Android Project Ideas for Beginners (with Kotlin)

Android Project Ideas for Beginners (with Kotlin)

The fastest way to learn Android is to build small, complete apps and finish them. Below are ten project ideas ordered from easiest to most involved. Each one names the concepts it teaches (so you can pick based on what you want to practise) and there is a starter snippet at the end. Pick one, finish it, then move up the list.

Easy: Build Confidence

1. Tip Calculator. Enter a bill amount and a percentage, see the tip and total. Teaches: state, text input, simple arithmetic, recomposition. A perfect first app after a counter.

2. BMI Calculator. Enter height and weight, show the result with a label. Teaches: handling number input, validation, conditional UI.

3. Unit Converter. Convert between, say, kilometres and miles. Teaches: dropdown selection, formatting numbers, state that depends on two inputs.

4. Notes (in-memory). Add and remove short notes shown in a list. Teaches: LazyColumn, lists in state, add and delete actions. (Persistence comes next.)

Medium: Combine Concepts

5. Notes with Storage. Extend the notes app so notes survive restarts using Room. Teaches: local database, entities, DAOs, coroutines. See Local Storage in Android.

6. To-Do List with Multiple Screens. A list screen and an add/edit screen. Teaches: Navigation Compose, passing an ID between screens. See Activities and Navigation.

7. Quiz App. Show questions, track score, display a result screen. Teaches: managing more complex state, navigation, conditional flow.

Harder: Real-World Skills

8. Weather or Quotes App. Fetch data from a public REST API and display it. Teaches: networking with Retrofit, coroutines, error handling, loading states. See Calling an API in Android.

9. Photo Notes. Attach a camera photo to a note. Teaches: runtime permissions, the camera, combining storage with media. See Permissions in Android.

10. Expense Tracker. Add expenses by category, store them, show a monthly summary. Teaches: database with queries, lists, computed totals, multiple screens, the most "complete app" of the set.

A Starter Snippet: Tip Calculator Core

Here is the heart of project 1 to get you moving. It takes a bill and a tip percentage and computes the total reactively.

import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

@Composable
fun TipCalculator() {
    var bill by remember { mutableStateOf("") }   // raw text the user types
    val tipPercent = 10                            // fixed 10% for simplicity

    // toDoubleOrNull safely handles empty or invalid input
    val amount = bill.toDoubleOrNull() ?: 0.0
    val tip = amount * tipPercent / 100
    val total = amount + tip

    Column(modifier = Modifier.padding(16.dp)) {
        OutlinedTextField(
            value = bill,
            onValueChange = { bill = it }, // update state as the user types
            label = { Text("Bill amount") }
        )
        Text("Tip: $tip")     // recomputed whenever bill changes
        Text("Total: $total")
    }
}

Notice there is no "calculate" button: because bill is state, the totals recompute automatically as the user types. That reactive style is the Compose way.

How to Choose

• Just finished your first app? Start at 1 or 2.
• Comfortable with state and layouts? Jump to 5 or 6 to learn storage and navigation.
• Want something portfolio-worthy? Build 8 or 10; they combine the most skills.

Finish whatever you start. A small, polished, complete app teaches more than three half-built ambitious ones.

Common Mistakes

• Choosing a project far above your level. A huge social-media clone as a first project usually stalls. Build up the list.
• Never finishing. An incomplete app teaches little. Pick a small scope and ship it, even just to your own phone.
• Skipping error and empty states. Real apps handle empty lists, bad input, and failed network calls. Practise these early.
• Copying code without understanding it. Type it, change it, break it, and fix it. That is where learning happens.
• Ignoring the basics under pressure. If state behaves oddly, revisit remember and mutableStateOf rather than guessing.

FAQ

How long should a beginner project take? A few hours to a couple of evenings for the easy ones. If it drags on for weeks, the scope is too big.

Can I show these to prove my skills? Yes. A few finished apps that you can explain demonstrate real ability. Quality and your understanding matter more than quantity.

Do I need a server for these? Most do not. Projects 8 onward use existing public APIs; you do not have to build a backend.

Keep Going

Pick a project, then lean on the building blocks: Layouts and UI, Local Storage, and Calling an API. Want a structured path from idea to shipped app? See the Android Developer Roadmap and the Android learning hub.

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Want project feedback and a clear path? Join the waitlist for the Android Development course at Infoplanet in Jalgaon.