Added simple file browser functionality used when there are no applications installed to handle this task.

android/AndroidManifest.xml

@@ -77,6 +77,7 @@
             android:label="@string/MotorListTitle" />
         <activity android:name=".android.simulation.SimulationViewer" />
         <activity android:name=".android.simulation.GraphicalActivity" />
-    </application>
+        <activity android:name=".android.filebrowser.SimpleFileBrowser" />
+        </application>
 
 </manifest>

android/res/layout/simplefilebrowser.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/path"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content" />
+
+    <ListView
+        android:id="@android:id/list"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content" />
+
+    <TextView
+        android:id="@android:id/empty"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:text="No Data" />
+
+</LinearLayout>

android/src/net/sf/openrocket/android/Main.java

@@ -1,13 +1,14 @@
 package net.sf.openrocket.android;
 
 import net.sf.openrocket.R;
+import net.sf.openrocket.android.filebrowser.SimpleFileBrowser;
 import net.sf.openrocket.android.motor.MotorHierarchicalBrowser;
 import android.app.Activity;
+import android.content.ActivityNotFoundException;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.view.View;
-import android.view.Window;
 
 public class Main extends Activity {
 
@@ -39,9 +40,15 @@ public class Main extends Activity {
 	}
 
 	public void pickOrkFiles( View v ) {
-		Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
-		intent.setType("file/*");
-		startActivityForResult(intent,PICK_ORK_FILE_RESULT);
+		try {
+			Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
+			intent.setType("file/*");
+			startActivityForResult(intent,PICK_ORK_FILE_RESULT);
+		} catch ( ActivityNotFoundException ex ) { 
+			// No activity for ACTION_GET_CONTENT  use internal file browser
+			Intent intent = new Intent(Main.this, SimpleFileBrowser.class);
+			startActivityForResult(intent,PICK_ORK_FILE_RESULT);
+		}
 	}
 
 	public void browseMotors( View v ) {

android/src/net/sf/openrocket/android/filebrowser/SimpleFileBrowser.java

@@ -0,0 +1,146 @@
+package net.sf.openrocket.android.filebrowser;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.text.Collator;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
+
+import net.sf.openrocket.R;
+import android.app.AlertDialog;
+import android.app.ListActivity;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Environment;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.TextView;
+
+public class SimpleFileBrowser extends ListActivity {
+
+	private List<String> item = null;
+	private List<String> path = null;
+	private String root = "/";
+	private TextView myPath;
+
+	private static final OrkFileFilter filter = new OrkFileFilter();
+	private static final Collator sorter = Collator.getInstance();
+	static {
+		sorter.setStrength(Collator.TERTIARY);
+		sorter.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
+	}
+
+	/** Called when the activity is first created. */
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.simplefilebrowser);
+		myPath = (TextView) findViewById(R.id.path);
+		getDir(	Environment.getExternalStorageDirectory().getAbsolutePath() );
+	}
+
+	private static class OrkFileFilter implements FileFilter {
+
+		/* (non-Javadoc)
+		 * @see java.io.FileFilter#accept(java.io.File)
+		 */
+		@Override
+		public boolean accept(File arg0) {
+			if ( arg0.isDirectory() ) { 
+				return true;
+			}
+			if ( arg0.getName().endsWith(".ork") ) {
+				return true;
+			}
+			return false;
+		}
+
+	}
+
+	private static class FileComparator implements Comparator<File> {
+
+		/* (non-Javadoc)
+		 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
+		 */
+		@Override
+		public int compare(File arg0, File arg1) {
+			// Directories come before files, otherwise alpha.
+			if ( arg0.isDirectory() ) {
+				if ( ! arg1.isDirectory() ) {
+					return -1;
+				}
+				return sorter.compare(arg0.getName(), arg1.getName());
+			}
+
+			// arg0 is not a directory.
+			if ( arg1.isDirectory() ) {
+				return 1;
+			}
+
+			return sorter.compare(arg0.getName(), arg1.getName());
+		}
+
+	}
+
+	private void getDir(String dirPath) {
+		myPath.setText("Location: " + dirPath);
+		item = new ArrayList<String>();
+		path = new ArrayList<String>();
+
+		File f = new File(dirPath);
+		File[] files = f.listFiles(filter);
+
+		if (!dirPath.equals(root)) {
+			item.add(root);
+			path.add(root);
+			item.add("../");
+			path.add(f.getParent());
+		}
+
+		Arrays.sort(files, new FileComparator() );
+		for (int i = 0; i < files.length; i++) {
+			File file = files[i];
+			path.add(file.getPath());
+			if (file.isDirectory())
+				item.add(file.getName() + "/");
+			else
+				item.add(file.getName());
+		}
+
+		ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, item);
+		setListAdapter(fileList);
+
+	}
+
+	@Override
+	protected void onListItemClick(ListView l, View v, int position, long id) {
+		final File file = new File(path.get(position));
+		if (file.isDirectory()) {
+			if (file.canRead())
+				getDir(path.get(position));
+			else {
+				new AlertDialog.Builder(this).setIcon(R.drawable.or_launcher)
+				.setTitle("[" + file.getName() + "] folder can't be read!")
+				.setPositiveButton("OK",
+						new DialogInterface.OnClickListener() {
+					@Override
+					public void onClick(DialogInterface dialog, int which) {
+						// TODO Auto-generated method stub
+					}
+				}).show();
+			}
+		}
+		else
+		{
+			Intent resultData = new Intent(Intent.ACTION_VIEW);
+			resultData.setData( Uri.fromFile(file) );
+			setResult(RESULT_OK,resultData);
+			finish();
+		}
+	}
+}