From 24f7ff69ed5c63a10fd8277c514a377a68caec71 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Thu, 19 Feb 2026 22:01:12 +0000
Subject: [PATCH] Create monochromatic Android weather app for MV and PA

This CL creates a new Android application that displays hourly weather forecasts for Mountain View and Palo Alto, CA.

Features:
- Fetches weather data from Open-Meteo API.
- Displays hourly temperature for both locations side-by-side.
- Uses a monochromatic UI (black background, white/gray text).
- Includes Retrofit for networking and Gson for JSON parsing.
- Uses RecyclerView for efficient list display.
- Handles timezones correctly (America/Los_Angeles).

The project structure includes:
- Standard Android project layout (app module, src/main/java, src/main/res).
- Gradle build configuration.
- AndroidManifest with INTERNET permission.

Co-authored-by: hassler-google <130589279+hassler-google@users.noreply.github.com>
---
 android_weather_app/.gitignore                |  4 ++
 android_weather_app/app/build.gradle          | 36 ++++++++++
 .../app/src/main/AndroidManifest.xml          | 15 ++++
 .../java/com/example/weatherapp/Hourly.java   | 13 ++++
 .../com/example/weatherapp/MainActivity.java  | 70 +++++++++++++++++++
 .../example/weatherapp/WeatherAdapter.java    | 69 ++++++++++++++++++
 .../example/weatherapp/WeatherResponse.java   | 11 +++
 .../example/weatherapp/WeatherService.java    | 16 +++++
 .../app/src/main/res/layout/activity_main.xml | 65 +++++++++++++++++
 .../app/src/main/res/layout/item_weather.xml  | 38 ++++++++++
 .../app/src/main/res/values/colors.xml        | 12 ++++
 .../app/src/main/res/values/styles.xml        | 10 +++
 android_weather_app/build.gradle              | 20 ++++++
 android_weather_app/gradle.properties         |  1 +
 android_weather_app/settings.gradle           |  1 +
 15 files changed, 381 insertions(+)
 create mode 100644 android_weather_app/.gitignore
 create mode 100644 android_weather_app/app/build.gradle
 create mode 100644 android_weather_app/app/src/main/AndroidManifest.xml
 create mode 100644 android_weather_app/app/src/main/java/com/example/weatherapp/Hourly.java
 create mode 100644 android_weather_app/app/src/main/java/com/example/weatherapp/MainActivity.java
 create mode 100644 android_weather_app/app/src/main/java/com/example/weatherapp/WeatherAdapter.java
 create mode 100644 android_weather_app/app/src/main/java/com/example/weatherapp/WeatherResponse.java
 create mode 100644 android_weather_app/app/src/main/java/com/example/weatherapp/WeatherService.java
 create mode 100644 android_weather_app/app/src/main/res/layout/activity_main.xml
 create mode 100644 android_weather_app/app/src/main/res/layout/item_weather.xml
 create mode 100644 android_weather_app/app/src/main/res/values/colors.xml
 create mode 100644 android_weather_app/app/src/main/res/values/styles.xml
 create mode 100644 android_weather_app/build.gradle
 create mode 100644 android_weather_app/gradle.properties
 create mode 100644 android_weather_app/settings.gradle

diff --git a/android_weather_app/.gitignore b/android_weather_app/.gitignore
new file mode 100644
index 0000000..a7e04a2
--- /dev/null
+++ b/android_weather_app/.gitignore
@@ -0,0 +1,4 @@
+.gradle/
+build/
+app/build/
+local.properties
diff --git a/android_weather_app/app/build.gradle b/android_weather_app/app/build.gradle
new file mode 100644
index 0000000..33740ec
--- /dev/null
+++ b/android_weather_app/app/build.gradle
@@ -0,0 +1,36 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.example.weatherapp'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "com.example.weatherapp"
+        minSdk 24
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.9.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.recyclerview:recyclerview:1.3.1'
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
+}
diff --git a/android_weather_app/app/src/main/AndroidManifest.xml b/android_weather_app/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..5ac0729
--- /dev/null
+++ b/android_weather_app/app/src/main/AndroidManifest.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <application
+        android:label="Weather App"
+        android:theme="@style/Theme.WeatherApp">
+        <activity android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/android_weather_app/app/src/main/java/com/example/weatherapp/Hourly.java b/android_weather_app/app/src/main/java/com/example/weatherapp/Hourly.java
new file mode 100644
index 0000000..5039b1a
--- /dev/null
+++ b/android_weather_app/app/src/main/java/com/example/weatherapp/Hourly.java
@@ -0,0 +1,13 @@
+package com.example.weatherapp;
+
+import java.util.List;
+import com.google.gson.annotations.SerializedName;
+
+public class Hourly {
+    private List<String> time;
+    @SerializedName("temperature_2m")
+    private List<Double> temperature2m;
+
+    public List<String> getTime() { return time; }
+    public List<Double> getTemperature2m() { return temperature2m; }
+}
diff --git a/android_weather_app/app/src/main/java/com/example/weatherapp/MainActivity.java b/android_weather_app/app/src/main/java/com/example/weatherapp/MainActivity.java
new file mode 100644
index 0000000..c5f25c5
--- /dev/null
+++ b/android_weather_app/app/src/main/java/com/example/weatherapp/MainActivity.java
@@ -0,0 +1,70 @@
+package com.example.weatherapp;
+
+import android.os.Bundle;
+import android.util.Log;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import java.util.List;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+public class MainActivity extends AppCompatActivity {
+
+    private RecyclerView recyclerView;
+    private WeatherAdapter adapter;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        recyclerView = findViewById(R.id.recycler_view);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+
+        fetchWeather();
+    }
+
+    private void fetchWeather() {
+        Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl("https://api.open-meteo.com/")
+                .addConverterFactory(GsonConverterFactory.create())
+                .build();
+
+        WeatherService service = retrofit.create(WeatherService.class);
+
+        Call<List<WeatherResponse>> call = service.getForecast(
+                "37.3861,37.4419",
+                "-122.0839,-122.1430",
+                "temperature_2m",
+                "America/Los_Angeles"
+        );
+
+        call.enqueue(new Callback<List<WeatherResponse>>() {
+            @Override
+            public void onResponse(Call<List<WeatherResponse>> call, Response<List<WeatherResponse>> response) {
+                if (response.isSuccessful() && response.body() != null && response.body().size() >= 2) {
+                    WeatherResponse mvData = response.body().get(0);
+                    WeatherResponse paData = response.body().get(1);
+
+                    List<String> times = mvData.getHourly().getTime();
+                    List<Double> tempsMV = mvData.getHourly().getTemperature2m();
+                    List<Double> tempsPA = paData.getHourly().getTemperature2m();
+
+                    adapter = new WeatherAdapter(times, tempsMV, tempsPA);
+                    recyclerView.setAdapter(adapter);
+                } else {
+                    Log.e("WeatherApp", "Response unsuccessful or empty");
+                }
+            }
+
+            @Override
+            public void onFailure(Call<List<WeatherResponse>> call, Throwable t) {
+                Log.e("WeatherApp", "API Call failed", t);
+            }
+        });
+    }
+}
diff --git a/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherAdapter.java b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherAdapter.java
new file mode 100644
index 0000000..65acbe2
--- /dev/null
+++ b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherAdapter.java
@@ -0,0 +1,69 @@
+package com.example.weatherapp;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+import java.util.List;
+
+public class WeatherAdapter extends RecyclerView.Adapter<WeatherAdapter.ViewHolder> {
+
+    private List<String> times;
+    private List<Double> tempsMV;
+    private List<Double> tempsPA;
+
+    public WeatherAdapter(List<String> times, List<Double> tempsMV, List<Double> tempsPA) {
+        this.times = times;
+        this.tempsMV = tempsMV;
+        this.tempsPA = tempsPA;
+    }
+
+    @NonNull
+    @Override
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_weather, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
+        String time = times.get(position);
+        if (time.contains("T")) {
+            time = time.split("T")[1];
+        }
+
+        holder.tvTime.setText(time);
+
+        if (position < tempsMV.size()) {
+            holder.tvMvTemp.setText(String.format("%.1f°C", tempsMV.get(position)));
+        } else {
+            holder.tvMvTemp.setText("");
+        }
+
+        if (position < tempsPA.size()) {
+            holder.tvPaTemp.setText(String.format("%.1f°C", tempsPA.get(position)));
+        } else {
+            holder.tvPaTemp.setText("");
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return times != null ? times.size() : 0;
+    }
+
+    static class ViewHolder extends RecyclerView.ViewHolder {
+        TextView tvTime;
+        TextView tvMvTemp;
+        TextView tvPaTemp;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            tvTime = itemView.findViewById(R.id.tv_time);
+            tvMvTemp = itemView.findViewById(R.id.tv_mv_temp);
+            tvPaTemp = itemView.findViewById(R.id.tv_pa_temp);
+        }
+    }
+}
diff --git a/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherResponse.java b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherResponse.java
new file mode 100644
index 0000000..202e616
--- /dev/null
+++ b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherResponse.java
@@ -0,0 +1,11 @@
+package com.example.weatherapp;
+
+public class WeatherResponse {
+    private double latitude;
+    private double longitude;
+    private Hourly hourly;
+
+    public double getLatitude() { return latitude; }
+    public double getLongitude() { return longitude; }
+    public Hourly getHourly() { return hourly; }
+}
diff --git a/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherService.java b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherService.java
new file mode 100644
index 0000000..22257ac
--- /dev/null
+++ b/android_weather_app/app/src/main/java/com/example/weatherapp/WeatherService.java
@@ -0,0 +1,16 @@
+package com.example.weatherapp;
+
+import java.util.List;
+import retrofit2.Call;
+import retrofit2.http.GET;
+import retrofit2.http.Query;
+
+public interface WeatherService {
+    @GET("v1/forecast")
+    Call<List<WeatherResponse>> getForecast(
+        @Query("latitude") String latitude,
+        @Query("longitude") String longitude,
+        @Query("hourly") String hourly,
+        @Query("timezone") String timezone
+    );
+}
diff --git a/android_weather_app/app/src/main/res/layout/activity_main.xml b/android_weather_app/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..8a0d028
--- /dev/null
+++ b/android_weather_app/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/black">
+
+    <TextView
+        android:id="@+id/tv_header"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="Weather Forecast"
+        android:textColor="@color/white"
+        android:textSize="24sp"
+        android:textStyle="bold"
+        android:padding="16dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <LinearLayout
+        android:id="@+id/header_row"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:padding="16dp"
+        android:background="@color/dark_gray"
+        app:layout_constraintTop_toBottomOf="@id/tv_header"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent">
+         <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Time"
+            android:textColor="@color/white"
+            android:textStyle="bold"/>
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Mtn View"
+            android:textColor="@color/white"
+            android:gravity="end"
+            android:textStyle="bold"/>
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Palo Alto"
+            android:textColor="@color/white"
+            android:gravity="end"
+            android:textStyle="bold"/>
+    </LinearLayout>
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recycler_view"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@id/header_row"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/android_weather_app/app/src/main/res/layout/item_weather.xml b/android_weather_app/app/src/main/res/layout/item_weather.xml
new file mode 100644
index 0000000..5b952c9
--- /dev/null
+++ b/android_weather_app/app/src/main/res/layout/item_weather.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:padding="16dp"
+    android:background="@color/black">
+
+    <TextView
+        android:id="@+id/tv_time"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:text="Time"
+        android:textColor="@color/white"
+        android:textSize="16sp" />
+
+    <TextView
+        android:id="@+id/tv_mv_temp"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:text="MV"
+        android:textColor="@color/light_gray"
+        android:textSize="16sp"
+        android:gravity="end"/>
+
+    <TextView
+        android:id="@+id/tv_pa_temp"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:text="PA"
+        android:textColor="@color/light_gray"
+        android:textSize="16sp"
+        android:gravity="end"/>
+
+</LinearLayout>
diff --git a/android_weather_app/app/src/main/res/values/colors.xml b/android_weather_app/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..fe9bad5
--- /dev/null
+++ b/android_weather_app/app/src/main/res/values/colors.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+    <color name="dark_gray">#FF333333</color>
+    <color name="light_gray">#FFCCCCCC</color>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+</resources>
diff --git a/android_weather_app/app/src/main/res/values/styles.xml b/android_weather_app/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000..4e61d29
--- /dev/null
+++ b/android_weather_app/app/src/main/res/values/styles.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.WeatherApp" parent="Theme.AppCompat.NoActionBar">
+        <item name="colorPrimary">@color/black</item>
+        <item name="colorPrimaryDark">@color/black</item>
+        <item name="colorAccent">@color/white</item>
+        <item name="android:statusBarColor">@color/black</item>
+        <item name="android:windowBackground">@color/black</item>
+    </style>
+</resources>
diff --git a/android_weather_app/build.gradle b/android_weather_app/build.gradle
new file mode 100644
index 0000000..252492e
--- /dev/null
+++ b/android_weather_app/build.gradle
@@ -0,0 +1,20 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.1.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
diff --git a/android_weather_app/gradle.properties b/android_weather_app/gradle.properties
new file mode 100644
index 0000000..5bac8ac
--- /dev/null
+++ b/android_weather_app/gradle.properties
@@ -0,0 +1 @@
+android.useAndroidX=true
diff --git a/android_weather_app/settings.gradle b/android_weather_app/settings.gradle
new file mode 100644
index 0000000..e7b4def
--- /dev/null
+++ b/android_weather_app/settings.gradle
@@ -0,0 +1 @@
+include ':app'