先来上个效果图:
当滑动时:数值显示,滑动停止时显示数字,使用FrameLayout结合SeekBar。
首先我们看看。
Layout:
<?xml version="1.0" encoding="utf-8"?> <merge xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"> <RelativeLayout android:id="@+id/wrapper_seekbar_indicator" android:layout_width="wrap_content" android:layout_height="wrap_content"> <ImageView android:id="@+id/img_seekbar_indicator" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" /> <TextView android:id="@+id/txt_seekbar_indicated_progress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:textColor="#333333" android:textSize="@dimen/space_12" tools:text="100" /> </RelativeLayout> <RelativeLayout android:id="@+id/wrapper_seekbar" android:layout_width="wrap_content" android:layout_height="wrap_content"> <SeekBar android:id="@+id/seekbar" style="@style/Widget.SeekBar.normal" android:layout_width="match_parent" android:layout_height="wrap_content" /> </RelativeLayout> </merge>
初始化函数。
private void init(Context context,AttributeSet attrs,int defStyle) { View view = LayoutInflater.from(context).inflate( R.layout.view_seekbar_indicated,this); bindViews(view); if (attrs != null) setAttributes(context,attrs,defStyle); mSeekBar.setonSeekBarchangelistener(this); mTextViewProgress.setText(String.valueOf(mSeekBar.getProgress())); getViewTreeObserver().addOnGlobalLayoutListener( new ViewTreeObserver.OnGlobalLayoutListener() { @TargetApi(Build.VERSION_CODES.JELLY_BEAN) @Override public void onGlobalLayout() { mMeasuredWidth = mSeekBar.getWidth() - mSeekBar.getPaddingLeft() - mSeekBar.getPaddingRight(); mSeekBar.setPadding( mSeekBar.getPaddingLeft(),mSeekBar.getPaddingTop() + mWrapperIndicator.getHeight(),mSeekBar.getPaddingRight(),mSeekBar.getPaddingBottom()); setIndicator(); getViewTreeObserver() .removeOnGlobalLayoutListener(this); } }); // mWrapperIndicator.setVisibility(View.GONE); }
@Override public void onProgressChanged(SeekBar seekBar,int progress,boolean fromUser) { setIndicator(); if (mOnSeekBarchangelistener != null) mOnSeekBarchangelistener.onProgressChanged(seekBar,progress,fromUser); } @Override public void onStartTrackingTouch(SeekBar seekBar) { if (mOnSeekBarchangelistener != null) { mOnSeekBarchangelistener.onStartTrackingTouch(seekBar); mWrapperIndicator.setVisibility(View.VISIBLE); } } @Override public void onStopTrackingTouch(SeekBar seekBar) { if (mOnSeekBarchangelistener != null) { mOnSeekBarchangelistener.onStopTrackingTouch(seekBar); mWrapperIndicator.setVisibility(View.GONE); } }
废话也不多说,原理很简单。
工程地址:
https://github.com/xiaoli1993/SeekBarIndicated/tree/47ffcc890fb9c7000bb20d9b248620564c2c8122