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Tuesday, 7 August 2012

Create Options Menu with SurfaceView


Create Options Menu with SurfaceView

To create Options Menu on SurfaceView, simple override onCreateOptionsMenu() to add menu options, and override onOptionsItemSelected() to handle the event.

Create Options Menu with SurfaceView

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package com.TestSurefaceView;
 
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
 
public class TestSurefaceView extends Activity {
  
 MySurfaceView mySurfaceView;
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mySurfaceView = new MySurfaceView(this);
        setContentView(mySurfaceView);
    }
     
    @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  mySurfaceView.onResumeMySurfaceView();
 }
 
 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  mySurfaceView.onPauseMySurfaceView();
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // TODO Auto-generated method stub
  menu.add(0, 0, 0, "Do Something");
  menu.add(0, 1, 1, "Do Something Else");
  return true;
 }
 
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
  switch(item.getItemId()){
  case 0:
   Toast.makeText(TestSurefaceView.this,
     "Do Something",
     Toast.LENGTH_LONG).show();
   break;
  case 1:
   Toast.makeText(TestSurefaceView.this,
     "Do Something Else",
     Toast.LENGTH_LONG).show();
   break;
  }
  return true;
 }
 
 class MySurfaceView extends SurfaceView implements Runnable{
   
  //In this test, handle maximum of 2 pointer
  final int MAX_POINT_CNT = 2;
   
  private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  float[] x = new float[MAX_POINT_CNT];
  float[] y = new float[MAX_POINT_CNT];
  boolean[] isTouch = new boolean[MAX_POINT_CNT];
   
  float[] x_last = new float[MAX_POINT_CNT];
  float[] y_last = new float[MAX_POINT_CNT];
  boolean[] isTouch_last = new boolean[MAX_POINT_CNT];
 
      
     Thread thread = null;
     SurfaceHolder surfaceHolder;
     volatile boolean running = false;
      
     volatile boolean touched = false;
     volatile float touched_x, touched_y;
 
  public MySurfaceView(Context context) {
   super(context);
   // TODO Auto-generated constructor stub
   surfaceHolder = getHolder();
 
  }
   
  public void onResumeMySurfaceView(){
   running = true;
   thread = new Thread(this);
   thread.start();
  }
   
  public void onPauseMySurfaceView(){
   boolean retry = true;
   running = false;
   while(retry){
    try {
     thread.join();
     retry = false;
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
 
  @Override
  public void run() {
   // TODO Auto-generated method stub
   while(running){
    if(surfaceHolder.getSurface().isValid()){
     Canvas canvas = surfaceHolder.lockCanvas();
     //... actual drawing on canvas
 
     paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(1);
      
     if(isTouch[0]){
      if(isTouch_last[0]){
       paint.setStyle(Paint.Style.STROKE);
          paint.setStrokeWidth(5);
          paint.setColor(Color.RED);
          canvas.drawLine(x_last[0], y_last[0], x[0], y[0], paint);
      }
     }
     if(isTouch[1]){
      if(isTouch_last[1]){
       paint.setStyle(Paint.Style.STROKE);
          paint.setStrokeWidth(5);
          paint.setColor(Color.BLUE);
          canvas.drawLine(x_last[1], y_last[1], x[1], y[1], paint);
      }
     }
      
     surfaceHolder.unlockCanvasAndPost(canvas);
    }
   }
  }
 
  @Override
  public boolean onTouchEvent(MotionEvent motionEvent) {
   int pointerIndex = ((motionEvent.getAction() & MotionEvent.ACTION_POINTER_ID_MASK)
     >> MotionEvent.ACTION_POINTER_ID_SHIFT);
   int pointerId = motionEvent.getPointerId(pointerIndex);
   int action = (motionEvent.getAction() & MotionEvent.ACTION_MASK);
   int pointCnt = motionEvent.getPointerCount();
    
   if (pointCnt <= MAX_POINT_CNT){
    if (pointerIndex <= MAX_POINT_CNT - 1){
 
     for (int i = 0; i < pointCnt; i++) {
      int id = motionEvent.getPointerId(i);
      x_last[id] = x[id];
      y_last[id] = y[id];
      isTouch_last[id] = isTouch[id];
      x[id] = motionEvent.getX(i);
      y[id] = motionEvent.getY(i);
      }
      
     switch (action){
     case MotionEvent.ACTION_DOWN:
      isTouch[pointerId] = true;
      break;
     case MotionEvent.ACTION_POINTER_DOWN:
      isTouch[pointerId] = true;
      break;
     case MotionEvent.ACTION_MOVE:
      isTouch[pointerId] = true;
      break;
     case MotionEvent.ACTION_UP:
      isTouch[pointerId] = false;
      isTouch_last[pointerId] = false;
      break;
     case MotionEvent.ACTION_POINTER_UP:
      isTouch[pointerId] = false;
      isTouch_last[pointerId] = false;
      break;
     case MotionEvent.ACTION_CANCEL:
      isTouch[pointerId] = false;
      isTouch_last[pointerId] = false;
      break;
     default:
      isTouch[pointerId] = false;
      isTouch_last[pointerId] = false;
     }
    }
   }
    
   return true;
  }
      
    }
}


akm
www.cdacians.com
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