Android实现歌词滚动效果
程序员文章站
2022-06-04 12:24:22
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 verticalscr...
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; // 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<sentence> getlist() { return list; } public void setlist(list<sentence> 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<sentence>(); 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();
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。