Android自定义控件与特效.ppt

Android自定义控件与特效 吴坤庭 自定义属性 Attrs xmlmain xmlmain javaTypedArraya context obtainStyledAttributes attrs R styleable mainView 0 0 contentW a getInt R styleable mainView contentWidth 0 自定义view main xmlDefineview javapublicclassDefineViewextendsview overidepublicvoidondraw Canvascavas 动态广告栏控件 Handler的使用handler sendMessageDelayed handler obtainMessage refreshTime 隔一段时间发个消息到达动画的效果 时钟控件 ListviewlistView setOnScrollListener newOnScrollListener OverridepublicvoidonScroll AbsListViewv intfirstVisibleItem intvisibleItemCount inttotalItemCount OverridepublicvoidonScrollStateChanged AbsListViewview intscrollState 闪烁特效控件 shader newLinearGradient 0 0 200 0 newint Color RED Color GREEN Color BLUE null TileMode MIRROR mTxtPaint setShader shader OverrideprotectedvoidonDraw Canvascanvas longnow System currentTimeMillis floatelapsed now lastTime 4 5f dx elapsed Matrixmatrix newMatrix if start matrix setTranslate dx 0 invalidate else matrix setTranslate 0 0 shader setLocalMatrix matrix 图片浏览特效控件 倒影算法通过重写Gallery的getChildStaticTransformation 实现图片间切换的效果 Listview顺序移动控件 mWindowManager WindowManager mContext getSystemService window mWindowManager addView v mWindowParams privateTouchInterceptor DragListenermDragListener newTouchInterceptor DragListener publicvoiddrag intfrom intto mAdapter notifyDataSetChanged mListView invalidateViews 更多 DockbarSlidebar svn 192 168 9 119 Android CommonCode 特效 matrix setPolyToPoly src 0 dst 0 src length 1 比如伪3D立体效果canvas drawVertices Canvas VertexMode TRIANGLE FAN 6 mVertsShadow2 0 mTexsShadow2 0 null 0 null 0 0 mPaintShadow1 比如翻书特效 对特效的一些想法 JNI调用 运行时执行效率高 但要注意从Java层到C层会生成副本 Opengl图片大小有限制 Animation缺点就是无法控制过程自定义动画 通过不断地渲染达到动画 短信widgets ViewgroupprotectedvoiddispatchDraw Canvascanvas protectedvoidonLayout booleanchanged intl intt intr intb Handler控制动画 常驻服务 PowerManagerpm PowerManager context getSystemService Context POWER SERVICE mStartingService pm newWakeLock Power