在RecyclerView里自动滚动TextView

Question

我目前的问题如下：我有一个RecyclerView，这个RecyclerView的每个元素都有一个TextView。我希望TextView自动滚动。如果有什么到目前为止已经试过：

自定义的TextView：

public class ScrollCustomTextView extends AppCompatTextView { 
public ScrollCustomTextView(Context context) { 
    super(context); 
} 

public ScrollCustomTextView(Context context, AttributeSet attrs, int defStyle) { 
    super(context,attrs,defStyle); 
} 

public ScrollCustomTextView(Context context, AttributeSet attrs) { 
    super(context,attrs); 
} 
@Override 
protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) { 
    if (focused) 
    super.onFocusChanged(focused, direction, previouslyFocusedRect); 
} 


@Override 
public void onWindowFocusChanged(boolean focused) { 
    if(focused) 
     super.onWindowFocusChanged(focused); 
} 


@Override 
public boolean isFocused() { 
    return true; 
} 

} 

和我的.xml文件看起来是这样的：

<package.ScrollCustomTextView 
     android:id="@+id/main_idea_name" 
     android:scrollHorizontally="true" 
     android:ellipsize="marquee" 
     android:marqueeRepeatLimit="marquee_forever" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textColor="@color/darkGreen" 
     android:textSize="27dp" 
     android:layout_marginTop="10dp" 
     android:maxLines="1" 
     android:textAppearance="@android:style/TextAppearance.Medium" 

     /> 

而在RecyclerView在为ViewHolder我设置

构造

textView.setSelected(true); 

但它不起作用。有没有人有解决这个问题的想法？

谢谢。

Answer 1

因此，这里的答案：

我把我的TextView一个Horizo​​ntalScrollView内，下面的代码添加到我的适配器为RecyclerView：

private void animateTextView(TextView mTextView) { 
    int textWidth = getTextViewWidth(mTextView); 
    int displayWidth = getDisplayWidth(mContext); 

/* Start animation only when text is longer than dislay width. */ 
    if(displayWidth<=textWidth) { 
     Animation mAnimation = new TranslateAnimation(
       0, -textWidth, 
       0, 0); 
     mAnimation.setDuration(10000); // Set custom duration. 
     mAnimation.setStartOffset(1000); // Set custom offset. 
     mAnimation.setRepeatMode(Animation.RESTART); // This will animate text back ater it reaches end. 
     mAnimation.setRepeatCount(Animation.INFINITE); // Infinite animation. 

     mTextView.startAnimation(mAnimation); 
    } 
} 

private int getDisplayWidth(Context context) { 
    int displayWidth; 

    WindowManager windowManager = (WindowManager)context.getSystemService(
      Context.WINDOW_SERVICE); 
    Display display = windowManager.getDefaultDisplay(); 
    Point screenSize = new Point(); 

    if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB_MR2) { 
     display.getSize(screenSize); 
     displayWidth = screenSize.x; 
    } else { 
     displayWidth = display.getWidth(); 
    } 

    return displayWidth; 
} 

private int getTextViewWidth(TextView textView) { 
    textView.measure(0, 0); // Need to set measure to (0, 0). 
    return textView.getMeasuredWidth(); 
} 

而且随着启动动画：

animateTextView(txtView); 

注意：不再需要自定义的TextView，只需使用普通的TextView即可。