創建自定義的 GLSurfaceView，以處理用戶輸入

把前面的"GLSurfaceView 示例"修改, 創建自定義的GLSurfaceView，並實現onTouchEvent()函數, 便可以處理用戶輸入.

本例子中, 用戶在屏幕上移動手指, 畫面顏色會根據而改變.

AndroidGLSurfaceViewActivity.java

package com.AndroidGLSurfaceViewActivity;

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.MotionEvent;

public class AndroidGLSurfaceViewActivity extends Activity {
 
 private MyGLSurfaceView myGLSurfaceView;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Create our Preview view and set it as the content of our
        // Activity
        myGLSurfaceView = new MyGLSurfaceView(this);
        setContentView(myGLSurfaceView);
    }

 @Override
 protected void onResume() {

  super.onResume();
  myGLSurfaceView.onResume();
 }

 @Override
 protected void onPause() {

  super.onPause();
  myGLSurfaceView.onPause();
 }

 class MyGLSurfaceView extends GLSurfaceView{
  
  MyRenderer myRenderer;

  public MyGLSurfaceView(Context context) {
   super(context);
   // TODO Auto-generated constructor stub
         myRenderer = new MyRenderer();
         setRenderer(myRenderer);
  }

  @Override
  public boolean onTouchEvent(final MotionEvent event) {
   // TODO Auto-generated method stub
   queueEvent(new Runnable(){
    
    public void run() {
     myRenderer.setColor(event.getX()/getWidth(),
       event.getY()/getHeight(), 1.0f);
    }});
   return true;
  }
 }

}

MyRenderer.java

package com.AndroidGLSurfaceViewActivity;

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

public class MyRenderer implements android.opengl.GLSurfaceView.Renderer{

 private float red = 0;
    private float green = 0;
    private float blue = 0;

 @Override
 public void onDrawFrame(GL10 gl) {
  // TODO Auto-generated method stub
  gl.glClearColor(red, green, blue, 1.0f);
  gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
 }

 @Override
 public void onSurfaceChanged(GL10 arg0, int arg1, int arg2) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void onSurfaceCreated(GL10 arg0, EGLConfig arg1) {
  // TODO Auto-generated method stub
  
 }
 
 public void setColor(float r, float g, float b){
  red = r;
  green = g;
  blue = b;
 }

}