android : fix permission

examples/llama.android/app/src/main/AndroidManifest.xml

@@ -3,6 +3,8 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
     <application
         android:allowBackup="true"

examples/llama.android/app/src/main/java/com/example/llama/MainActivity.kt

@@ -4,6 +4,7 @@ import android.app.ActivityManager
 import android.app.DownloadManager
 import android.content.ClipData
 import android.content.ClipboardManager
+import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Bundle
 import android.os.StrictMode
@@ -29,6 +30,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 import androidx.core.content.getSystemService
 import com.example.llama.ui.theme.LlamaAndroidTheme
 import java.io.File
@@ -56,6 +59,19 @@ class MainActivity(
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        val permissionGranted = ContextCompat.checkSelfPermission(
+            this,
+            android.Manifest.permission.WRITE_EXTERNAL_STORAGE
+        ) == PackageManager.PERMISSION_GRANTED
+
+        if (!permissionGranted) {
+            ActivityCompat.requestPermissions(
+                this,
+                arrayOf(android.Manifest.permission.WRITE_EXTERNAL_STORAGE),
+                0
+            )
+        }
+
         StrictMode.setVmPolicy(
             VmPolicy.Builder(StrictMode.getVmPolicy())
                 .detectLeakedClosableObjects()
@@ -71,6 +87,11 @@ class MainActivity(
         val extFilesDir = getExternalFilesDir(null)
 
         val models = listOf(
+            Downloadable(
+                "Qwen2.5 0.5B (Q4_K_M, 429 MiB)",
+                Uri.parse("https://huggingface.co/Qwen/Qwen2.5-0.5B-Instruct-GGUF/resolve/main/qwen2.5-0.5b-instruct-q4_k_m.gguf?download=true"),
+                File(extFilesDir, "qwen2.5-0.5b-instruct-q4_k_m.gguf"),
+            ),
             Downloadable(
                 "Phi-2 7B (Q4_0, 1.6 GiB)",
                 Uri.parse("https://huggingface.co/ggml-org/models/resolve/main/phi-2/ggml-model-q4_0.gguf?download=true"),