Android自定义组件与特效

Android自定义控件与特效

自定义属性

Attrs.xml<resources> <declare-styleable name="mainView"> <attr name="refreshTime" format="integer"/> <attr name="shadowHeight" format="integer"/> </declare-styleable> </resources>

main.xml<com.android.Effect.TribalFusion android:orientation="vertical" mainView:contentWidth="268" mainView:contentHeight="57" mainView:refreshTime="5000" mainView:shadowHeight="30" />

main.javaTypedArray a = context.obtainStyledAttributes(attrs, R.styleable.mainView, 0, 0); contentW = a.getInt(R.styleable.mainView_contentWidth, 0);

自定义viewmain.xml <defineview> </defineview> Defineview.java public class DefineView extends view { @overide public void ondraw(Canvas cavas) { } }

动态广告栏控件

Handler的使用 handler.sendMessageDelayed(handler.obtai nMessage(), 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 onScrollStateChanged(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 - 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)mContext.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://192.168.9.119/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.T RIANGLE_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 cha

nged, int l, int t, int r, int b) {} Handler 控制动画

常驻服务

PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_S ERVICE); mStartingService = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "StartingAlertService"); mStartingService.acquire(); …. mStartingService.release();

谢谢