Added some functionality to Main activity. Splash screen is displayed for a little bit, then the user is presented with two buttons - one to open a file browser to find ork files, the other to start the motor browser.

android/res/layout/main.xml

@@ -0,0 +1,31 @@
+<?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" >
+
+    <ImageView
+        android:id="@+id/splashscreen"
+        android:layout_width="wrap_content"
+        android:layout_height="fill_parent"
+        android:layout_gravity="center"
+        android:src="@drawable/splashscreen" />
+
+    <TextView
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:text="Welcome to OpenRocket" />
+
+    <Button
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:onClick="pickOrkFiles"
+        android:text="View ork file" />
+
+    <Button
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:onClick="browseMotors"
+        android:text="View motors" />
+
+</LinearLayout>

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

@@ -1,7 +1,81 @@
 package net.sf.openrocket.android;
 
+import net.sf.openrocket.R;
+import net.sf.openrocket.android.motor.MotorHierarchicalBrowser;
 import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.view.View;
+import android.widget.ImageView;
 
 public class Main extends Activity {
 
+	private static final int PICK_ORK_FILE_RESULT = 1;
+
+	private static final int STOPSPLASH = 0;
+	//time in milliseconds
+	private static final long SPLASHTIME = 3000;
+
+	private ImageView splash;
+
+	//handler for splash screen
+	private Handler splashHandler = new Handler() {
+		/* (non-Javadoc)
+		 * @see android.os.Handler#handleMessage(android.os.Message)
+		 */
+		@Override
+		public void handleMessage(Message msg) {
+			switch (msg.what) {
+			case STOPSPLASH:
+				//remove SplashScreen from view
+				splash.setVisibility(View.GONE);
+				break;
+			}
+			super.handleMessage(msg);
+		}
+	};
+
+	/** Called when the activity is first created. */
+	@Override
+	public void onCreate(Bundle icicle) {
+		super.onCreate(icicle);
+		setContentView(R.layout.main);
+		splash = (ImageView) findViewById(R.id.splashscreen);
+		Message msg = new Message();
+		msg.what = STOPSPLASH;
+		splashHandler.sendMessageDelayed(msg, SPLASHTIME);
+	}
+
+	/* (non-Javadoc)
+	 * @see android.app.Activity#onActivityResult(int, int, android.content.Intent)
+	 */
+	@Override
+	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+		switch ( requestCode ) {
+		case PICK_ORK_FILE_RESULT:
+			if(resultCode==RESULT_OK){
+				Uri file = data.getData();
+				Intent intent = new Intent(Intent.ACTION_VIEW);
+				intent.setData(file);
+				startActivity(intent);
+			}
+			break;
+		}
+		super.onActivityResult(requestCode, resultCode, data);
+	}
+
+	public void pickOrkFiles( View v ) {
+		Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
+		intent.setType("file/*");
+		startActivityForResult(intent,PICK_ORK_FILE_RESULT);
+	}
+
+	public void browseMotors( View v ) {
+		Intent i = new Intent(Main.this, MotorHierarchicalBrowser.class);
+		startActivity(i);
+	}
+
 }