自定义SeekBar滑动显示数字
651532704
8年前
<h2><strong>先来上个效果图：</strong></h2> <p style="text-align:center"><img src="https://simg.open-open.com/show/148feda6deb6b83c3d35f0853ddd58cd.gif"></p> <p style="text-align:center">2016092001.gif</p> <h2><strong>当滑动时：数值显示，滑动停止时显示数字。</strong></h2> <p>使用FrameLayout结合SeekBar。</p> <p>首先我们看看。Layout：</p> <pre> <code class="language-java"><?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></code></pre> <p>需要自定义可再上面修改图片问题颜色等，或者自己封装起来。</p> <p>初始化函数。</p> <pre> <code class="language-java">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); }</code></pre> <p>主要是根据是否有改变，和触摸进行判断字和图片的显示。</p> <pre> <code class="language-java">@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); } }</code></pre> <p>废话也不多说，原理很简单。</p> <p> </p> <p> </p> <p>来自：http://www.jianshu.com/p/3a67789e85bf</p> <p> </p>