Android中自定义组件和自定义特效.ppt

1、自定义属性,Attrs.xml main.xml main.java TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.mainView, 0, 0); contentW = a.getInt(R.styleable.mainView_contentWidth, 0);,自定义view,main.xml Defineview.java public class DefineView extends view overide public void ondraw(Canvas cavas) ,动态广告栏控件,Hand

2、ler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,Listview listView.setOnScrollListener(new OnScrollListener() Override public void onScroll(AbsListView v, int firstVisibleItem, int visibleItemCount, int totalItemCount) ; Override public void onScrollState

3、Changed(AbsListView view, int scrollState) ; );,闪烁特效控件,shader = new LinearGradient(0, 0, 200, 0, new int Color.RED, Color.GREEN, Color.BLUE , null, TileMode.MIRROR); mTxtPaint.setShader(shader); Override protected void onDraw(Canvas canvas) long now = System.currentTimeMillis(); float elapsed = (now

4、 - lastTime) / 4.5f; dx += elapsed; Matrix matrix = new Matrix(); 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)m

5、Context.getSystemService(window); mWindowManager.addView(v, mWindowParams); private TouchInterceptor.DragListener mDragListener = new TouchInterceptor.DragListener() public void drag(int from, int to) mAdapter.notifyDataSetChanged(); mListView.invalidateViews(); ;,更多,Dockbar Slidebar . svn:/192.168.

6、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,Viewgroup protected void dispatchDraw(Canvas canvas) protected void onLayout(boolean changed, int l, int t, int r, int b) Handler 控制动画,常驻服务,PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE); mStartingService = pm.newWakeLock(PowerM