Question

我在linearlayout中有一个视图和一个textview。 LinearLayout存在于ScrollView中。我希望滚动视图向下移动，单击该屏幕中的按钮，再次向上移动再次单击

Answer 1

试试这个 -

private ImageView list_scroll_iv;
private int focus_pos=1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list_scroll_iv = (ImageView)findViewById(R.id.list_scroll_iv);
    list_scroll_iv.setOnClickListener(this);
}



@Override
public void onClick(View v) {
    list_sv.post(new Runnable() {
        @Override
        public void run() {
            //1 for up and 2 for down
          if(focus_pos==1) {
              list_sv.fullScroll(ScrollView.FOCUS_DOWN);
              focus_pos=2;
              list_scroll_iv.setImageDrawable(getResources().getDrawable(R.drawable.blue_arrow_ic_up));
          }
          else {
              list_sv.fullScroll(ScrollView.FOCUS_UP);
              focus_pos=1;
              list_scroll_iv.setImageDrawable(getResources().getDrawable(R.drawable.blue_arrow_ic_down));
          }
        }
    });

}

Answer 2

要向下滚动按钮，请使用此按钮：

scrollView.post(new Runnable()
            {
                @Override
                public void run()
                {
                    //X,Y are scroll positions untill where you want scroll down
                    scrollView.scrollTo(X, Y);
                }
            });

要向上滚动按钮，请使用此按钮：

scrollView.post(new Runnable()
            {
                @Override
                public void run()
                {
                    //X,Y are scroll positions untill where you want scroll up
                    int X=0,Y=0;
                    scrollView.scrollTo(X, Y);
                }
            });

滚动按钮滚动滚动视图

2 个答案: