添加自定义 MarqueeTextView

marquee/src/main/java/com/xiaweizi/marquee/MarqueeTextView.java

@@ -0,0 +1,194 @@
+package com.xiaweizi.marquee;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Rect;
+import android.os.Handler;
+import android.os.Looper;
+import android.text.TextPaint;
+import android.util.AttributeSet;
+import android.view.animation.LinearInterpolator;
+import android.widget.Scroller;
+import android.widget.TextView;
+
+/**
+ * <pre>
+ *     author : xiaweizi
+ *     class  : com.xiaweizi.marquee.MarqueeTextView
+ *     e-mail : 1012126908@qq.com
+ *     time   : 2017/12/26
+ *     desc   : 自定义跑马灯
+ * </pre>
+ */
+
+@SuppressLint("AppCompatCustomView")
+public class MarqueeTextView extends TextView {
+
+    /** 默认滚动时间 */
+    private static final int ROLLING_INTERVAL_DEFAULT = 10000;
+    /** 第一次滚动默认延迟 */
+    private static final int FIRST_SCROLL_DELAY_DEFAULT = 1000;
+    /** 滚动模式-一直滚动 */
+    public static final int SCROLL_FOREVER = 100;
+    /** 滚动模式-只滚动一次 */
+    public static final int SCROLL_ONCE = 101;
+
+    /** 滚动器 */
+    private Scroller mScroller;
+    /** 滚动一次的时间 */
+    private int mRollingInterval;
+    /** 滚动的初始 X 位置 */
+    private int mXPaused = 0;
+    /** 是否暂停 */
+    private boolean mPaused = true;
+    /** 是否第一次 */
+    private boolean mFirst = true;
+    /** 滚动模式 */
+    private int mScrollMode;
+    /** 初次滚动时间间隔 */
+    private int mFirstScrollDelay;
+
+    public MarqueeTextView(Context context) {
+        this(context, null);
+    }
+
+    public MarqueeTextView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public MarqueeTextView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        initView(context, attrs, defStyle);
+    }
+
+    private void initView(Context context, AttributeSet attrs, int defStyle) {
+        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MarqueeTextView);
+        mRollingInterval = typedArray.getInt(R.styleable.MarqueeTextView_scroll_interval, ROLLING_INTERVAL_DEFAULT);
+        mScrollMode = typedArray.getInt(R.styleable.MarqueeTextView_scroll_mode, SCROLL_FOREVER);
+        mFirstScrollDelay = typedArray.getInt(R.styleable.MarqueeTextView_scroll_first_delay, FIRST_SCROLL_DELAY_DEFAULT);
+        typedArray.recycle();
+        setSingleLine();
+        setEllipsize(null);
+    }
+
+    /**
+     * 开始滚动
+     */
+    public void startScroll() {
+        mXPaused = 0;
+        mPaused = true;
+        mFirst = true;
+        resumeScroll();
+    }
+
+    /**
+     * 继续滚动
+     */
+    public void resumeScroll() {
+        if (!mPaused)
+            return;
+        // 设置水平滚动
+        setHorizontallyScrolling(true);
+
+        // 使用 LinearInterpolator 进行滚动
+        if (mScroller == null) {
+            mScroller = new Scroller(this.getContext(), new LinearInterpolator());
+            setScroller(mScroller);
+        }
+        int scrollingLen = calculateScrollingLen();
+        final int distance = scrollingLen - (getWidth() + mXPaused);
+        final int duration = (Double.valueOf(mRollingInterval * distance * 1.00000
+                / scrollingLen)).intValue();
+        if (mFirst) {
+            new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    mScroller.startScroll(mXPaused, 0, distance, 0, duration);
+                    invalidate();
+                    mPaused = false;
+                }
+            }, mFirstScrollDelay);
+        } else {
+            mScroller.startScroll(mXPaused, 0, distance, 0, duration);
+            invalidate();
+            mPaused = false;
+        }
+    }
+
+    /**
+     * 暂停滚动
+     */
+    public void pauseScroll() {
+        if (null == mScroller)
+            return;
+
+        if (mPaused)
+            return;
+
+        mPaused = true;
+
+        mXPaused = mScroller.getCurrX();
+
+        mScroller.abortAnimation();
+    }
+
+    /**
+     * 停止滚动，并回到初始位置
+     */
+    public void stopScroll() {
+        if (null == mScroller) {
+            return;
+        }
+        mPaused = true;
+        mScroller.startScroll(0, 0, 0, 0, 0);
+    }
+
+    /**
+     * 计算滚动的距离
+     *
+     * @return 滚动的距离
+     */
+    private int calculateScrollingLen() {
+        TextPaint tp = getPaint();
+        Rect rect = new Rect();
+        String strTxt = getText().toString();
+        tp.getTextBounds(strTxt, 0, strTxt.length(), rect);
+        int scrollingLen = rect.width() + getWidth();
+        rect = null;
+        return scrollingLen;
+    }
+
+    @Override
+    public void computeScroll() {
+        super.computeScroll();
+        if (null == mScroller) return;
+        if (mScroller.isFinished() && (!mPaused)) {
+            if (mScrollMode == SCROLL_ONCE) {
+                stopScroll();
+                return;
+            }
+            mPaused = true;
+            mXPaused = -1 * getWidth();
+            mFirst = false;
+            this.resumeScroll();
+        }
+    }
+
+    /** 获取滚动一次的时间 */
+    public int getRndDuration() {return mRollingInterval;}
+    /** 设置滚动一次的时间 */
+    public void setRndDuration(int duration) {this.mRollingInterval = duration;}
+    /** 设置滚动模式 */
+    public void setScrollMode(int mode) {this.mScrollMode = mode;}
+    /** 获取滚动模式 */
+    public int getScrollMode() {return this.mScrollMode;}
+    /** 设置第一次滚动延迟 */
+    public void setScrollFirstDelay(int delay) {this.mFirstScrollDelay = delay;}
+    /** 获取第一次滚动延迟 */
+    public int getScrollFirstDelay() {return mFirstScrollDelay;}
+
+    public boolean isPaused() {
+        return mPaused;
+    }
+}

marquee/src/main/res/values/attrs.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="MarqueeTextView">
+        <attr name="scroll_interval" format="integer" />
+        <attr name="scroll_first_delay" format="integer"/>
+        <attr name="scroll_mode">
+            <enum name="mode_forever" value="100"/>
+            <enum name="mode_once" value="101"/>
+        </attr>
+    </declare-styleable>
+</resources>