android 自定义跑马灯

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http://blog.csdn.net/u012184853/article/details/50129121

首先讨论下，android自带textview跑马灯的实现，需要哪些参数，其中比较烦人的就是，需要TextView获得焦点，跑马灯才能有效果，所以我们在对于布局gone掉，或者在ListView，ScrollView中跑马灯经常没有效果，无法获得焦点找原因，干脆就自己写一个，而且能实现复杂的需求

 <TextView     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:ellipsize="marquee"     android:focusable="true"     android:focusableInTouchMode="true"     android:marqueeRepeatLimit="marquee_forever"     android:scrollHorizontally="true"     android:singleLine="true"     />

自定义跑马灯控件

import java.util.List;import android.content.Context;import android.graphics.Paint;import android.text.TextUtils.TruncateAt;import android.util.AttributeSet;import android.view.Gravity;import android.widget.TextView;public class MarqueeText extends TextView implements Runnable{    private int currentScrollX;    private boolean isStop = false;     private int textWidth;     private List<String> mList;    private final int REPEAT = 1;    private int repeatCount = 0;    private int currentNews = 0;    public MarqueeText(Context context) {         super(context);         init();    }     public MarqueeText(Context context, AttributeSet attrs) {         super(context, attrs);         init();    }     public MarqueeText(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         init();    }     public void init(){        setClickable(true);        setSingleLine(true);        setEllipsize(TruncateAt.MARQUEE);        setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL);    }    public void setData(List<String> mList){        if(mList == null || mList.size()==0){            return;        }        this.mList = mList;         currentNews = 0;        String n = mList.get(currentNews);        setText(n);        setTag(n);        startScroll();    }    @Override    public void setText(CharSequence text, BufferType type) {        super.setText(text, type);        MeasureTextWidth();     }    @Override    public void onScreenStateChanged(int screenState) {        super.onScreenStateChanged(screenState);        if(screenState == SCREEN_STATE_ON){            startScroll();        }else{            stopScroll();        }    }    /**      * 获取文字宽度      */     private void MeasureTextWidth() {         Paint paint = this.getPaint();         String str = this.getText().toString();         textWidth = (int) paint.measureText(str);     }     @Override     public void run() {         if(textWidth < 1){            if(mList != null && mList.size() > 0){                nextNews();            }else{                return;            }        }        currentScrollX += 1;// 滚动速度         scrollTo(currentScrollX, 0);         if (isStop) {             return;         }         if (getScrollX() >= textWidth) {             currentScrollX = -getWidth();             scrollTo(currentScrollX, 0);             if(repeatCount >= REPEAT){                nextNews();            }else{                repeatCount ++;            }        }         postDelayed(this, 10);     }    private void nextNews(){        repeatCount = 0;        currentNews ++;        currentNews = currentNews%mList.size();        String n = mList.get(currentNews);        setText(n);        setTag(n);    }    // 开始滚动     public void startScroll() {         isStop = false;         this.removeCallbacks(this);         post(this);     }     // 停止滚动     public void stopScroll() {         isStop = true;     } }

源码下载地址

http://download.csdn.net/detail/u012184853/9315723

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