Android自定义控件与特效

.,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.javapublicclassDefineViewextendsviewoveridepublicvoidondraw(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,newintColor.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();elsematrix.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.length1);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(PowerManage