FilePicker and basic zip handling

app/build.gradle.kts

@@ -29,11 +29,8 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
-    kotlinOptions {
-        jvmTarget = "11"
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
     }
     buildFeatures {
         compose = true
@@ -51,6 +48,8 @@ dependencies {
 
     ksp("androidx.room:room-compiler:$room_version")
 
+    implementation("io.github.chochanaresh:filepicker:0.6.0")
+
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.activity.compose)

app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt

@@ -92,8 +92,8 @@ fun Main(vm: TileViewModel = viewModel()) {
             Box(modifier = Modifier.safeDrawingPadding()
                 .align(Alignment.CenterEnd)
                 .rotate(-90F)
-                .size(240.dp, 40.dp)
-                .offset(0.dp, 80.dp)
+                .size(200.dp, 40.dp)
+                .offset(0.dp, 60.dp)
             ) {
                 Slider(
                     value = sliderValue.floatValue,

app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt

@@ -1,18 +1,66 @@
 package com.mirenkov.ktheightmap
 
 import android.os.Bundle
+import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.safeDrawingPadding
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
 import com.mirenkov.ktheightmap.ui.theme.KtHeightMapTheme
+import com.nareshchocha.filepickerlibrary.FilePickerResultContracts
+import com.nareshchocha.filepickerlibrary.models.PickerData
+import com.nareshchocha.filepickerlibrary.models.PopUpConfig
+import java.io.FileInputStream
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
 
 class SettingsActivity : ComponentActivity() {
         override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        val launcher = registerForActivityResult(FilePickerResultContracts.PickDocumentFile()) { result ->
+            if (result.errorMessage != null) {
+                Log.e("Picker", result.errorMessage ?: "")
+            } else {
+                val filePath = result.selectedFilePath
+                filePath?.let {
+                    if (!it.endsWith(".zip"))
+                        return@let
+                    ZipInputStream(FileInputStream(it)).use { zipInputStream ->
+                        var entry = zipInputStream.nextEntry
+                        while (entry != null) {
+                            with(entry.name) {
+                                if (count { it == '/' } == 4 && endsWith(".jpg"))
+                                    processEntry(entry)
+                            }
+                            entry = zipInputStream.nextEntry
+                        }
+                    }
+                }
+            }
+        }
         enableEdgeToEdge()
         setContent {
             KtHeightMapTheme {
+                Column(Modifier.fillMaxSize()
+                    .safeDrawingPadding()) {
+                        Button(onClick = {
+                            launcher.launch(null)
+                        }) { Text(text = "Load database") }
+                    }
+                }
             }
         }
     }
+}
+
+fun processEntry(entry: ZipEntry) {
+    Log.i(TAG, entry.name)
 }