滚动字幕（水平，垂直）

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水平，垂直的滚动字幕：（可设置属性：点击暂停，水平垂直，速度，次数，文字内容，文字颜色，文字大小等。。。）

注：

图片中黑色部分必须加上，红色部分换成项目的包名。

最重要的滚动类：ScrollTextView：

package com.example.test; import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.graphics.PixelFormat;import android.graphics.PorterDuff.Mode;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import com.example.scrolltextview.R; public class ScrollTextView extends SurfaceView implements                   SurfaceHolder.Callback {          private final String TAG = "ScrollTextView";          private SurfaceHolder holder;         private Paint paint = null;// 画笔         private boolean bStop = false; // 停止滚动          private boolean clickEnable = false; // 可以点击         private boolean isHorizontal = true; // 水平｜垂直         private int speed = 1; // 滚动速度         private String text = "";// 文本内容         private float textSize = 15f; // 字号         private int textColor = Color.BLACK; // 文字颜色         private int times = Integer.MAX_VALUE; // 滚动次数          private int viewWidth = 0;// 控件的长度         private int viewHeight = 0; // 控件的高度         private float textWidth = 0f;// 水平滚动时的文本长度         private float textHeight = 0f; // 垂直滚动时的文本高度          private float textX = 0f;// 文字的横坐标         private float textY = 0f;// 文字的纵坐标         private float viewWidth_plus_textLength = 0.0f;// 显示总长度         private int time = 0; // 已滚动次数          private ScheduledExecutorService scheduledExecutorService; // 执行滚动线程          public ScrollTextView(Context context) {                   super(context);         }          public ScrollTextView(Context context, AttributeSet attrs) {                   super(context, attrs);                   holder = this.getHolder();                   holder.addCallback(this);                   paint = new Paint();                   TypedArray arr = getContext().obtainStyledAttributes(attrs,                                     R.styleable.scroll);                   clickEnable = arr.getBoolean(R.styleable.scroll_clickEnable,                                     clickEnable);                   isHorizontal = arr.getBoolean(R.styleable.scroll_isHorizontal,                                     isHorizontal);                   speed = arr.getInteger(R.styleable.scroll_speed, speed);                   text = arr.getString(R.styleable.scroll_text);                   textColor = arr.getColor(R.styleable.scroll_textColor, textColor);                   textSize = arr.getDimension(R.styleable.scroll_textSize, textSize);                   times = arr.getInteger(R.styleable.scroll_times, times);                    time = times;                   paint.setColor(textColor);                   paint.setTextSize(textSize);                    /*                    * 下面两行代码配合draw()方法中的canvas.drawColor(Color.TRANSPARENT,Mode.CLEAR);                    * 将画布填充为透明                    */                   setZOrderOnTop(true);                   getHolder().setFormat(PixelFormat.TRANSLUCENT);                    setFocusable(true); // 设置焦点         }          @Override         protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {                   // TODO Auto-generated method stub                   super.onMeasure(widthMeasureSpec, heightMeasureSpec);                   viewWidth = MeasureSpec.getSize(widthMeasureSpec);                   viewHeight = MeasureSpec.getSize(heightMeasureSpec);                   if (isHorizontal) { // 水平滚动                            textWidth = paint.measureText(text);// measure()方法获取text的长度                            viewWidth_plus_textLength = viewWidth + textWidth;                            textY = (viewHeight - getFontHeight(textSize)) / 2                                               + getPaddingTop() - getPaddingBottom();                   } else { // 垂直滚动                            textHeight = getFontHeight(textSize) * text.length();                            viewWidth_plus_textLength = viewHeight + textHeight;                            textX = (viewWidth - textSize) / 2 + getPaddingLeft()                                               - getPaddingRight();                   }         }          @Override         public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {          }          @Override         public void surfaceCreated(SurfaceHolder holder) {                   bStop = false;                   scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();                   scheduledExecutorService.scheduleAtFixedRate(new ScrollThread(), 1000,                                     10, TimeUnit.MILLISECONDS);                   Log.d(TAG, "ScrollTextView is created");          }          @Override         public void surfaceDestroyed(SurfaceHolder arg0) {                   // TODO Auto-generated method stub                   bStop = true;                   scheduledExecutorService.shutdown();                   Log.d(TAG, "ScrollTextView is destroyed");         }          // 获取字体高度         public int getFontHeight(float fontSize) {                   Paint paint = new Paint();                   paint.setTextSize(fontSize);                   FontMetrics fm = paint.getFontMetrics();                   return (int) Math.ceil(fm.descent - fm.ascent);         }          public void setTimes(int times) {                   if(times <= 0){                            this.times = Integer.MAX_VALUE;                   }else{                            this.times = times;                            time = times;                   }                         }          public void setText(String text) {                   this.text = text;         }                 public void setSpeed(int speed){                   if(speed > 10 || speed < 0){                            throw new IllegalArgumentException("Speed was invalid integer, it must between 0 and 10");                   }else{                            this.speed = speed;                   }         }          /**          * 当屏幕被触摸时调用          */         @Override         public boolean onTouchEvent(MotionEvent event) {                   if (!clickEnable) {                            return true;                   }                   switch (event.getAction()) {                   case MotionEvent.ACTION_DOWN:                            bStop = !bStop;                            if (!bStop && time == 0) {                                     time = times;                            }                            break;                   }                   return true;         }          public synchronized void draw(float X, float Y) {                   Canvas canvas = holder.lockCanvas();                   canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);// 通过清屏把画布填充为透明                   if (isHorizontal) { // 水平滚动                            canvas.drawText(text, X, Y, paint);                   } else { // 垂直滚动                            for (int i = 0; i < text.length(); i++) {                                     canvas.drawText(text.charAt(i) + "", X, Y + (i + 1)                                                        * getFontHeight(textSize), paint);                            }                   }                   holder.unlockCanvasAndPost(canvas);         }          class ScrollThread implements Runnable {                    @Override                   public void run() {                            // TODO Auto-generated method stub                             while (!bStop) {                                     if (isHorizontal) {                                               draw(viewWidth - textX, textY);                                               textX += speed;// 速度设置：1-10                                               if (textX > viewWidth_plus_textLength) {                                                        textX = 0;                                                        --time;                                               }                                     } else {                                               draw(textX, viewHeight - textY);                                               textY += speed;                                               if (textY > viewWidth_plus_textLength) {                                                        textY = 0;                                                        --time;                                               }                                     }                                     if (time <= 0) {                                               bStop = true;                                     }                            }                   }         }}

界面布局：activity_main.xml：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:start="http://schemas.android.com/apk/res/com.example.scrolltextview"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <com.example.test.ScrollTextView        android:id="@+id/hor"        android:layout_width="match_parent"        android:layout_height="100dp"        android:layout_alignParentBottom="true"        android:layout_marginBottom="-40dp"        android:background="#000000"        start:clickEnable="true"        start:isHorizontal="true"        start:speed="1"        start:text="paulpaulpaul"        start:textColor="#ffffff"        start:textSize="30sp"        start:times="3" />    <com.example.test.ScrollTextView        android:layout_width="100dp"        android:layout_height="match_parent"        android:layout_above="@id/hor"        android:layout_centerHorizontal="true"        android:background="#ffffff"        start:clickEnable="false"        start:isHorizontal="false"        start:speed="3"        start:text="王鹏程王鹏程王鹏程"        start:textColor="#000000"        start:textSize="30sp" /></RelativeLayout>

属性配置：attr.xml：

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="scroll">        <attr name="clickEnable" format="boolean" />        <attr name="isHorizontal" format="boolean" />        <attr name="speed" format="integer" />        <attr name="text" format="string" />        <attr name="textColor" format="color" />        <attr name="textSize" format="dimension" />        <attr name="times" format="integer" />    </declare-styleable></resources>

demo源码下载地址：http://download.csdn.net/detail/u012604745/9414610点击打开链接

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