项目中需要用到类似公告栏的控件，能用的基本不支持多行显示，于是只好自己动手，苦于没有自定义过一个像样的控件，借鉴Android公告条demo，实现了多行向上滚动的控件。在原控件基础之上添加如下功能：•传入数据分页显示•添加Left Drawable•手指触摸事件处理•添加3D动画翻滚效果
效果图
源码
package com.android.view;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Camera;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.drawable.Drawable;import android.os.Handler;import android.os.Looper;import android.text.TextPaint;import android.text.TextUtils;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.AccelerateInterpolator;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationSet;import android.view.animation.Transformation;import android.view.animation.TranslateAnimation;import android.widget.FrameLayout;import android.widget.LinearLayout;import android.widget.TextView;import com.sd2w.market.client.R;import java.util.ArrayList;import java.util.List;import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;/** * 公告滚动区 * * @author 祁连山 * @version 1.0 * @date 2016-08-17 */public class RollingView extends FrameLayout implements OnClickListener { // 默认动画执行时间 private static final int ANIMATION_DURATION = 1000; // 延迟滚动时间间隔 private long mDuration = 3000; // 字体颜色 private int mTextColor = 0xff000000; // 点击后字体颜色 private int mClickColor = 0xff0099ff; // 字体大小 private float mTextSize = 14; // 行间距 private int mTextPadding = 10; // 画笔 private Paint mPaint; // 默认每页信息数 private int mPageSize = 3; // 最后一页余数 private int mUpLimited = mPageSize; // 当前显示页码 private int mCurrentPage = 0; // 总分页数 private int mPageCount; // 左图片 private int mLeftDrawable; // 分页数据对象 private List<LinearLayout> mRollingPages; // 默认动画 private AnimationSet mEnterAnimSet; private AnimationSet mExitAnimSet; private RollingRunnable mRunnable; private Handler mHandler; private onItemClickListener mClickListener; // 布局参数 private LayoutParams mFrameParams; private LinearLayout.LayoutParams mLinearParams; //mEnterDownAnim,mOutUp分别构成向下翻页的进出动画 private Rotate3dAnimation mEnterDownAnim; private Rotate3dAnimation mExitUpAnim; //mEnterUpAnim,mOutDown分别构成向下翻页的进出动画 private Rotate3dAnimation mEnterUpAnim; private Rotate3dAnimation mExitDownAnim; public RollingView(Context context) { this(context, null); } public RollingView(Context context, AttributeSet attrs) { super(context, attrs); // 从xml中获取属性 TypedArray array = getContext().obtainStyledAttributes(attrs, R.styleable.RollingView); mTextSize = array.getDimension(R.styleable.RollingView_textSize, mTextSize); mTextColor = array.getColor(R.styleable.RollingView_textColor, mTextColor); array.recycle(); // 创建默认显示隐藏动画 createEnterAnimation(); createExitAnimation(); // 初始化画笔 mPaint = new TextPaint(); // 初始化Handler对象 mHandler = new Handler(Looper.getMainLooper()); mEnterDownAnim = createAnim(-90, 0, true, true); mExitUpAnim = createAnim(0, 90, false, true); mEnterUpAnim = createAnim(90, 0, true, false); mExitDownAnim = createAnim(0, -90, false, false); } private Rotate3dAnimation createAnim(float start, float end, boolean turnIn, boolean turnUp) { final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end, turnIn, turnUp); rotation.setDuration(300); rotation.setFillAfter(false); rotation.setInterpolator(new AccelerateInterpolator()); return rotation; } /** * 设置分页大小 * * @param pageSize */ public void setPageSize(int pageSize) { this.mPageSize = this.mUpLimited = pageSize; } /** * 设置延迟时间 * * @param millionSeconds */ public void setDelayedDuration(long millionSeconds) { this.mDuration = millionSeconds; } /** * 设置显示动画 * * @param animation */ public void setEnterAnimation(AnimationSet animation) { mEnterAnimSet = animation; } /** * 设置隐藏动画 * * @param animation */ public void setExitAnimation(AnimationSet animation) { mExitAnimSet = animation; } /** * 设置行距 * * @param padding */ public void setTextPadding(int padding) { this.mTextPadding = padding; } /** * 设置点击后字体颜色 * * @param color */ public void setClickColor(int color) { this.mClickColor = color; } /** * 设置左图片 * * @param drawable */ public void setLeftDrawable(int drawable) { this.mLeftDrawable = drawable; } /** * 设置点击事件 * * @param clickListener */ public void setOnItemClickListener(onItemClickListener clickListener) { if (null == clickListener) return; this.mClickListener = clickListener; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 如果是未指定大小，那么设置宽为300px int exceptWidth = 300; int exceptHeight = 0; // 计算高度，如果将高度设置为textSize会很丑，因为文字有默认的上下边距。 if (MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY) { if (mTextSize > 0) { mPaint.setTextSize(mTextSize); Paint.FontMetrics fontMetrics = mPaint.getFontMetrics(); exceptHeight = (int) (fontMetrics.bottom - fontMetrics.top); } } int width = resolveSize(exceptWidth, widthMeasureSpec); int height = resolveSize(exceptHeight, heightMeasureSpec); setMeasuredDimension(width, height); } public void setRollingText(List<String> array) { if (null == array || array.isEmpty()) return; this.removeAllViews(); if (mRollingPages == null) { mRollingPages = new ArrayList<>(); } mRollingPages.clear(); // 计算商数 int quotient = array.size() / mPageSize; // 计算余数 int remainder = array.size() % mPageSize; // 计算需要创建多少页 mPageCount = remainder == 0 ? quotient : quotient + 1; for (int i = 0; i < mPageCount; i++) { // 创建一个布局 LinearLayout container = createContainer(); if (i == mPageCount - 1) { mUpLimited = remainder == 0 ? mPageSize : remainder; } for (int n = 0; n < mUpLimited; n++) { TextView textView = createTextView(array.get(mPageSize * i + n)); container.addView(textView); } // 添加到分页中 mRollingPages.add(container); this.addView(container); } // 初始化显示第一页 mCurrentPage = 0; mRollingPages.get(mCurrentPage).setVisibility(VISIBLE); this.setVisibility(mRollingPages.get(mCurrentPage)); } /** * 创建页对象 * * @return */ private LinearLayout createContainer() { if (mFrameParams == null) { mFrameParams = new LayoutParams(MATCH_PARENT, WRAP_CONTENT); mFrameParams.gravity = Gravity.CENTER_VERTICAL; } LinearLayout container = new LinearLayout(getContext()); container.setLayoutParams(mFrameParams); container.setOrientation(LinearLayout.VERTICAL); return container; } private void setVisibility(LinearLayout container) { int count = container.getChildCount(); for (int i = 0; i < count; i++) { container.getChildAt(i).setVisibility(VISIBLE); } } /** * 创建页内容对象 * * @param text * @return */ private TextView createTextView(String text) { if (mLinearParams == null) { mLinearParams = new LinearLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT); mLinearParams.gravity = Gravity.CENTER_VERTICAL; } TextView textView = new TextView(getContext()); textView.setLayoutParams(mLinearParams); textView.setSingleLine(); textView.setPadding(mTextPadding, mTextPadding, mTextPadding, mTextPadding); textView.setEllipsize(TextUtils.TruncateAt.END); textView.setTextColor(mTextColor); textView.setVisibility(INVISIBLE); textView.setText(text); if (mLeftDrawable > 0) { Drawable drawable = getContext().getResources().getDrawable(mLeftDrawable); // Bitmap bitmap = BitmapFactory.decodeResource(getContext().getResources(), mLeftDrawable); // Drawable drawable = new BitmapDrawable(getContext().getResources(), bitmap); drawable.setBounds(0, 0, 10, 10); textView.setCompoundDrawablePadding(10); textView.setCompoundDrawables(drawable, null, null, null); } textView.setOnClickListener(this); // 设置字体大小 if (mTextSize > 0) { textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize); } return textView; } private void createEnterAnimation() { mEnterAnimSet = new AnimationSet(false); TranslateAnimation translateAnimation = new TranslateAnimation(0, 0, 0, 0, TranslateAnimation.RELATIVE_TO_PARENT, 1f, TranslateAnimation.RELATIVE_TO_SELF, 0f); AlphaAnimation alphaAnimation = new AlphaAnimation(0f, 1f); mEnterAnimSet.addAnimation(translateAnimation); mEnterAnimSet.addAnimation(alphaAnimation); mEnterAnimSet.setDuration(ANIMATION_DURATION); } private void createExitAnimation() { mExitAnimSet = new AnimationSet(false); TranslateAnimation translateAnimation = new TranslateAnimation(0, 0, 0, 0, TranslateAnimation.RELATIVE_TO_SELF, 0f, TranslateAnimation.RELATIVE_TO_PARENT, -1f); AlphaAnimation alphaAnimation = new AlphaAnimation(1f, 0f); mExitAnimSet.addAnimation(translateAnimation); mExitAnimSet.addAnimation(alphaAnimation); mExitAnimSet.setDuration(ANIMATION_DURATION); } @Override public boolean onTouchEvent(MotionEvent event) { int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: pause(); break; case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: resume(); break; } return true; } public void resume() { // 只有一页时不进行切换 if (mPageCount < 1) return; if (mRunnable == null) { mRunnable = new RollingRunnable(); } else { mHandler.removeCallbacks(mRunnable); } mHandler.postDelayed(mRunnable, mDuration); } public void pause() { if (mRunnable != null) { mHandler.removeCallbacks(mRunnable); } } @Override public void onClick(View v) { if (null == mClickListener) return; TextView textView = (TextView) v; mClickListener.onItemClick(textView); textView.setTextColor(mClickColor); } /** * 隐藏当前页,显示下一页任务 */ public class RollingRunnable implements Runnable { @Override public void run() { // 隐藏当前页 LinearLayout currentView = mRollingPages.get(mCurrentPage); currentView.setVisibility(INVISIBLE); if (mExitAnimSet != null) { currentView.startAnimation(mExitAnimSet);// mExitUpAnim); } mCurrentPage++; if (mCurrentPage >= mPageCount) { mCurrentPage = 0; } // 显示下一页 LinearLayout nextView = mRollingPages.get(mCurrentPage); nextView.setVisibility(VISIBLE); setVisibility(nextView); if (mEnterAnimSet != null) { nextView.startAnimation(mEnterAnimSet);// mEnterDownAnim); } mHandler.postDelayed(this, mDuration); } } public class Rotate3dAnimation extends Animation { private final float mFromDegrees; private final float mToDegrees; private final boolean mTurnIn; private final boolean mTurnUp; private float mCenterX; private float mCenterY; private Camera mCamera; public Rotate3dAnimation(float fromDegrees, float toDegrees, boolean turnIn, boolean turnUp) { mFromDegrees = fromDegrees; mToDegrees = toDegrees; mTurnIn = turnIn; mTurnUp = turnUp; } @Override public void initialize(int width, int height, int parentWidth, int parentHeight) { super.initialize(width, height, parentWidth, parentHeight); mCamera = new Camera(); mCenterY = getHeight() / 2; mCenterX = getWidth() / 2; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { final float fromDegrees = mFromDegrees; float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime); final float centerX = mCenterX; final float centerY = mCenterY; final Camera camera = mCamera; final int derection = mTurnUp ? 1 : -1; final Matrix matrix = t.getMatrix(); camera.save(); if (mTurnIn) { camera.translate(0.0f, derection * mCenterY * (interpolatedTime - 1.0f), 0.0f); } else { camera.translate(0.0f, derection * mCenterY * (interpolatedTime), 0.0f); } camera.rotateX(degrees); camera.getMatrix(matrix); camera.restore(); matrix.preTranslate(-centerX, -centerY); matrix.postTranslate(centerX, centerY); } } public interface onItemClickListener { void onItemClick(TextView v); }}
使用
// 初始化号外列表List<String> haowaiArray = new ArrayList<>();haowaiArray.add("[母婴天地] 买尿不湿送婴儿手口湿巾");haowaiArray.add("[利民商店] 满100免费配送");haowaiArray.add("[果之家] 泰国金枕榴莲8元/kg");haowaiArray.add("[户外运动] 户外运动专业装备搜集");haowaiArray.add("[天天特价] 只要9.9还包邮");haowaiArray.add("[尖端潮品] 折叠电动车");haowaiArray.add("[黑科技] 智能VR带你装13");haowaiArray.add("[旅行必备] 太阳能充电宝-永不断电");// 绑定数据mRollingView.setPageSize(4);mRollingView.setClickColor(0xff888888);mRollingView.setLeftDrawable(R.drawable.drawable_red_dot);mRollingView.setRollingText(haowaiArray);mRollingView.setOnItemClickListener(this);...@Overridepublic void onItemClick(TextView v) { // handle item click event}@Overridepublic void onResume() { super.onResume(); mRollingView.resume();}@Overridepublic void onPause() { super.onPause(); mRollingView.pause();}
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既有美妙的风景，也会有称不上景只有风的地方。
