Android实现歌词滚动效果实现歌词滚动效果
本文实例为大家分享了Android实现歌词滚动效果的具体代码，供大家参考，具体内容如下
自定义TextView
public class VerticalScrollTextView extends TextView {
private Paint mPaint;
private float mX;
private Paint mPathPaint;
public int index = 0;
private List<Sentence> 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>();
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;
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