Check if Android device has a file browser when importing data

android-project/app/src/main/AndroidManifest.xml

@@ -3,6 +3,14 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:installLocation="auto">
 
+	<!-- Detect if device has a file browser -->
+	<queries>
+		<intent>
+			<action android:name="android.intent.action.OPEN_DOCUMENT" />
+			<data android:mimeType="*/*" />
+		</intent>
+	</queries>
+
     <!-- OpenGL ES 2.0 -->
     <uses-feature android:glEsVersion="0x00020000" />
 

android-project/app/src/main/java/org/diasurgical/devilutionx/ImportActivity.java

@@ -3,15 +3,23 @@ package org.diasurgical.devilutionx;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.ClipData;
+import android.content.ComponentName;
 import android.content.ContentResolver;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Build;
 import android.support.annotation.Nullable;
 import android.os.Bundle;
 import android.support.annotation.RequiresApi;
 import android.support.v4.provider.DocumentFile;
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.method.LinkMovementMethod;
+import android.text.style.URLSpan;
 import android.util.Log;
+import android.view.View;
+import android.widget.TextView;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -19,11 +27,13 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.ArrayList;
-import java.util.Objects;
 
 public class ImportActivity extends Activity {
 
 	private static final int IMPORT_REQUEST_CODE = 0xD1AB70;
+	private static final String TV_STUB_PACKAGE = "com.android.tv.frameworkpackagestubs";
+	private static final String RECOMMENDED_FILE_BROWSER = "AnExplorer";
+	private static final String RECOMMENDED_FILE_BROWSER_PACKAGE = "dev.dworks.apps.anexplorer";
 	private boolean userConfirmed = false;
 
 	@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@@ -31,25 +41,11 @@ public class ImportActivity extends Activity {
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		ExternalFilesManager fileManager = new ExternalFilesManager(this);
+		if (findFileBrowser()) {
-		String externalFilesDir =  fileManager.getExternalFilesDirectory();
+			runFileBrowser();
-
+		} else {
-		AlertDialog.Builder builder = new AlertDialog.Builder(this);
+			recommendFileBrowser();
-		builder.setMessage(getString(R.string.import_data_info, externalFilesDir));
+		}
-		builder.setPositiveButton(R.string.ok_button, (dialog, which) -> {
-			this.userConfirmed = true;
-			Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
-			intent.addCategory(Intent.CATEGORY_OPENABLE);
-			intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
-			intent.setType("*/*");
-			startActivityForResult(intent, IMPORT_REQUEST_CODE);
-		});
-		builder.setOnDismissListener(dialog -> {
-			if (!this.userConfirmed && !isFinishing()) finish();
-		});
-
-		AlertDialog dialog = builder.create();
-		dialog.show();
 	}
 
 	@Override
@@ -86,6 +82,81 @@ public class ImportActivity extends Activity {
 		}
 	}
 
+	private boolean findFileBrowser() {
+		Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+		intent.addCategory(Intent.CATEGORY_OPENABLE);
+		intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
+		intent.setType("*/*");
+
+		PackageManager packageManager = getPackageManager();
+		ComponentName defaultPackage = intent.resolveActivity(packageManager);
+		return defaultPackage != null && !TV_STUB_PACKAGE.equals(defaultPackage.getPackageName());
+	}
+
+	private void recommendFileBrowser()
+	{
+		String noFileBrowserText = getString(R.string.no_file_browser);
+		SpannableString message;
+
+		boolean isTelevision = getPackageManager().hasSystemFeature(PackageManager.FEATURE_LEANBACK);
+		if (isTelevision) {
+			String recommendation = getString(R.string.recommended_file_browser, RECOMMENDED_FILE_BROWSER);
+			String messageText = noFileBrowserText + " " + recommendation;
+			message = new SpannableString(messageText);
+
+			int index = messageText.indexOf(RECOMMENDED_FILE_BROWSER);
+			if (index >= 0) {
+				String url = "market://details?id=" + RECOMMENDED_FILE_BROWSER_PACKAGE;
+				URLSpan urlSpan = new URLSpan(url);
+				message.setSpan(urlSpan, index, index + RECOMMENDED_FILE_BROWSER.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+			}
+		} else {
+			message = new SpannableString(noFileBrowserText);
+		}
+
+		AlertDialog.Builder builder = new AlertDialog.Builder(this);
+		builder.setMessage(message);
+		builder.setPositiveButton("OK", null);
+		builder.setOnDismissListener(dialog -> {
+			if (findFileBrowser()) {
+				runFileBrowser();
+			} else if (!isFinishing()) {
+				finish();
+			}
+		});
+
+		AlertDialog dialog = builder.create();
+		dialog.show();
+
+		View view = dialog.findViewById(android.R.id.message);
+		if (view instanceof TextView) {
+			TextView textView = (TextView)view;
+			textView.setMovementMethod(LinkMovementMethod.getInstance());
+		}
+	}
+
+	private void runFileBrowser() {
+		ExternalFilesManager fileManager = new ExternalFilesManager(this);
+		String externalFilesDir =  fileManager.getExternalFilesDirectory();
+
+		AlertDialog.Builder builder = new AlertDialog.Builder(this);
+		builder.setMessage(getString(R.string.import_data_info, externalFilesDir));
+		builder.setPositiveButton(R.string.ok_button, (dialog, which) -> {
+			userConfirmed = true;
+			Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+			intent.addCategory(Intent.CATEGORY_OPENABLE);
+			intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
+			intent.setType("*/*");
+			startActivityForResult(intent, IMPORT_REQUEST_CODE);
+		});
+		builder.setOnDismissListener(dialog -> {
+			if (!userConfirmed && !isFinishing()) finish();
+		});
+
+		AlertDialog dialog = builder.create();
+		dialog.show();
+	}
+
 	private ArrayList<Uri> getItemUris(ClipData clipData) {
 		ArrayList<Uri> uriList = new ArrayList<>();
 		if (clipData == null)

android-project/app/src/main/res/values/strings.xml

@@ -13,6 +13,8 @@
 	<string name="shareware_data">Diablo Demo Data</string>
 	<string name="import_short_label">Import Data</string>
 	<string name="gamepad_tv_text">This game requires a gamepad to play</string>
+	<string name="no_file_browser">Please install a file explorer to select the files you want to import.</string>
+	<string name="recommended_file_browser">For Android TV, we recommend %1$s.</string>
 	<string name="import_data_info">On the next screen, select files that will be imported into:\n\n%1$s</string>
 	<string name="overwrite_query">The following files will be overwritten. Is this okay?\n\n%1$s</string>
 	<string name="ok_button">OK</string>