android 跑马灯（继承TextView）

最新推荐文章于 2022-02-08 23:06:56 发布

原创最新推荐文章于 2022-02-08 23:06:56 发布 · 247 阅读

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文章标签：

#Android #textview #自定义view

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本文介绍了一种基于Android平台的跑马灯效果视图组件的实现方式。通过自定义TextView并利用Scroller进行水平滚动，实现了消息的循环显示功能。文章提供了完整的代码示例，包括初始化数据源和启动滚动的方法。

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package com.example.administrator.zxqdemo;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.animation.AccelerateInterpolator;
import android.widget.Scroller;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Administrator on 2016/9/27.
 */
public class RunHorseView extends TextView {

    private Scroller mScroller;

    public RunHorseView(Context context) {
        super(context);
    }

    public RunHorseView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mScroller=new Scroller(context,new AccelerateInterpolator());
    }

    public RunHorseView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mScroller=new Scroller(context,new AccelerateInterpolator());
    }


    private List<String> listSource;
    private int size;
    public  void initSource(List<String> listSource)
    {
        this.listSource=listSource;
        size=listSource.size();
    }

    String drawText="";
    @Override
    protected void onDraw(Canvas canvas)
    {
        this.setText(drawText);
        Log.e("dd","ondraw");

        super.onDraw(canvas);
    }
    int index=0;
    @Override
    public void computeScroll() {


        if(mScroller.computeScrollOffset())
        {
            Log.e("dd","x:"+mScroller.getCurrX()+"y:"+mScroller.getCurrY());
            scrollTo(mScroller.getCurrX(),mScroller.getCurrY());
            Log.e("dd","compute");
            postInvalidate();
        }else {
            drawText=listSource.get(index);
            startScorll();
            index++;
            index=index%size;
        }

        super.computeScroll();
    }


    public void startScorll()
    {

            int dy=getHeight()-((int)getTextSize())/2;
            Log.e("dy","dy:"+dy);
            mScroller.startScroll(0,0,0,dy,2000);
            Log.e("dd","start");
            invalidate();


    }

}
//调用过程
RunHorseView runHorseView= (RunHorseView) findViewById(R.id.runHorse);
List<String> list=new ArrayList<>();
list.add("张三 你中了5000000");
list.add("李四 你中了5000000");
list.add("王五 你中了5000000");
list.add("孙六 你中了5000000");
list.add("钱七 你中了5000000");
list.add("周八 你中了5000000");
runHorseView.initSource(list);
runHorseView.startScorll();