增加和減少按鈕點擊自動滾動文本速度

Question

我想實現增加和減少按鈕點擊自動滾動文本的速度，但我無法弄清楚如何做到這一點。我曾嘗試聲明一個默認速度，並通過使用按鈕增加或減少其值，但這並不奏效。 任何幫助將是great.please幫我

ScrollTextView.java：

public class ScrollTextView extends TextView { 

public float DEFAULT_SPEED = 9.0f; 

public Scroller scroller; 
public float speed = DEFAULT_SPEED; 
public boolean continuousScrolling = true; 

public ScrollTextView(Context context) { 
    super(context); 
    scrollerInstance(context); 
} 

public ScrollTextView(Context context, AttributeSet attributes) { 
    super(context, attributes); 
    scrollerInstance(context); 
} 

public void scrollerInstance(Context context) { 
    scroller = new Scroller(context, new LinearInterpolator()); 
    setScroller(scroller); 
} 


@Override 
protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 
    super.onLayout(changed, left, top, right, bottom); 
    if (scroller.isFinished()) { 
     scroll(); 
    } 
} 

public void scroll() { 
    int viewHeight = getHeight(); 
    int visibleHeight = viewHeight - getPaddingBottom() - getPaddingTop(); 
    int lineHeight = getLineHeight(); 

    int offset = -1 * visibleHeight; 
    int distance = visibleHeight + getLineCount() * lineHeight; 
    int duration = (int) (distance * speed); 


    scroller.startScroll(0, offset, 0, distance, duration); 
} 



public void setSpeed(float speed) { 
    this.speed = speed; 
} 

public float getSpeed() { 
    return speed; 
} 

public void setContinuousScrolling(boolean continuousScrolling) { 
    this.continuousScrolling = continuousScrolling; 
} 

public boolean isContinuousScrolling() { 
    return continuousScrolling; 
} 

Answer 1

看看這個Marquee Set Speed

如果你想增加滾動速度然後減少的值爲：

私人INT mRndDuration = 10000; //減少mRndDuration的價值增加滾動速度