建立一个简单的android涂鸦工程

为了测试一些别的算法，建立一个简单的涂鸦工程。

1. clipse建立一个android工程

建立一个简单的android涂鸦工程_第1张图片

按提示生成android工程，会生成一个的android文件，如下：

package com.mystroke;import android.app.Activity;import android.os.Bundle;public class MystrokeActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }}

2. 添加利用view来进行涂鸦的代码

在src下new一个class, 类命取为HandwritingView，生成一个空的类，如下：

在HandwritingView里添加代码如下（代码来源于http://blog.csdn.net/arui319/article/details/5870651）：

package com.mystroke;import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.graphics.Path;  import android.graphics.Paint.Style;  import android.view.MotionEvent;  import android.view.View;  /**  * Example for hand writing.  *   * @author http://blog.csdn.net/arui319  * @version 2010/09/07  *   */  public class HandwritingView extends View {      private Paint paint = null;      private Path path = null;      public HandwritingView(Context context) {          super(context);          path = new Path();          paint = new Paint();          paint.setColor(Color.YELLOW);          paint.setStyle(Style.STROKE);          paint.setAntiAlias(true);          this.setBackgroundColor(Color.BLACK);      }      @Override      public boolean onTouchEvent(MotionEvent event) {          if (event.getAction() == MotionEvent.ACTION_DOWN) {              int x = (int) event.getX();              int y = (int) event.getY();              path.moveTo(x, y);              invalidate();              return true;          } else if (event.getAction() == MotionEvent.ACTION_MOVE) {              int x = (int) event.getX();              int y = (int) event.getY();              path.lineTo(x, y);              invalidate();              return true;          }          return super.onTouchEvent(event);      }      @Override      protected void onDraw(Canvas canvas) {          super.onDraw(canvas);          if (path != null) {              canvas.drawPath(path, paint);          }      }  }

修改文件MystrokeActivity.java如下：

package com.mystroke;import android.app.Activity;import android.os.Bundle;public class MystrokeActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //setContentView(R.layout.main);        setContentView(new HandwritingView(this));    }}

跑工程，完成。

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