跑馬燈效果,大家可以去原作者瀏覽https://github.com/sfsheng0322/MarqueeView
下面看自定義控件的代碼
public class MarqueeView extends ViewFlipper { private Context mContext; private List<String> notices; private boolean isSetAnimDuration = false; private OnItemClickListener onItemClickListener; private int interval = 2000; private int animDuration = 500; private int textSize = 14; private int textColor = 0xffffffff; private int gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL; private static final int TEXT_GRAVITY_LEFT = 0, TEXT_GRAVITY_CENTER = 1, TEXT_GRAVITY_RIGHT = 2; public MarqueeView(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs, 0); } private void init(Context context, AttributeSet attrs, int defStyleAttr) { this.mContext = context; if (notices == null) { notices = new ArrayList<>(); } TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MarqueeViewStyle, defStyleAttr, 0); interval = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvInterval, interval); isSetAnimDuration = typedArray.hasValue(R.styleable.MarqueeViewStyle_mvAnimDuration); animDuration = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvAnimDuration, animDuration); if (typedArray.hasValue(R.styleable.MarqueeViewStyle_mvTextSize)) { textSize = (int) typedArray.getDimension(R.styleable.MarqueeViewStyle_mvTextSize, textSize); textSize = DisplayUtil.px2sp(mContext, textSize); } textColor = typedArray.getColor(R.styleable.MarqueeViewStyle_mvTextColor, textColor); int gravityType = typedArray.getInt(R.styleable.MarqueeViewStyle_mvGravity, TEXT_GRAVITY_LEFT); switch (gravityType) { case TEXT_GRAVITY_CENTER: gravity = Gravity.CENTER; break; case TEXT_GRAVITY_RIGHT: gravity = Gravity.RIGHT | Gravity.CENTER_VERTICAL; break; } typedArray.recycle(); setFlipInterval(interval); Animation animIn = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_in); if (isSetAnimDuration) animIn.setDuration(animDuration); setInAnimation(animIn); Animation animOut = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_out); if (isSetAnimDuration) animOut.setDuration(animDuration); setOutAnimation(animOut); } // 根據(jù)公告字符串啟動(dòng)輪播 public void startWithText(final String notice) { if (TextUtils.isEmpty(notice)) return; getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { getViewTreeObserver().removeGlobalOnLayoutListener(this); startWithFixedWidth(notice, getWidth()); } }); } // 根據(jù)公告字符串列表啟動(dòng)輪播 public void startWithList(List<String> notices) { setNotices(notices); start(); } // 根據(jù)寬度和公告字符串啟動(dòng)輪播 private void startWithFixedWidth(String notice, int width) { int noticeLength = notice.length(); int dpW = DisplayUtil.px2dip(mContext, width); int limit = dpW / textSize; if (dpW == 0) { throw new RuntimeException("Please set MarqueeView width !"); } if (noticeLength <= limit) { notices.add(notice); } else { int size = noticeLength / limit + (noticeLength % limit != 0 ? 1 : 0); for (int i = 0; i < size; i++) { int startIndex = i * limit; int endIndex = ((i + 1) * limit >= noticeLength ? noticeLength : (i + 1) * limit); notices.add(notice.substring(startIndex, endIndex)); } } start(); } // 啟動(dòng)輪播 public boolean start() { if (notices == null || notices.size() == 0) return false; removeAllViews(); for (int i = 0; i < notices.size(); i++) { final TextView textView = createTextView(notices.get(i), i); final int finalI = i; textView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (onItemClickListener != null) { onItemClickListener.onItemClick(finalI, textView); } } }); addView(textView); } if (notices.size() > 1) { startFlipping(); } return true; } // 創(chuàng)建ViewFlipper下的TextView private TextView createTextView(String text, int position) { TextView tv = new TextView(mContext); tv.setGravity(gravity); tv.setText(text); tv.setTextColor(textColor); tv.setTextSize(textSize); tv.setTag(position); return tv; } public int getPosition() { return (int) getCurrentView().getTag(); } public List<String> getNotices() { return notices; } public void setNotices(List<String> notices) { this.notices = notices; } public void setOnItemClickListener(OnItemClickListener onItemClickListener) { this.onItemClickListener = onItemClickListener; } public interface OnItemClickListener { void onItemClick(int position, TextView textView); } }
標(biāo)題名稱(chēng):Android跑馬燈MarqueeView源碼解析-創(chuàng)新互聯(lián)
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