Android Custom TextView Sliding Unlock Highlight Text

The following 1 code to share Android custom TextView to achieve sliding unlocking highlight text effect, the specific code is as follows:

public class HightLightTextView extends TextView {
  //  Storage view Width of  
  private int mTextViewWidth = 0;
  //  Paintbrush  
  private Paint mPaint;
  //  Linear rendering  
  private LinearGradient mLinearGradient;
  //  Storage transformed matrix 
  private Matrix matrix;
  //  Moving distance  
  private int mTranslateX = 0;
  //  Construction method  
  public HightLightTextView(Context context) {
    this(context, null);
  }
  public HightLightTextView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }
  public HightLightTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }
  /**
   * view Call procedure of : Construction method ->onFinishInflate->onSizeChanged->onDraw
   */
  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    //  Get view Initial properties such as the width of the, initialization brush, and so on  
    if (mTextViewWidth == 0) {
      mTextViewWidth = getMeasuredWidth();
      //  If the width is greater than 0 Initializes the  
      if (mTextViewWidth > 0) {
        //  Initialize brush  
        mPaint = getPaint();
        //  Linear rendering  
        mLinearGradient = new LinearGradient(0, getMeasuredHeight(), mTextViewWidth, 0,
            new int[]{0X55FFFFFF, 0XFFFFFFFF, 0X55FFFFFF},
            new float[]{0, 0.5f, 1}, Shader.TileMode.CLAMP);
        mPaint.setShader(mLinearGradient);
        matrix = new Matrix();
      }
    }
  }
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (matrix != null) {
      mTranslateX += mTextViewWidth / 10;
      //  If you move more than twice the width, start moving again  
      if (mTranslateX > 2 * mTextViewWidth) {
        mTranslateX = -mTextViewWidth;
      }
      //  Translation matrix 
      matrix.setTranslate(mTranslateX, 0);
      //  Set linearly varying matrix 
      mLinearGradient.setLocalMatrix(matrix);
      //  Delay 50ms Redraw  ( Will be called again when redrawing onDraw)
      postInvalidateDelayed(50);
    }
  }
}

Additional:

Android TextView Specify Key Highlight

There is this requirement in the project. I searched one on the Internet, and there are many methods. Here, I choose a simple and verified available method, and record it for later reference.

TextView tv = (TextView) findViewById(R.id.hello); 
SpannableString s = new SpannableString(getResources().getString(R.string.linkify)); 
Pattern p = Pattern.compile("abc"); 
Matcher m = p.matcher(s); 
while (m.find()) { 
int start = m.start(); 
int end = m.end(); 
s.setSpan(new ForegroundColorSpan(Color.RED), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); 
} 
tv.setText(s); 

Quite simply, tv is the TextView control, s is the string to display, and "abc" is the keyword to highlight.