Question

我有一个SQLite外部数据库。有一个TextView可以显示数据库的记录。在此TextView中获取和显示数据没有问题。现在我想做点别的。当用户滑动TextView时，我希望下一条记录显示在TextView中。当用户向后滑动时，将显示前一个记录。预先感谢。

Answer 1

可能您需要创建一个扩展TextView基类的自定义视图。

class SwipeableTextView extends TextView {
    //here is three constructors from View class
    public SwipeableTextView(Context context) {
        super(context);
    }

    public SwipeableTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

}

MainActivity.java

class MainActivity {

    int startX,
    starty = 0;

    //inside onCreate
    TextView tv = findViewById(R.id.myTextView)
    tv.setOnTouchListener(new OnTouchListener {
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN: //called when you touch view
                startx = event.x;
                starty = event.y;
                return true;
                break;

            case MotionEvent.ACTION_UP: //when you lift up your finger from viev
                return true;
                break;

            case MotionEvent.ACTION_MOVE: //when you finger on view
                int differenceX,
                differenceY;
                differenceX = startX - event.x;

                if (Math.abs(differenceX) > 50)
                changeTextMethod();

                return true;
            }
        }
    });
}

通过滑动在textview中显示sqlite数据库的下一条记录

1 个答案: