Android 简单图形绘制-优快云博客

本文介绍了一个使用Android Studio开发的简单示例应用，展示了如何在界面上绘制一个矩形。通过自定义视图类`Draw`，利用ShapeDrawable和Canvas实现矩形绘制，并设置了颜色和边界。此教程适合初学者了解Android绘图的基本概念。

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绘制一个矩形

package rw.Draw; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Rect; import android.graphics.Shader; import android.graphics.drawable.ShapeDrawable; import android.graphics.drawable.shapes.RectShape; import android.os.Bundle; import android.util.AttributeSet; import android.view.View; public class Drwa02Activity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Draw draw=new Draw(this); setContentView(draw); } public class Draw extends View{ private ShapeDrawable shapeDrawable;//ShapeDrawable继承来自Drawable类，可以随便绘制二维图形 public Draw(Context context) { super(context); // TODO Auto-generated constructor stub shapeDrawable=new ShapeDrawable(new RectShape()); shapeDrawable.getPaint().setColor(Color.RED); shapeDrawable.setBounds(20, 20, 400, 200); //shapeDrawable.setBounds(left, top, right, bottom); } protected void onDraw(Canvas canvas){ shapeDrawable.draw(canvas); } } }