Android Open Source - drawings Draw Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.dma.drawings;
// www. j  a  v  a 2s .  c om
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import android.os.Bundle;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class DrawActivity extends Activity 
implements OnTouchListener,SurfaceHolder.Callback  {

  
  
  private static final int DELAY   = 30;
  
  /**The SurfaceView to draw on.*/
  private  SurfaceView drawView;
  
  /** The surfaceview holder to draw to*/
  private SurfaceHolder holder;
  
  /**The background color.*/
  private int background;
  
  /**A thread use for drawing.*/
  
  private Paint paint;
  private Path path;
  private ArrayList<Path> arrayOfPaths;
  private ArrayList<Paint> arrayOfPaints;
  private Timer drawTimer;
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    setContentView(R.layout.activity_draw); 
    this.background = Color.WHITE;
    this.drawView = (SurfaceView) this.findViewById(R.string.DRAW_VIEW);
    this.drawView.setOnTouchListener(this);

    this.paint = new Paint();
    this.paint.setColor(Color.RED);
    this.paint.setAntiAlias(true);
    this.paint.setStrokeCap(Paint.Cap.ROUND);
    this.paint.setStyle(Paint.Style.STROKE);
    this.paint.setStrokeWidth(30);
    this.path = new Path();
    this.arrayOfPaths = new ArrayList<Path>();
    this.arrayOfPaints = new ArrayList<Paint>();
    
  }
  
  @Override
  protected void onResume() {
    super.onResume();
    this.drawView.getHolder().addCallback(this);
    this.startTimer();
  }
  
  protected void onPause() {
    super.onPause();
    this.stopTimer();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.draw, menu);
    return true;
  }
  
  
  public boolean onOptionsItemSelected(MenuItem item) {
    
    int c = Color.TRANSPARENT;
     if (item.getItemId() == R.id.Red) {
       c = Color.RED;
     }
     else if (item.getItemId() == R.id.Green) {
       c = Color.GREEN;
     }
     else if (item.getItemId() == R.id.blue) {
       c = Color.BLUE;
     }
     
     
     if (c != this.paint.getColor()) {
       this.arrayOfPaths.add(this.path);
       this.path = new Path();
       this.arrayOfPaints.add(new Paint(this.paint));
       this.paint.setColor(c);
     }  
     return true;
  }

  @Override
  public boolean onTouch(View v, MotionEvent event) {
    
    
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
      this.path.moveTo(event.getX(), event.getY());
    }
    else  {
      this.path.lineTo(event.getX(), event.getY());
    }
    
    return true;
  }

  @Override
  public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
    // TODO Auto-generated method stub
    
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    this.holder = holder;
    Canvas c = this.holder.lockCanvas();
    c.drawColor(this.background);
    holder.unlockCanvasAndPost(c);
    
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub
    
  }

  private void stopTimer() {
    
    if (this.drawTimer != null) {
      this.drawTimer.cancel();
      this.drawTimer.purge();
      this.drawTimer = null;
      
    }
    
  }
  
  private void startTimer() {
    
    if (this.drawTimer != null) {
      this.stopTimer();
    }
      this.drawTimer = new Timer();
      this.drawTimer.schedule(new DrawTask(), 0, DELAY);
    
    
    
  }
  
  protected class DrawTask extends TimerTask {

    @Override
    public void run() {
      
      
      if (holder != null) {
      
        Canvas c = holder.lockCanvas();
        if (c != null) {
          c.drawColor(background);
      
        for (int i = 0; i < arrayOfPaints.size(); i++) {
          c.drawPath(arrayOfPaths.get(i), arrayOfPaints.get(i));
        }
      
          c.drawPath(path, paint);
          holder.unlockCanvasAndPost(c);
        }
      }
    }
  }

}

Java Source Code List

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