Rotating spheres sample

samples/android/src/org/dartlang/example/dart/DartActivity.java

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package org.dartlang.example.dart;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+import android.app.Activity;
+import android.content.res.AssetManager;
+import android.opengl.GLES20;
+import android.opengl.GLSurfaceView;
+import android.opengl.GLSurfaceView.Renderer;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+import android.widget.EditText;
+import android.widget.TextView;
+ 
+import org.dartlang.Dart;
+ 
+
+public class DartActivity extends Activity
+{
+    /** The OpenGL view */
+    private GLSurfaceView glSurfaceView;
+
+    private static final String TAG = "DartActivity";
+    private static int sDartIsolate;
+
+    class GlRenderer implements Renderer {
+       @Override
+       public void onDrawFrame(GL10 gl) {
+           DartActivity.this.callDart("draw", new String[] {});
+       }
+
+       @Override
+       public void onSurfaceChanged(GL10 gl, int width, int height) {
+           Log.i(TAG, "onSurfaceChanged: [" + width + ", " + height + "]");
+           DartActivity.this.callDart("resize", new Object[] {width, height});
+       }
+
+       @Override
+       public void onSurfaceCreated(GL10 gl, EGLConfig config) {
+           Log.w(TAG, "Calling start");
+           ensureDartStarted();
+           DartActivity.this.callDart("setup", new Object[] {});
+       }
+    }
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+       super.onCreate(savedInstanceState);
+
+       requestWindowFeature(Window.FEATURE_NO_TITLE);
+       getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
+       glSurfaceView = new GLSurfaceView(this);
+       // Create an OpenGL ES 2.0 context
+       glSurfaceView.setEGLContextClientVersion(2);
+       glSurfaceView.setRenderer(new GlRenderer());
+       // Render the view only when there is a change in the drawing data
+       // glSurfaceView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
+
+       setContentView(glSurfaceView);
+    }
+
+    public void ensureDartStarted() {
+        if (sDartIsolate == 0) {
+            try {
+                String scriptPath = unpackAssets();
+                startDartVM(scriptPath + "/simplegl.dart");
+            } catch(Exception e) {
+                Log.e(TAG, "Could not start DartVM ", e);
+                throw new RuntimeException("Could not start DartVM", e);
+            }
+        }
+    }
+
+    private String unpackAssets() throws IOException {
+        File localDir = getApplicationContext().getDir("dart", 0);
+        String fileSystemPath = localDir.toString();
+        copyAssets("dart", fileSystemPath);
+        return fileSystemPath;
+    }
+
+    private void copyAssets(String assetPath, String fileSystemPath)
+            throws IOException {
+        AssetManager assetManager = getAssets();
+        String[] files = assetManager.list(assetPath);
+        for (String filename : files) {
+            InputStream in = null;
+            OutputStream out = null;
+            in = assetManager.open(assetPath + "/" + filename);
+            String dest = fileSystemPath + "/" + filename;
+            Log.w(TAG, "Copying " + dest);
+            out = new FileOutputStream(dest);
+            copyFile(in, out);
+            in.close();
+            in = null;
+            out.flush();
+            ((FileOutputStream)out).getFD().sync();
+            out.close();
+            out = null;
+        }
+    }
+
+    private void copyFile(InputStream in, OutputStream out) throws IOException {
+        byte[] buffer = new byte[1024];
+        int read;
+        while((read = in.read(buffer)) != -1){
+          out.write(buffer, 0, read);
+        }
+    }
+
+    private void startDartVM(final String scriptPath) {
+        String[] args = new String[]{
+          "dart", scriptPath
+        };
+        sDartIsolate = Dart.dartStart(args);
+        if (sDartIsolate == 0) {
+          Log.e(TAG, "Could not start Dart VM");
+          throw new RuntimeException("Error starting Dart VM");
+        }
+    }
+
+    private Object callDart(String function, Object[] args) {
+        if (sDartIsolate == 0) {
+          throw new RuntimeException("No isolate.");
+        }
+        Dart.EnterIsolate(sDartIsolate);
+        Dart.EnterScope();
+        try {
+            // Lookup the library of the root script.
+            int library = Dart.RootLibrary();
+            if (Dart.IsNull(library)) {
+              throw new RuntimeException("Unable to find root library.");
+            }
+            int[] dartArgs = new int[args.length];
+            for (int i = 0; i < args.length; i++) {
+                if (args[i] instanceof String) {
+                    dartArgs[i] = Dart.NewString((String) args[i]);
+                } else {
+                    Integer arg = (Integer) args[i];
+                    dartArgs[i] = Dart.NewInteger(arg.intValue());
+                }
+            }
+            Log.i(TAG, "Calling: " + function);
+            int result = Dart.Invoke(library, Dart.NewString(function), dartArgs);
+            if (Dart.IsError(result)) {
+              String error = Dart.GetError(result);
+              Log.w(TAG, "Error: " + error);
+              return "Dart.Invoke error: " + error;
+            }
+            return result;
+        } catch (Exception e) {
+            Log.w(TAG, "Exception: " + e);
+            return "Error";
+        } finally {
+          Dart.ExitScope();
+          Dart.ExitIsolate();
+        }
+    }
+}