Android Drawable的用法.docx

Android 2D 绘图-Drawable类的用法一 从项目资源来创建图像1. Java程序代码内使用方法建立窗体布局代码：public class MDrawableActivity extends Activity Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); LinearLayout mLinearLayout = new LinearLayout(this); ImageView mImageView = new ImageView(this); mImageView.setImageResource(R.drawable.baxinhua); mImageView.setAdjustViewBounds(true); mImageView.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); mLinearLayout.addView(mImageView); setContentView(mLinearLayout); 2. 通过Resources 类来获得项目资源Resources res = getResources();Drawable drawable = res.getDrawable(R.drawable.xxx);二 从XML文件来定义图像1) 可在XML文件定义的绘图子类绘图子类XML文件内的标签名称AnimationDrawable(动画绘图)BitmapDrawable(图像绘图)ClipDrawble(剪切绘图)ColorDrawable(色彩绘图)GradientDrawable(斜度绘图)InsetDrawable(插入绘图)(层次绘图)LevelListDrawableRotateDrawable(旋转绘图)ScaleDrawable(缩放绘图)StateListDrawableTransitionDrawable(过度绘图)2)定义图像的xml文件（以TransitionDrawable为例）代码：public class TransitionDrawableActivity extends Activity Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.main);Resources res = getResources();TransitionDrawable transition = (TransitionDrawable)res.getDrawable(R.drawable.transition_image);/图片自动从第一张慢慢淡化到第二张。ImageView mImageView = (ImageView)findViewById(R.id.mImageView);mImageView.setImageDrawable(transition);transition.startTransition(5*1000);2) 自定义View对象public class MShapeDrawable extends View private ShapeDrawable mShapDrawable;public MShapeDrawable(Context context) super(context);int x = 10;int y = 10;int width = 300;int height = 50;mShapDrawable = new ShapeDrawable(new OvalShape();mShapDrawable.getPaint().setColor(0xff74AC23);mShapDrawable.setBounds(x ,y , x+width, y+height);protected void onDraw(Canvas canvas) mShapDrawable.draw(canvas);然后在Activity里面显示public class ShapDrawableActivity extends Activity Overridepublic void onCreate(Bundle savedInstanceState)super.onCreate(sa