TextSeekBar 文字跟随拖快移动

来源：互联网发布：金十数据看白银编辑：程序博客网时间：2024/06/06 09:58
public class TextSeekBar extends SeekBar {
/** 文本的颜色 */private int mTitleTextColor = Color.TRANSPARENT;/** 文本的大小 */private float mTitleTextSize = 18;/** 文字的内容 */private String mTitleText;/** 文字距离进度条的距离 */float mTextY = 18;/** 得到拖快的宽度 */private int mThumbWidth;/** 得到进度条的宽度 */private int mSeekWidth;/** 画文字画笔 */private Paint mPaint;/** 文本偏差值  */private int mDeviationValue=0;public TextSeekBar(Context context) {    super(context);    initView();}public TextSeekBar(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    initView();}public TextSeekBar(Context context, AttributeSet attrs) {    super(context, attrs);    initView();}/** * 初始化view */private void initView() {    initPaint();}private void initPaint() {    this.mPaint = new Paint();    // 设置抗锯齿    this.mPaint.setAntiAlias(true);    this.mPaint.setTextSize(mTitleTextSize);    // 这里设置40是因为拖快的大小是80    setPadding(40, 0, 40, 0);}@SuppressLint("NewApi")@Overrideprotected void onLayout(boolean changed, int left, int top, int right,        int bottom) {    super.onLayout(changed, left, top, right, bottom);    if (changed) {        // 得到拖快的宽        Rect rectThumb = getThumb().getBounds();        mThumbWidth = rectThumb.width();        // 得到进度条的宽        Rect rectSeek = this.getProgressDrawable().getBounds();        mSeekWidth = rectSeek.width();    }}/** * 设置文本偏差值,用来设置显示实际内容和显示内容之间的差 */public void setTextDeviation(int value) {    mDeviationValue=value;}@Overrideprotected synchronized void onDraw(Canvas canvas) {    super.onDraw(canvas);    // 得到写的内容    mTitleText = getProgress() + mDeviationValue+ "";    // 文字的宽    float numTextWidth = mPaint.measureText(mTitleText);    float text_x = mSeekWidth * getProgress() / getMax() + (mThumbWidth - numTextWidth) / 2;    this.mPaint.setColor(mTitleTextColor);    canvas.drawText(mTitleText, text_x, mTextY, mPaint);// 画文字}@Overridepublic boolean onTouchEvent(MotionEvent ev) {    switch (ev.getAction()) {    case MotionEvent.ACTION_DOWN:        mTitleTextColor=Color.WHITE;        break;    case MotionEvent.ACTION_MOVE:        mTitleTextColor=Color.WHITE;        break;    case MotionEvent.ACTION_UP:    case MotionEvent.ACTION_CANCEL:        mTitleTextColor=Color.TRANSPARENT;        break;    default:        break;    }    invalidate();}
}
0 0