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Android SeekBar可以實(shí)現(xiàn)垂直樣式嗎

小樊
170
2024-08-02 18:42:19
欄目: 編程語言

Android SeekBar默認(rèn)是水平樣式的，但是可以通過自定義SeekBar來實(shí)現(xiàn)垂直樣式?？梢酝ㄟ^設(shè)置SeekBar的旋轉(zhuǎn)角度或者使用自定義控件來實(shí)現(xiàn)垂直SeekBar。具體實(shí)現(xiàn)方式可以參考以下步驟：

  1. 通過設(shè)置SeekBar的旋轉(zhuǎn)角度來實(shí)現(xiàn)垂直樣式：
SeekBar seekBar = findViewById(R.id.seekBar);
seekBar.setRotation(90);
  1. 自定義垂直SeekBar控件： 可以通過繼承SeekBar類自定義一個垂直SeekBar控件，具體實(shí)現(xiàn)如下：
public class VerticalSeekBar extends SeekBar {

    public VerticalSeekBar(Context context) {
        super(context);
    }

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

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

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(heightMeasureSpec, widthMeasureSpec);
        setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
    }

    @Override
    protected synchronized void onDraw(Canvas canvas) {
        canvas.rotate(-90);
        canvas.translate(-getHeight(), 0);
        super.onDraw(canvas);
    }

    @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(getMax() - (int) (getMax() * event.getY() / getHeight()));
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                break;
        }

        return true;
    }
}

使用自定義的VerticalSeekBar控件：

<com.example.VerticalSeekBar
    android:id="@+id/verticalSeekBar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" />

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