android.graphics.BlurMaskFilter#Blur ( )源码实例Demo

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_blur_mask_filter);

  LinearLayout container = (LinearLayout) findViewById(R.id.container);
  for (BlurMaskFilter.Blur style : BlurMaskFilter.Blur.values()) {
    TextView textView = new TextView(this);
    textView.setTextAppearance(this, R.style.TextAppearance_Huge_Green);
    applyFilter(textView, style);

    LinearLayout.LayoutParams params =  new LinearLayout.LayoutParams(
        ViewGroup.LayoutParams.WRAP_CONTENT,
        ViewGroup.LayoutParams.WRAP_CONTENT);
    params.gravity = Gravity.CENTER;
    container.addView(textView, params);
  }
}
 

/**
 * @see BlurMaskFilter#BlurMaskFilter(float, BlurMaskFilter.Blur)
 */
public static Span blur(final float radius, @NonNull final BlurMaskFilter.Blur style) {
    return new Span(new SpanBuilder() {
        @Override
        public Object build() {
            return new MaskFilterSpan(new BlurMaskFilter(radius, style));
        }
    });
}
 

public TextDecorator blur(final float radius, final BlurMaskFilter.Blur style, final String... texts) {
  int index;

  for (String text : texts) {
    if (content.contains(text)) {
      index = content.indexOf(text);
      decoratedContent.setSpan(new MaskFilterSpan(new BlurMaskFilter(radius, style)), index, index + text.length(), flags);
    }
  }

  return this;
}
 

/**
 * Exposing method to add or remove blur mask filter to ticker text.
 *
 * @param style Blur mask filter type
 * @param radius Density of filter
 */
public void setBlurMaskFilter(BlurMaskFilter.Blur style, float radius) {
    if (style != null && radius > 0f) {
        BlurMaskFilter filter = new BlurMaskFilter(radius, style);
        textPaint.setMaskFilter(filter);
    } else {
        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        textPaint.setMaskFilter(null);
    }
}
 

private void applyFilter(
    TextView textView, BlurMaskFilter.Blur style) {
  if (Build.VERSION.SDK_INT >= 11) {
    ViewUtil.setSoftwareLayerType(textView);
  }
  textView.setText(style.name());
  BlurMaskFilter filter = new BlurMaskFilter(textView.getTextSize() / 10, style);
  textView.getPaint().setMaskFilter(filter);
}
 

public TextDecorator blur(final float radius, final BlurMaskFilter.Blur style, final int start, final int end) {
  checkIndexOutOfBoundsException(start, end);
  decoratedContent.setSpan(new MaskFilterSpan(new BlurMaskFilter(radius, style)), start, end, flags);

  return this;
}
 

/**
 * @param density
 * @param style   BlurMaskFilter.Blur.NORMAL
 * @return
 */
public SpanOptions addMaskFilterSpan(float density, BlurMaskFilter.Blur style) {
    MaskFilterSpan span = new MaskFilterSpan(new BlurMaskFilter(density, style));
    listSpan.add(span);
    return this;
}
 

/**
 * 设置模糊
 * <p>尚存bug，其他地方存在相同的字体的话，相同字体出现在之前的话那么就不会模糊，出现在之后的话那会一起模糊</p>
 * <p>推荐还是把所有字体都模糊这样使用</p>
 *
 * @param radius 模糊半径（需大于0）
 * @param style  模糊样式<ul>
 *               <li>{@link BlurMaskFilter.Blur#NORMAL}</li>
 *               <li>{@link BlurMaskFilter.Blur#SOLID}</li>
 *               <li>{@link BlurMaskFilter.Blur#OUTER}</li>
 *               <li>{@link BlurMaskFilter.Blur#INNER}</li>
 *               </ul>
 * @return {@link Builder}
 */
public Builder setBlur(float radius, BlurMaskFilter.Blur style) {
    this.blurRadius = radius;
    this.style = style;
    this.isBlur = true;
    return this;
}
 

/**
 * 设置模糊
 * @param radius 模糊程度
 * @param style  模糊样式
 *               <ul>
 *               <li>{@link BlurMaskFilter.Blur#NORMAL}</li>
 *               <li>{@link BlurMaskFilter.Blur#SOLID}</li>
 *               <li>{@link BlurMaskFilter.Blur#OUTER}</li>
 *               <li>{@link BlurMaskFilter.Blur#INNER}</li>
 *               </ul>
 * @return {@link SpannableStringUtils}
 */
public SpannableStringUtils setBlur(@FloatRange(from = 0, fromInclusive = false) final float radius,
                                    final BlurMaskFilter.Blur style) {
    this.blurRadius = radius;
    this.style = style;
    return this;
}
 

/**
 * 设置模糊
 * <p>尚存bug，其他地方存在相同的字体的话，相同字体出现在之前的话那么就不会模糊，出现在之后的话那会一起模糊</p>
 * <p>推荐还是把所有字体都模糊这样使用</p>
 *
 * @param radius 模糊半径（需大于0）
 * @param style  模糊样式<ul>
 *               <li>{@link BlurMaskFilter.Blur#NORMAL}</li>
 *               <li>{@link BlurMaskFilter.Blur#SOLID}</li>
 *               <li>{@link BlurMaskFilter.Blur#OUTER}</li>
 *               <li>{@link BlurMaskFilter.Blur#INNER}</li>
 *               </ul>
 * @return {@link Builder}
 */
public Builder setBlur(float radius, BlurMaskFilter.Blur style) {
    this.blurRadius = radius;
    this.style = style;
    this.isBlur = true;
    return this;
}
 

/**
 * 模糊效果
 *
 * @param text
 * @param density
 * @param style   BlurMaskFilter.Blur.NORMAL
 * @return
 */
public AndroidSpan drawMaskFilterSpan(String text, float density, BlurMaskFilter.Blur style) {
    MaskFilterSpan span = new MaskFilterSpan(new BlurMaskFilter(density, style));
    drawSpan(text, span);
    return this;
}