Android 如何在SeekBar拇指中间添加TextView？

我在安卓系统工作。我想做一个

SeekBar

。在

SeekBar的thumb中

我想显示进度（可能在

TextView上

与thumb对齐，thumb随thumb一起移动）

这是我的XML，用于

SeekBar

和

TextView

<SeekBar
    android:id="@+id/ProgressBar01"
    android:layout_width="fill_parent"
    android:paddingLeft="10px"
    android:paddingRight ="10px"
    android:layout_height="70dp"
    android:layout_below="@+id/incentives_textViewBottemLeft"
    android:max="10"
    android:progressDrawable="@drawable/incentive_progress"
    android:secondaryProgress="0"
    android:thumb="@drawable/incentives_progress_pin"
    android:focusable="false" />

<TextView
    android:id="@+id/incentives_textViewAbove_process_pin"
    android:layout_width="fill_parent"
    android:layout_height="20dp"
    android:layout_below="@+id/incentives_textViewBottemLeft"
    android:layout_marginTop="11dp"
    android:text=""
    android:textStyle="bold"
    android:textColor="#FFe4e1"
    android:textSize="15sp" />

---

但文本并没有显示在拇指的中央。请建议我该怎么做。

如果我正确理解您的问题，您希望将文本放在一个搜索杆上的拇指内侧，如下所示：

Android Seekbar不公开任何公共或受保护的方法，允许您在拇指中设置文本。因此，您无法按原样使用Android SeekBar实现解决方案

作为解决方案，您可以编写自己的CustomSeekBar

Android扩展了。拇指的位置是在AbsSeekBar中设置的，如下所示：

 private void setThumbPos(int w, Drawable thumb, float scale, int gap) {
    int available = w - mPaddingLeft - mPaddingRight;
    int thumbWidth = thumb.getIntrinsicWidth();
    int thumbHeight = thumb.getIntrinsicHeight();
    available -= thumbWidth;

    // The extra space for the thumb to move on the track
    available += mThumbOffset * 2;

    //Determine horizontal position
    int thumbPos = (int) (scale * available);

    //Determine vertical position
    int topBound, bottomBound;
    if (gap == Integer.MIN_VALUE) {
        Rect oldBounds = thumb.getBounds();
        topBound = oldBounds.top;
        bottomBound = oldBounds.bottom;
    } else {
        topBound = gap;
        bottomBound = gap + thumbHeight;
    }

    //Set the thumbs position
    thumb.setBounds(thumbPos, topBound, thumbPos + thumbWidth, bottomBound);
}

在AbsSeekBar的onDraw（）方法中，绘制拇指：

mThumb.draw(canvas);

要实现自己的SeekBar，首先创建一个扩展AbsSeekBar的CustomSeekBar类。然后在CustomSeekBar类中重写AbsSeekBar的setThumps（）方法，并在其中设置自定义thumb的位置

您的自定义拇指将是一个视图或视图组，例如LinearLayout，具有可绘制的背景和进度百分比文本的文本视图

---

然后，您必须决定如何将进度百分比写入自定义thumb。您可以使用一个名为inside setThumbPos（）的新writeTextOnThumb方法（）在thumb上编写进度百分比文本，也可以在CustomSeekBar的API中将其作为公共方法公开。

在深入了解解决方案的细节之前，我只想提一件您可能已经考虑过的事情：用户，移动SeekBar时，通常将她的手指放在拇指上，因此可能会掩盖您可能放在那里的任何文本，至少在移动SeekBar时是这样。现在，您可能正在以编程方式移动SeekBar，或者您很高兴用户在移动完SeekBar并取下手指后可以查看SeekBar，或者您可以指望用户在开始滑动SeekBar后将手指滑动到SeekBar下方，以露出拇指。但如果不是这样，那么您可能希望将文本放置在用户手指可能不在的位置

下面描述的方法应该允许您将文本定位到SeekBar中您喜欢的任何位置，包括拇指上方。为了实现这一点，它将重写SeekBar的基本onDraw（）方法，而不是重写专门用于绘制拇指的方法

下面是一个类的粗略版本，该类使用上述方法将文本绘制到SeekBar上：

public class SeekBarWithText extends SeekBar {

  private static final int textMargin = 6;
  private static final int leftPlusRightTextMargins = textMargin + textMargin;
  private static final int maxFontSize = 18;
  private static final int minFontSize = 10;

  protected String overlayText;
  protected Paint textPaint;

  public SeekBarWithText(Context context) {
    super(context);
    Resources resources = getResources();

    //Set up drawn text attributes here
    textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    textPaint.setTypeface(Typeface.DEFAULT_BOLD);
    textPaint.setTextAlign(Align.LEFT);
  }

  //This attempts to ensure that the text fits inside your SeekBar on a resize
  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    setFontSmallEnoughToFit(w - leftPlusRightTextMargins)));
  }

  //Finds the largest text size that will fit
  protected void setFontSmallEnoughToFit(int width) {
    int textSize = maxTextSize;
    textPaint.setTextSize(textSize);
    while((textPaint.measureText(sampleText) > width) && (textSize > minTextSize)) {
      textSize--;
      textPaint.setTextSize(textSize);
    }
  }

  //Clients use this to change the displayed text
  public void setOverlayText(String text) {
    this.overlayText = text;
    invalidate();
  }

  //Draws the text onto the SeekBar
  @Override
  protected synchronized void onDraw(Canvas canvas) {
    //Draw everything else (i.e., the usual SeekBar) first
    super.onDraw(canvas);

    //No text, no problem
    if(overlayText.length() == 0) {
      return;
    }

    canvas.save();

    //Here are a few parameters that could be useful in calculating where to put the text
    int width = this.getWidth() - leftPlusRightTextMargins;
    int height = this.getHeight();

    //A somewhat fat finger takes up about seven digits of space 
    // on each side of the thumb; YFMV
    int fatFingerThumbHangover = (int) textPaint.measureText("1234567");

    float textWidth = textPaint.measureText(overlayText);

    int progress = this.getProgress();
    int maxProgress = this.getMax();
    double percentProgress = (double) progress / (double) maxProgress;
    int textHeight = (int) (Math.abs(textPaint.ascent()) + textPaint.descent() + 1);

    int thumbOffset = this.getThumbOffset();

    //These are measured from the point textMargin in from the left of the SeekBarWithText view.
    int middleOfThumbControl = (int) ((double) width * percentProgress); 
    int spaceToLeftOfFatFinger = middleOfThumbControl - fatFingerThumbHangover;
    int spaceToRightOfFatFinger = (width - middleOfThumbControl) - fatFingerThumbHangover; 

    int spaceToLeftOfThumbControl = middleOfThumbControl - thumbOffset;
    int spaceToRightOfThumbControl = (width - middleOfThumbControl) - thumbOffset; 

    int bottomPadding = this.getPaddingBottom();
    int topPadding = this.getPaddingTop();

    //Here you will use the above and possibly other information to decide where you would 
    // like to draw the text.  One policy might be to draw it on the extreme right when the thumb
    // is left of center, and on the extreme left when the thumb is right of center.  These
    // methods will receive any parameters from the above calculations that you need to
    // implement your own policy.
    x = myMethodToSetXPosition();
    y = myMethodToSetYPosition();

    //Finally, just draw the text on top of the SeekBar
    canvas.drawText(overlayText, x, y, textPaint);

    canvas.restore();
  }
}

选中此项，将相对布局的树放置在seekbar的顶部
在这里输入代码

查看此链接，希望您能找到解决问题的方法。谢谢。有一个问题：文本是否正好位于拇指的中间位置：

intmiddleofthumbcontrol=（int）（（double）width*percentProgress）。对于我的垂直搜索杆，它不是。因为100%（百分进度）在seekbar的顶部，但大拇指的中间位置不到顶部（只有大拇指的顶部接触sekbar的顶部），你知道我的意思。我找不到一个适合所有屏幕大小的解决方案，任何帮助都会很棒。@Simon Schubert:我的代码是针对水平搜索杆的；我没试过做垂直的。然而，您描述的问题似乎要求您偏移拇指高度的一半。getThumbOffset（）可能会返回所需的值。如果没有，您可以尝试getThumb（）（它返回一个Drawable），然后检索该Drawable的高度以获得拇指的高度。谢谢Carl。我完全按照你说的做了（我相信），但这让我抓狂。坐标一直有点错。最后，我改写了StestPraseStand方法，并在可绘制的中间绘制文本。感谢您的关注。我在我的应用程序中使用了一种不同的方法，它似乎工作得很好，所以也许你只需要调整一下：我想在seekbar拇指上放置文本。我不能理解你的观点，请将源代码发送给我saiyadamreddy@gmail.com.Please感谢您的帮助。@Gunnar Karlsson您能用完整的解决方案plz更新您的答案吗？这个答案确实有它的优点-但是setThumbPos（）是一个私有方法。你不能在Java中重写私有方法。我做不到。。。似乎更复杂：（请同时解释你做了什么以及这是如何解决问题的。仅仅粘贴一些代码可能会让一些读者感到困惑
public class SeekBarWithText extends SeekBar {

  private static final int textMargin = 6;
  private static final int leftPlusRightTextMargins = textMargin + textMargin;
  private static final int maxFontSize = 18;
  private static final int minFontSize = 10;

  protected String overlayText;
  protected Paint textPaint;

  public SeekBarWithText(Context context) {
    super(context);
    Resources resources = getResources();

    //Set up drawn text attributes here
    textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    textPaint.setTypeface(Typeface.DEFAULT_BOLD);
    textPaint.setTextAlign(Align.LEFT);
  }

  //This attempts to ensure that the text fits inside your SeekBar on a resize
  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    setFontSmallEnoughToFit(w - leftPlusRightTextMargins)));
  }

  //Finds the largest text size that will fit
  protected void setFontSmallEnoughToFit(int width) {
    int textSize = maxTextSize;
    textPaint.setTextSize(textSize);
    while((textPaint.measureText(sampleText) > width) && (textSize > minTextSize)) {
      textSize--;
      textPaint.setTextSize(textSize);
    }
  }

  //Clients use this to change the displayed text
  public void setOverlayText(String text) {
    this.overlayText = text;
    invalidate();
  }

  //Draws the text onto the SeekBar
  @Override
  protected synchronized void onDraw(Canvas canvas) {
    //Draw everything else (i.e., the usual SeekBar) first
    super.onDraw(canvas);

    //No text, no problem
    if(overlayText.length() == 0) {
      return;
    }

    canvas.save();

    //Here are a few parameters that could be useful in calculating where to put the text
    int width = this.getWidth() - leftPlusRightTextMargins;
    int height = this.getHeight();

    //A somewhat fat finger takes up about seven digits of space 
    // on each side of the thumb; YFMV
    int fatFingerThumbHangover = (int) textPaint.measureText("1234567");

    float textWidth = textPaint.measureText(overlayText);

    int progress = this.getProgress();
    int maxProgress = this.getMax();
    double percentProgress = (double) progress / (double) maxProgress;
    int textHeight = (int) (Math.abs(textPaint.ascent()) + textPaint.descent() + 1);

    int thumbOffset = this.getThumbOffset();

    //These are measured from the point textMargin in from the left of the SeekBarWithText view.
    int middleOfThumbControl = (int) ((double) width * percentProgress); 
    int spaceToLeftOfFatFinger = middleOfThumbControl - fatFingerThumbHangover;
    int spaceToRightOfFatFinger = (width - middleOfThumbControl) - fatFingerThumbHangover; 

    int spaceToLeftOfThumbControl = middleOfThumbControl - thumbOffset;
    int spaceToRightOfThumbControl = (width - middleOfThumbControl) - thumbOffset; 

    int bottomPadding = this.getPaddingBottom();
    int topPadding = this.getPaddingTop();

    //Here you will use the above and possibly other information to decide where you would 
    // like to draw the text.  One policy might be to draw it on the extreme right when the thumb
    // is left of center, and on the extreme left when the thumb is right of center.  These
    // methods will receive any parameters from the above calculations that you need to
    // implement your own policy.
    x = myMethodToSetXPosition();
    y = myMethodToSetYPosition();

    //Finally, just draw the text on top of the SeekBar
    canvas.drawText(overlayText, x, y, textPaint);

    canvas.restore();
  }
}

check this put trees of relative layout to put text on top of seekbar

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/relativeLayout0" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button1"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignParentRight="true"
        android:text="Button" />

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button1"
        android:layout_marginBottom="0dp"
        android:layout_toRightOf="@+id/button1" >

        <SeekBar
            android:id="@+id/seekBar1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/seekBar1"
            android:layout_alignParentRight="true"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <RelativeLayout
            android:id="@+id/relativeLayout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true" >
        </RelativeLayout>

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/relativeLayout1"
            android:layout_centerHorizontal="true"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />
    </RelativeLayout>
    enter code here
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"`enter code here`
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="24dp"
        android:text="Button" />

</RelativeLayout>