How to get textview to display at most

    /**
      * Get the maximum number of words to display in textview
      * @param text text content
      * @param size Text font size
      * @param maxWidth maximum width of textview
      * @return
      */
    private float getLineMaxNumber(String text, float size,float maxWidth) {
        if (null == text || "".equals(text)){
            return 0;
        }
        Paint paint = new Paint();
        (size);
        //Get the overall length of the text content        float textWidth = (text);
        // textWidth
        float width = textWidth / ();
        float total = maxWidth / width;
        return total;
    }

/**
      * Get the maximum number of words that can be displayed in a line of textview (need to be after the TextView measurement is completed)
      *
      * @param text text content
      * @param paint ()
      * @param maxWidth ()/or is the specified value, such as 200dp
      */
    private int getLineMaxNumber(String text, TextPaint paint, int maxWidth) {
        if (null == text || "".equals(text)) {
            return 0;
        }
        StaticLayout staticLayout = new StaticLayout(text, paint, maxWidth, .ALIGN_NORMAL
                , 1.0f, 0, false);
        //Get the character subscript displayed at the last line        return (0);
    }

  <TextView
        android:
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:singleLine="true" />

String str = "If you really want to hear about it, the first thing you'll probably want to know";
This will lead to incomplete display，Like this：
If you really want to hear about it, the first thin...

so，If you want to get the number of characters that have been displayed，Or the number of characters not displayed，Then the key is how to calculate the width of each character。
Then iterate through this string，currentnThe sum of the widths of each character，ExceedTextViewWhen width，You get the displayed number of characters。

String str = "If you really want to hear about it, the first thing you'll probably want to know";
mTextView = (TextView) findViewById();

// Calculate TextView width: the width defined in xml is 300dp, convert it to pxfloat textViewWidth = convertDpToPixel(300);
float dotWidth = getCharWidth(mTextView, '.');
(TAG, "TextView width " + textViewWidth);

int sumWidth = 0;
for (int index=0; index<(); index++) {
    // Calculate the width of each character    char c = (index);
    float charWidth = getCharWidth(mTextView, c);
    sumWidth += charWidth;
    (TAG, "#" + index + ": " + c + ", width=" + charWidth + ", sum=" + sumWidth);
    
    if (sumWidth + dotWidth*3 >= textViewWidth) {
        (TAG, "TextView shows #" + index + " char: " + (0, index));
        break;
    }
}

// Dp to Pxprivate float convertDpToPixel(float dp){
    Resources resources = getResources();
    DisplayMetrics metrics = ();
    float px = dp * ( / 160f);
    return px;
}

// Calculate the width of each characterpublic float getCharWidth(TextView textView, char c) {
    ((c));
    (0, 0);
    return ();
}