsulates creating {@link Chat} objects and displaying them using a
+ * {@link ListView} layout.
+ * Creates seed data consisting of a handful of chats authored by a few authors.
+ */
+public class ChatsFragment extends Fragment {
+    protected static int MILLISECONDS_PER_SECOND = 1000;
+    protected static int SECONDS_PER_MINUTE = 60;
+
+    public ChatsFragment() {}
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        // Create a list of chats and populate it with hardcoded data.
+        ArrayList<Chat> chats = new ArrayList<Chat>();
+        populateChats(chats);
+
+        // Create the adapter that provides values to the UI Widgets.
+        ChatAdapter adapter = new ChatAdapter(getActivity(), chats);
+
+        View rootView = inflater.inflate(R.layout.fragment_chats, container, false);
+
+        // Find the ListView that holds all the chat messages and attach it to the adapter,
+        ListView listView = (ListView) rootView.findViewById(R.id.listview_chats);
+        listView.setAdapter(adapter);
+
+        return rootView;
+    }
+
+    private Date getTimeInPast(int minutesAgo) {
+        return new Date(new Date().getTime() -
+                (minutesAgo * SECONDS_PER_MINUTE * MILLISECONDS_PER_SECOND));
+    }
+
+    // Creates hardcoded chat objects.
+    private void populateChats(ArrayList<Chat> chats) {
+        Resources res = getResources();
+        Droid alex = new Droid("alex", res.getColor(R.color.alex_color));
+        Droid joanna = new Droid("joanna", res.getColor(R.color.joanna_color), R.drawable.joanna);
+        Droid shailen = new Droid("shailen", res.getColor(R.color.shailen_color),
+                R.drawable.shailen);
+
+        chats.add(new Chat(alex, "Lorem ipsum dolor sit amet, orci nullam cra",
+                getTimeInPast(15)));
+
+        chats.add(new Chat(joanna, "Omnis aptent magnis suspendisse ipsum, semper egestas " +
+                "magna auctor maecenas",
+                getTimeInPast(11)));
+
+        chats.add(new Chat(shailen, "eu nibh, rhoncus wisi posuere lacus, ad erat egestas " +
+                "quam, magna ante ultricies sem",
+                getTimeInPast(9)));
+
+        chats.add(new Chat(alex, "rhoncus wisi posuere lacus, ad erat egestas quam, magna " +
+                "ante ultricies sem lacus",
+                getTimeInPast(8)));
+
+        chats.add(new Chat(shailen, "Enim justo nisl sit proin, quis vestibulum vivamus " +
+                "suscipit penatibus et id, tempus mauris a lacus blandit, aenean praesent " +
+                "arcu scelerisque sociosqu. Nonummy at ut ullamcorper nulla, ligula id, " +
+                "nullam donec nisl ante turpis duis mauris, dolor imperdiet a inceptos aliquam",
+                getTimeInPast(8)));
+
+        chats.add(new Chat(joanna, "Omnis aptent magnis.",
+                getTimeInPast(7)));
+
+        chats.add(new Chat(alex, "Metus tincidunt sit in urna.",
+                getTimeInPast(6)));
+
+        chats.add(new Chat(shailen, "Non blandit nulla dapibus, vitae quisque sed cras mi " +
+                "leo condimentum sociosqu quis sed pharetra",
+                getTimeInPast(4)));
+
+        chats.add(new Chat(joanna, "Enim justo nisl sit proin, quis vestibulum vivamus " +
+                "suscipit penatibus et id, tempus mauris a lacus blandit, aenean praesent " +
+                "arcu scelerisque sociosqu. Nonummy at ut ullamcorper nulla, ligula id, " +
+                "nullam donec nisl ante turpis duis mauris, dolor imperdiet a inceptos.",
+                getTimeInPast(3)));
+    }
+}

Render/app/src/main/java/com/example/android/mobileperf/render/ChatumLatinumActivity.java

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+/*
+ * 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.mobileperf.render;
+
+import android.os.Bundle;
+import android.support.v7.app.ActionBarActivity;
+
+/**
+ * Displays a fragment that contains a ListView holding several Chat objects. Used in this lesson
+ * to show a) how to reduce overdraws, and b) how to flatten needlessly nested hierarchies.
+ */
+public class ChatumLatinumActivity extends ActionBarActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_chatum_latinum);
+
+        if (savedInstanceState == null) {
+            getSupportFragmentManager().beginTransaction()
+                    .add(R.id.activity_chatum_latinum_container, new ChatsFragment())
+                    .commit();
+        }
+    }
+}