Android公告条Demo，NoticeViewDemo

package com.aitsuki.noticeviewdemo; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Paint; 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.View; import android.view.animation.AlphaAnimation; import android.view.animation.AnimationSet; import android.view.animation.TranslateAnimation; import android.widget.FrameLayout; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * Created by AItsuki on 2016/1/18. */ public class NoticeView extends FrameLayout implements View.OnClickListener { private final long DEFAULT_ANIMATION_DURATION = 1000; // 动画时长 private final long DEFAULT_NOTICE_SPACE = 3000; // 公告切换时长 private final int DEFAULT_TEXT_COLOR = 0xff000000; // 默认字体颜色 private long mNoticeDuration = DEFAULT_NOTICE_SPACE; private int mTextColor = DEFAULT_TEXT_COLOR; private float mTextSize; private LayoutParams mLayoutParams; private List<TextView> mNoticeList; private int mCurrentNotice; private AnimationSet mEnterAnimSet; private AnimationSet mExitAnimSet; private Handler mHandler = new Handler(Looper.getMainLooper()); private NoticeRunnable mNoticeRunnalbe; private OnItemClickListener mListener; private TextPaint textPaint; public NoticeView(Context context) { this(context, null); } public NoticeView(Context context, AttributeSet attrs) { super(context, attrs); TypedArray array = getContext().obtainStyledAttributes(attrs, R.styleable.NoticeView); mTextColor = array.getColor(R.styleable.NoticeView_textColor, DEFAULT_TEXT_COLOR); mTextSize = array.getDimension(R.styleable.NoticeView_textSize, mTextSize); array.recycle(); // 初始化动画 createExitAnimation(); createEnterAnimation(); // 初始化一个画笔，用于测量高度 textPaint = new TextPaint(); } @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) { textPaint.setTextSize(mTextSize); Paint.FontMetrics fontMetrics = textPaint.getFontMetrics(); exceptHeight = (int) (fontMetrics.bottom - fontMetrics.top); } } int width = resolveSize(exceptWidth, widthMeasureSpec); int height = resolveSize(exceptHeight, heightMeasureSpec); setMeasuredDimension(width, height); } 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(DEFAULT_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(DEFAULT_ANIMATION_DURATION); } /** * 设置公告的集合 * @param list */ public void setNoticeList(List<String> list) { // 设置集合的时候，要将上一次的集合清除。 if(list == null || list.size() ==0) { return; } removeAllViews(); if(mNoticeList == null) { mNoticeList = new ArrayList<>(); } mNoticeList.clear(); // 创建TextView for (int i=0; i< list.size(); i++) { TextView textView = createTextView(list.get(i)); mNoticeList.add(textView); addView(textView); } mCurrentNotice = 0; mNoticeList.get(mCurrentNotice).setVisibility(VISIBLE); } /** * 设置条目点击侦听 * @param listener */ public void setOnItemClickListener(OnItemClickListener listener) { setOnClickListener(this); mListener = listener; } /** * 设置公告的切换间隔 * @param duration */ public void setNoticeDuration(long duration) { if(duration > 0) { mNoticeDuration = duration; } } /** * 设置默认动画的时长 * @param duration */ public void setAnimationDuration(long duration) { if(duration > 0) { if(mEnterAnimSet != null) { mEnterAnimSet.setDuration(duration); } if(mExitAnimSet != null) { mExitAnimSet.setDuration(duration); } } } /** * @param animation */ public void setEnterAnimation(AnimationSet animation) { mEnterAnimSet = animation; } /** * 设置公告的退出动画 * @param animation */ public void setExitAnimation(AnimationSet animation) { mExitAnimSet = animation; } /** * 开始循环播放公告 * 推荐和pause()配合在生命周期中使用 */ public void start() { if(mNoticeRunnalbe == null) { mNoticeRunnalbe = new NoticeRunnable(); } else { mHandler.removeCallbacks(mNoticeRunnalbe); } mHandler.postDelayed(mNoticeRunnalbe, mNoticeDuration); } /** * 暂停循环播放公告 * 推荐和start()配合在生命周期中使用 */ public void pause() { if(mNoticeRunnalbe!= null) { mHandler.removeCallbacks(mNoticeRunnalbe); } } /** * TextView默认水平居中， singline， invisible * @param text * @return */ private TextView createTextView(String text) { if (mLayoutParams == null) { mLayoutParams = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); mLayoutParams.gravity = Gravity.CENTER_VERTICAL; } TextView textView = new TextView(getContext()); textView.setLayoutParams(mLayoutParams); textView.setSingleLine(); textView.setEllipsize(TextUtils.TruncateAt.END); textView.setTextColor(mTextColor); textView.setVisibility(INVISIBLE); textView.setText(text); // 如果有设置字体大小，如果字体大小为null。 if (mTextSize > 0) { textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,mTextSize); } return textView; } @Override public void onClick(View v) { if(mListener != null && mNoticeList!= null && mNoticeList.size() >0) { mListener.onItemClick(mNoticeList.get(mCurrentNotice),mCurrentNotice); } } /** * * 动