Android.opengl.GLSurfaceView

private Bitmap createBitmapFromGLSurface(int x, int y, int w, int h, GL10 gl)
        throws OutOfMemoryError {
    int bitmapBuffer[] = new int[w * h];
    int bitmapSource[] = new int[w * h];
    IntBuffer intBuffer = IntBuffer.wrap(bitmapBuffer);
    intBuffer.position(0);

    try {
        gl.glReadPixels(x, y, w, h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, intBuffer);
        int offset1, offset2;
        for (int i = 0; i < h; i++) {
            offset1 = i * w;
            offset2 = (h - i - 1) * w;
            for (int j = 0; j < w; j++) {
                int texturePixel = bitmapBuffer[offset1 + j];
                int blue = (texturePixel >> 16) & 0xff;
                int red = (texturePixel << 16) & 0x00ff0000;
                int pixel = (texturePixel & 0xff00ff00) | red | blue;
                bitmapSource[offset2 + j] = pixel;
            }
        }
    } catch (GLException e) {
        return null;
    }

    return Bitmap.createBitmap(bitmapSource, w, h, Bitmap.Config.ARGB_8888);
}

setEGLConfigChooser(8, 8, 8, 8, 16, 0);
getHolder().setFormat(PixelFormat.TRANSLUCENT);

package com.example;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class JniCanvasTest extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MapView(getApplicationContext()));
    }

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

package com.example;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLSurfaceView;
import android.opengl.GLSurfaceView.Renderer;
import android.view.MotionEvent;
public class MapView extends GLSurfaceView implements Renderer {
    public MapView(Context context) {
        super(context);

        this.setRenderer(this);
        this.requestFocus();
        this.setRenderMode(RENDERMODE_WHEN_DIRTY);
        this.setFocusableInTouchMode(true);

//      try {
//          Thread.sleep(3000);
//      } catch (InterruptedException e) {
//          e.printStackTrace();
//      }
    }

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        // nativeCreated();
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        // nativeChanged(width, height);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        // nativeUpdate();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        requestRender();
        return super.onTouchEvent(event);
    }
}

setEGLContextClientVersion(2);
setRenderer(this);

// 화면갱신요청이 있을 때 까지 대기.
setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);

// 화면을 지속적으로 갱신.
// setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);
requestRender();