Android垂直滚动TextView

package com.example.jxdsamples.uistyle;
import android.content.Context;
import android.util.AttributeSet;
import android.view.animation.LinearInterpolator;
import android.widget.Scroller;
public class AutoTextView extends androidx.appcompat.widget.AppCompatTextView implements Runnable {
private static final float DEFAULT_SPEED = 15.0f;
private Scroller scroller;
private float speed = DEFAULT_SPEED;
private boolean continuousScrolling = true;
public AutoTextView(Context context) {
super(context);
setup(context);
}
public AutoTextView(Context context, AttributeSet attributes) {
super(context, attributes);
setup(context);
}
private void setup(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();
}
}
private 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);
if (continuousScrolling) {
post(this);
}
}
@Override
public void run() {
if (scroller.isFinished()) {
scroll();
} else {
post(this);
}
}
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;
}
}

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