Android中的自动滚动TextView将文本带入视图

的文章：

java
public class AutoScrollTextView extends TextView {
    private static final int DEFAULT_SPEED = 100; // 默认滚动速度
    private static final int DEFAULT_DELAY = 2000; // 默认滚动延迟
    private final Handler mHandler;
    private final Runnable mScrollRunnable;
    private int mSpeed;
    private int mDelay;
    public AutoScrollTextView(Context context) {
        this(context, null);
    }
    public AutoScrollTextView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public AutoScrollTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mHandler = new Handler();
        mScrollRunnable = new Runnable() {
            @Override
            public void run() {
                // 计算滚动距离
                int scrollAmount = getScrollX() + mSpeed;
                // 判断是否需要滚动到文本的末尾
                if (scrollAmount >= getTextWidth()) {
                    scrollTo(getTextWidth(), 0);
                    mHandler.postDelayed(mScrollRunnable, mDelay);
                } else {
                    // 滚动到指定位置
                    scrollTo(scrollAmount, 0);
                    mHandler.postDelayed(mScrollRunnable, 16);
                }
            }
        };
        // 获取自定义属性
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.AutoScrollTextView);
        mSpeed = typedArray.getInt(R.styleable.AutoScrollTextView_scrollSpeed, DEFAULT_SPEED);
        mDelay = typedArray.getInt(R.styleable.AutoScrollTextView_scrollDelay, DEFAULT_DELAY);
        typedArray.recycle();
    }
    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        // 开始滚动
        mHandler.postDelayed(mScrollRunnable, mDelay);
    }
    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        // 停止滚动
        mHandler.removeCallbacks(mScrollRunnable);
    }
    private int getTextWidth() {
        return (int) getPaint().measureText(getText().toString());
    }
}

xml
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="这是一个自动滚动的文本"
    app:scrollSpeed="150"
    app:scrollDelay="3000" />