Android(安卓)实现歌词滚动

自定义TextView

public class VerticalScrollTextView extends TextView {    private Paint mPaint;    private float mX;    private Paint mPathPaint;       public int index = 0;    private List list;    public float mTouchHistoryY;    private int mY;     private float middleY;//    private static final int DY = 40; //    public VerticalScrollTextView(Context context) {        super(context);        init();    }    public VerticalScrollTextView(Context context, AttributeSet attr) {        super(context, attr);        init();    }    public VerticalScrollTextView(Context context, AttributeSet attr, int i) {        super(context, attr, i);        init();    }    private void init() {        setFocusable(true);        if(list==null){            list=new ArrayList();            Sentence sen=new Sentence(0,"  ");            list.add(0, sen);        }               //         mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setTextSize(24);        mPaint.setColor(Color.BLACK);        mPaint.setAlpha(80);        mPaint.setTypeface(Typeface.SERIF);        //         mPathPaint = new Paint();        mPathPaint.setAntiAlias(true);        mPathPaint.setColor(Color.RED);        mPathPaint.setTextSize(24);        mPathPaint.setTypeface(Typeface.SANS_SERIF);    }    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(0xEFeffff);        Paint p = mPaint;        Paint p2 = mPathPaint;        p.setTextAlign(Paint.Align.LEFT);        if (index == -1)            return;        p2.setTextAlign(Paint.Align.LEFT);        //         canvas.drawText(list.get(index).getName(), mX, middleY, p2);        float tempY = middleY;        //         for (int i = index - 1; i >= 0; i--) {                      tempY = tempY - DY;            if (tempY < 0) {                break;            }            canvas.drawText(list.get(i).getName(), mX, tempY, p);                   }        tempY = middleY;        //        for (int i = index + 1; i < list.size(); i++) {            //             tempY = tempY + DY;            if (tempY > mY) {                break;            }            canvas.drawText(list.get(i).getName(), mX, tempY, p);                   }    }    protected void onSizeChanged(int w, int h, int ow, int oh) {        super.onSizeChanged(w, h, ow, oh);        mX = w * 0.3f;         mY = h;        middleY = h * 0.5f;    }    public long updateIndex(int index) {            if (index == -1)            return -1;        this.index=index;               return index;    }    public List getList() {        return list;    }    public void setList(List list) {        this.list = list;    }    public void updateUI(){        new Thread(new updateThread()).start();    }    class updateThread implements Runnable {        long time = 300;         int i=0;        public void run() {            while (true) {                long sleeptime = updateIndex(i);                time += sleeptime;                mHandler.post(mUpdateResults);                if (sleeptime == -1)                    return;                try {                    Thread.sleep(time);                    i++;                    if(i==getList().size())                        {                           i=0;                           time = 300;                        }                } catch (InterruptedException e) {                                      e.printStackTrace();                }            }        }    }    Handler mHandler = new Handler();    Runnable mUpdateResults = new Runnable() {        public void run() {            invalidate(); //         }    };}

数据封装类

public class Sentence {    private String name;    private int index;    public Sentence(int index,String name){        this.name=name;        this.index=index;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getIndex() {        return index;    }    public void setIndex(int index) {        this.index = index;    }}

布局

<com.mypackager.ui.VerticalScrollTextView          android:id="@+id/scoll_textView"          android:layout_width="500dp"          android:layout_height="500dp"          android:text="@string/company_intrduce_text"          android:visibility="gone"          >com.mypackager.VerticalScrollTextView>

Activity代码

List lst=new ArrayList();            for(int i=0;i<8;i++){                if(i%2==0){                    Sentence sen=new Sentence(i,i+1+"NanJINGXIXI");                    lst.add(i, sen);                }else{                    Sentence sen=new Sentence(i,i+1+"Hello world!");                    lst.add(i, sen);                }            }               play_textView.setList(lst);            play_textView.updateUI();

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