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Add Chaquopy to Android
1 parent 17871d7 commit 583e1eb

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+123
-3
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4 files changed

+123
-3
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‎apps/android_pythonnative/app/build.gradle‎

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
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plugins {
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id 'com.android.application'
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id 'org.jetbrains.kotlin.android'
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id 'com.chaquo.python'
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}
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android {
@@ -18,6 +19,15 @@ android {
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vectorDrawables {
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useSupportLibrary true
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}
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ndk {
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abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
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}
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python {
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pip {
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install "matplotlib"
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}
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}
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}
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buildTypes {

‎apps/android_pythonnative/app/src/main/java/com/pythonnative/pythonnative/MainActivity.kt‎

Lines changed: 98 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -12,23 +12,52 @@ import androidx.compose.ui.Modifier
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import androidx.compose.ui.tooling.preview.Preview
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import com.pythonnative.pythonnative.ui.theme.PythonnativeTheme
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import android.graphics.BitmapFactory
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import android.widget.Toast
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import androidx.compose.foundation.Image
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.wrapContentHeight
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import androidx.compose.material3.ExperimentalMaterial3Api
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import androidx.compose.material3.OutlinedTextField
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import androidx.compose.runtime.*
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import androidx.compose.ui.graphics.asImageBitmap
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import androidx.compose.ui.layout.ContentScale
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.unit.dp
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import com.chaquo.python.PyException
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import com.chaquo.python.Python
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import com.chaquo.python.android.AndroidPlatform
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import androidx.compose.material3.Button
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import androidx.compose.material3.Text
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import androidx.compose.ui.ExperimentalComposeUiApi
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import androidx.compose.ui.platform.LocalSoftwareKeyboardController
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class MainActivity : ComponentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContent {
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PythonnativeTheme {
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// A surface container using the 'background' color from the theme
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Surface(
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modifier = Modifier.fillMaxSize(),
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color = MaterialTheme.colorScheme.background
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) {
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Greeting("Android")
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MainScreen()
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}
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}
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}
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}
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}
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@Composable
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fun Greeting(name: String, modifier: Modifier = Modifier) {
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Text(
@@ -43,4 +72,70 @@ fun GreetingPreview() {
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PythonnativeTheme {
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Greeting("Android")
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}
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}
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}
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@OptIn(ExperimentalMaterial3Api::class, ExperimentalComposeUiApi::class)
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@Composable
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fun MainScreen() {
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val context = LocalContext.current
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var bitmap by remember { mutableStateOf<android.graphics.Bitmap?>(null) }
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val coroutineScope = rememberCoroutineScope()
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// Initialize Chaquopy
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if (!Python.isStarted()) {
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Python.start(AndroidPlatform(context))
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}
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val py = Python.getInstance()
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val plotModule = py.getModule("plot")
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// Variables to keep the user's input
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var xInput by remember { mutableStateOf("") }
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var yInput by remember { mutableStateOf("") }
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val keyboardController = LocalSoftwareKeyboardController.current
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Column(
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modifier = Modifier.padding(16.dp),
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verticalArrangement = Arrangement.spacedBy(16.dp)
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) {
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OutlinedTextField(
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value = xInput,
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onValueChange = { xInput = it },
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label = { Text("Input X") }
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)
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OutlinedTextField(
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value = yInput,
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onValueChange = { yInput = it },
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label = { Text("Input Y") }
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)
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Button(onClick = {
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coroutineScope.launch {
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try {
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val bytes = plotModule.callAttr(
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"plot",
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xInput,
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yInput
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).toJava(ByteArray::class.java)
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withContext(Dispatchers.IO) {
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bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.size)
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}
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} catch (e: PyException) {
123+
Toast.makeText(context, e.message, Toast.LENGTH_LONG).show()
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}
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keyboardController?.hide()
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}
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}) {
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Text(text = "Generate Plot")
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}
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bitmap?.let {
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Image(
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bitmap = it.asImageBitmap(),
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contentDescription = "Generated plot",
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modifier = Modifier
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.fillMaxWidth()
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.wrapContentHeight(),
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contentScale = ContentScale.FillWidth
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)
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}
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}
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}

‎apps/android_pythonnative/app/src/main/python/plot.py‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,14 @@
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import io
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import matplotlib.pyplot as plt
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5+
def plot(x, y):
6+
xa = [float(word) for word in x.split()]
7+
ya = [float(word) for word in y.split()]
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fig, ax = plt.subplots()
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ax.plot(xa, ya)
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f = io.BytesIO()
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plt.savefig(f, format="png")
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return f.getvalue()

‎apps/android_pythonnative/build.gradle‎

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Original file line numberDiff line numberDiff line change
@@ -3,4 +3,5 @@ plugins {
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id 'com.android.application' version '8.0.2' apply false
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id 'com.android.library' version '8.0.2' apply false
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id 'org.jetbrains.kotlin.android' version '1.7.20' apply false
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id 'com.chaquo.python' version '14.0.2' apply false
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}

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