Fix download manager crashing in newer devices.

Request storage permission in Mashmallow until Pie. Also added support of
HTTPS URL.

love/src/main/java/org/love2d/android/DownloadActivity.java

@@ -1,24 +1,78 @@
 package org.love2d.android;
 
 import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.Manifest;
 import android.net.Uri;
 import android.os.Bundle;
+import android.util.Log;
+
+import androidx.core.app.ActivityCompat;
 
 public class DownloadActivity extends Activity {
+    public static final int EXTERNAL_STORAGE_REQUEST_CODE = 2;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        Uri uri = this.getIntent().getData();
+        if (android.os.Build.VERSION.SDK_INT >= 29 ||
+            ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
+        {
+            runDownloader();
+            finish();
+        } else {
+            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_REQUEST_CODE);
+        }
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
 
-        if (uri.getScheme().equals("http")) {
-            String url = uri.toString();
-            Intent intent = new Intent(this, DownloadService.class);
-            intent.putExtra("url", url);
-            startService(intent);
+        if (grantResults.length > 0) {
+            Log.d("DownloadActivity", "Received a request permission result");
+
+            if (requestCode == EXTERNAL_STORAGE_REQUEST_CODE) {
+                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    runDownloader();
+                    finish();
+                } else {
+                    Log.d("DownloadActivity", "Did not get permission.");
+                    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
+                        showExternalStoragePermissionMissingDialog();
+                    }
+                }
+            }
         }
+    }
 
-        finish();
+    protected void showExternalStoragePermissionMissingDialog() {
+        AlertDialog dialog = new AlertDialog.Builder(this)
+            .setTitle("Storage Permission Missing")
+            .setMessage("LÖVE for Android will not be able to download games without storage permission.")
+            .setNeutralButton("Continue", new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int whichButton) {
+                    dialog.dismiss();
+                    finish();
+                }
+            })
+            .create();
+        dialog.show();
+    }
+
+    protected void runDownloader()
+    {
+        Intent intent = getIntent();
+        
+        if (intent != null) {
+            Uri uri = intent.getData();
+            Intent targetIntent = new Intent(this, DownloadService.class);
+            targetIntent.putExtra("url", uri.toString());
+            startService(targetIntent);
+        }
     }
 }

love/src/main/java/org/love2d/android/DownloadService.java

@@ -33,9 +33,9 @@ public class DownloadService extends IntentService {
         String url = intent.getStringExtra("url");
         Uri uri = Uri.parse(url);
 
-        Log.d("DownloadService", "Downloading from url: " + url + "file = " + uri.getLastPathSegment());
+        Log.d("DownloadService", "Downloading from url: " + url + " file = " + uri.getLastPathSegment());
 
-        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
+        DownloadManager.Request request = new DownloadManager.Request(uri);
         request.setDescription("LÖVE Game Download");
         request.setTitle(uri.getLastPathSegment());
         request.setMimeType("application/x-love-game");