seekbar thumb onclicklistener

Question

我需要自定义默认的android搜索栏来控制音乐播放器。我知道这听起来很简单，但我不知道如何设置seekbar thumb 监听器。当用户按下seekbar thumb图标时，我想控制音乐并相应地更改图标以播放和暂停。我怎样才能做到这一点？我知道这是可能的，因为我以前看过像PocketGuide这样的应用程序实现了这个功能。这是PocketGuide应用

的屏幕截图

Answer 1

也许这会对你有所帮助。根据您的需要调整代码。

public class SeekbarWithThumbTouch extends SeekBar {

    private int     scaledTouchSlop = 0;
    private float   initTouchX      = 0;
    private boolean thumbPressed    = false;

    public SeekbarWithThumbTouch(Context context) {
        super(context);
        init(context);
    }

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

    public SeekbarWithThumbTouch(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context) {
        scaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Drawable thumb = null;
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                thumb = getThumb();//works only for API >=16!
                if (thumb != null) {
                    //contains current position of thumb in view as bounds
                    RectF bounds = new RectF(thumb.getBounds());
                    thumbPressed = bounds.contains(event.getX(), event.getY());
                    if (thumbPressed) {
                        Log.d("Thumb", "pressed");
                        initTouchX = event.getX();
                        return true;
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
                if (thumbPressed) {
                    Log.d("Thumb", "was pressed -- listener call");
                    thumbPressed = false;
                }
                break;
            case MotionEvent.ACTION_MOVE:
                if (thumbPressed) {
                    if (Math.abs(initTouchX - event.getX()) > scaledTouchSlop) {
                        initTouchX = 0;
                        thumbPressed = false;
                        return super.onTouchEvent(event);
                    }
                    Log.d("Thumb", "move blocked");
                    return true;
                }
                break;
        }

        return super.onTouchEvent(event);
    }
}