Android 自定义TextView实现滑动解锁高亮文字

public class HightLightTextView extends TextView {  // 存储view的宽度   private int mTextViewWidth = 0;  // 画笔   private Paint mPaint;  // 线性渲染   private LinearGradient mLinearGradient;  // 存储变换的matrix   private Matrix matrix;  // 移动距离   private int mTranslateX = 0;  // 构造方法   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的调用过程:构造方法->onFinishInflate->onSizeChanged->onDraw   */  @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    // 获取view的宽度，初始化画笔等初始属性     if (mTextViewWidth == 0) {      mTextViewWidth = getMeasuredWidth();      // 如果宽度大于0的话，则初始化       if (mTextViewWidth > 0) {        // 初始化画笔         mPaint = getPaint();        // 线性渲染         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;      // 如果移动的距离大于两倍的宽度，则重新开始移动       if (mTranslateX > 2 * mTextViewWidth) {        mTranslateX = -mTextViewWidth;      }      // 平移matrix       matrix.setTranslate(mTranslateX, 0);      // 设置线性变化的matrix       mLinearGradient.setLocalMatrix(matrix);      // 延迟50ms重绘 (重绘时会重新调用onDraw)      postInvalidateDelayed(50);    }  }}

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);