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这篇文章主要介绍ScrollView与SeekBar绑定如何实现滑动时出现小滑块效果，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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1、重写SeekBar
public class VerticalSeekbar extends SeekBar {
public VerticalSeekbar(Context context) {
super(context);
}
public VerticalSeekbar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public VerticalSeekbar(Context context, AttributeSet attrs) {
super(context, attrs);
}
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(h, w, oldh, oldw);
}
@Override
public synchronized void setProgress(int progress) // it is necessary for calling setProgress on click of a button
{
super.setProgress(progress);
onSizeChanged(getWidth(), getHeight(), 0, 0);
}
@Override
protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(heightMeasureSpec, widthMeasureSpec);
setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
}
protected void onDraw(Canvas c) {
c.rotate(90);//旋转
c.translate(0, -getWidth());//旋转，这两行不可去掉
super.onDraw(c);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
setProgress((int) (getMax() * event.getY() / getHeight()));
onSizeChanged(getWidth(), getHeight(), 0, 0);
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
}2、重写SccrollView
public class ObservableScrollView extends ScrollView {
public ScrollViewListener scrollViewListener = null;
public ObservableScrollView (Context context) {
super(context);
}
public ObservableScrollView (Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
}
public interface ScrollViewListener {
void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy);
}
public ObservableScrollView (Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setScrollViewListener(ScrollViewListener scrollViewListener) {
this.scrollViewListener = scrollViewListener;
}
@Override
public void onScrollChanged(int x, int y, int oldx, int oldy) {
super.onScrollChanged(x, y, oldx, oldy);
if (scrollViewListener != null) {
scrollViewListener.onScrollChanged(this, x, y, oldx, oldy);
}
}
}3、主工程
public class Slider_Text extends Activity {
private TextView textView;
private Context context=this;
private Scroller scroller;
private ScrollBindHelper scrollBindHelper;
private VerticalSeekbar seekBar;
private ObservableScrollView scrollView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_slider__text);
scroller=new Scroller(context);
textView=(TextView)findViewById(R.id.text);
textView.setText("也许是在用这种方式告诉我，分开了就不要怀抱希望，现实，梦中都不能。\n" +
"\n" +
" 了，那些无处安放的情感就让它各自归位，你别来，");
seekBar = (VerticalSeekbar) findViewById(R.id.seekbar);
scrollView = (ObservableScrollView) findViewById(R.id.scrollView);
scrollBindHelper=new ScrollBindHelper(seekBar,scrollView);
scrollBindHelper.bind(seekBar,scrollView);
scrollView.setOnTouchListener(new View.OnTouchListener() {
private int lastY = 0;
private int touchEventId = -9983761;
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
View scroller = (View) msg.obj;
if (msg.what == touchEventId) {
if (lastY == scroller.getScrollY()) {
handleStop(scroller);
} else {
handler.sendMessageDelayed(handler.obtainMessage(touchEventId, scroller), 5);
lastY = scroller.getScrollY();
}
}
}
};
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
handler.sendMessageDelayed(handler.obtainMessage(touchEventId, v), 5);
}
return false;
}
//处理真正的事件
private void handleStop(Object view) {
ScrollView scroller = (ScrollView) view;
int scrollY = scroller.getScrollY();
System.out.println("scrollY"+scrollY);
seekBar.setVisibility(View.GONE);//滑动停止后，自动隐藏seekbar
}
});
}
}4、主布局
