osg for android (一) 简单几何物体的加载与显示

• 1. 首先需要一个OSG for android的环境.
  
• (1).NDK 现在Eclipse 对NDK已经相当友好了，已经不需要另外cygwin的参与，具体可以参考
• Android NDK开发篇(一)：新版NDK环境搭建(免Cygwin，超级快) 
• (2).osg for android的编译，参考 osg for android学习之一：windows下编译(亲测通过) 建议编译OpenGL ES2版本.
• 2.然后加载OSG自带的Example：osgAndroidExampleGLES2
•  
  (1)点击菜单键加载文件路径，输入/sdcard/osg/cow.osg(必须先往sdcard创建文件夹osg并把cow.osg放到该文件夹里边)                                                                                           

(2)接着经典的牛出现了:)     

3.自带的example太多的代码，这样的代码无论对于NDK的初学者或OSG很不直观，所以本人重写了一个HelloWolrd for osg的例子。例子很简单，就是简单加载一个四边形并附上颜色。

(1)Java 代码：

(1)Java 代码： 
package com.example.helloosg;
import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

	private GLSurfaceView mGLSurfaceView;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mGLSurfaceView = new GLSurfaceView(this);
		mGLSurfaceView.setEGLContextClientVersion(2);
		NDKRenderer renderer = new NDKRenderer();
		this.mGLSurfaceView.setRenderer(renderer);
		this.setContentView(mGLSurfaceView);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
		mGLSurfaceView.onResume();
	}

	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		mGLSurfaceView.onPause();
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}