Java Code Examples for android.text.TextDirectionHeuristics#LTR

public static TextDirectionHeuristic fromTextDirectionHeuristicCompat(
    TextDirectionHeuristicCompat textDirection) {
  if (textDirection == TextDirectionHeuristicsCompat.LTR) {
    return TextDirectionHeuristics.LTR;
  } else if (textDirection == TextDirectionHeuristicsCompat.RTL) {
    return TextDirectionHeuristics.RTL;
  } else if (textDirection == TextDirectionHeuristicsCompat.FIRSTSTRONG_LTR) {
    return TextDirectionHeuristics.FIRSTSTRONG_LTR;
  } else if (textDirection == TextDirectionHeuristicsCompat.FIRSTSTRONG_RTL) {
    return TextDirectionHeuristics.FIRSTSTRONG_RTL;
  } else if (textDirection == TextDirectionHeuristicsCompat.ANYRTL_LTR) {
    return TextDirectionHeuristics.ANYRTL_LTR;
  } else if (textDirection == TextDirectionHeuristicsCompat.LOCALE) {
    return TextDirectionHeuristics.LOCALE;
  } else {
    return TextDirectionHeuristics.FIRSTSTRONG_LTR;
  }
}
 

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public void initLayout(Context context, CharSequence source, CharSequence longString) {

  textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
  textPaint.density = context.getResources().getDisplayMetrics().density;
  textPaint.setTextSize(Util.fromDPtoPix(context, Util.TEXT_SIZE_DP));

  textDir = TextDirectionHeuristics.LTR;

  alignment = Layout.Alignment.ALIGN_NORMAL;

  hardCodeWidth = Util.getScreenWidth(context);

  longStringLayout = new StaticLayout(longString, textPaint, hardCodeWidth, alignment, 1.0f, 0f, true);

  dummyCanvas = new Canvas();

  longStringLayout.draw(dummyCanvas);

  for (int i = 0; i < layout.length; i++) {
    layout[i] = new StaticLayout(TestSpan.getSpanString(i), textPaint, hardCodeWidth, alignment, 1.0f, 0f, true);
    layout[i].draw(dummyCanvas);
  }
}
 

/** A method that allows to create a StaticLayout with maxLines on all supported API levels. */
public StaticLayout build() throws StaticLayoutBuilderCompatException {
  if (source == null) {
    source = "";
  }


  int availableWidth = Math.max(0, width);
  CharSequence textToDraw = source;
  if (maxLines == 1) {
    textToDraw = TextUtils.ellipsize(source, paint, availableWidth, ellipsize);
  }

  end = Math.min(textToDraw.length(), end);
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (isRtl) {
      alignment = Alignment.ALIGN_OPPOSITE;
    }
    // Marshmallow introduced StaticLayout.Builder which allows us not to use
    // the hidden constructor.
    StaticLayout.Builder builder =
        StaticLayout.Builder.obtain(
            textToDraw, start, end, paint, availableWidth);
    builder.setAlignment(alignment);
    builder.setIncludePad(includePad);
    TextDirectionHeuristic textDirectionHeuristic = isRtl
        ? TextDirectionHeuristics.RTL
        : TextDirectionHeuristics.LTR;
    builder.setTextDirection(textDirectionHeuristic);
    if (ellipsize != null) {
      builder.setEllipsize(ellipsize);
    }
    builder.setMaxLines(maxLines);
    return builder.build();
  }

  createConstructorWithReflection();
  // Use the hidden constructor on older API levels.
  try {
    return checkNotNull(constructor)
        .newInstance(
            textToDraw,
            start,
            end,
            paint,
            availableWidth,
            alignment,
            checkNotNull(textDirection),
            1.0f,
            0.0f,
            includePad,
            null,
            availableWidth,
            maxLines);
  } catch (Exception cause) {
    throw new StaticLayoutBuilderCompatException(cause);
  }
}
 

/**
 * set constructor to this hidden {@link StaticLayout constructor.}
 *
 * <pre>{@code
 * StaticLayout(
 *   CharSequence source,
 *   int bufstart,
 *   int bufend,
 *   TextPaint paint,
 *   int outerwidth,
 *   Alignment align,
 *   TextDirectionHeuristic textDir,
 *   float spacingmult,
 *   float spacingadd,
 *   boolean includepad,
 *   TextUtils.TruncateAt ellipsize,
 *   int ellipsizedWidth,
 *   int maxLines)
 * }</pre>
 */
private void createConstructorWithReflection() throws StaticLayoutBuilderCompatException {
  if (initialized) {
    return;
  }

  try {
    final Class<?> textDirClass;
    boolean useRtl = isRtl && Build.VERSION.SDK_INT >= VERSION_CODES.M;
    if (Build.VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2) {
      textDirClass = TextDirectionHeuristic.class;
      textDirection = useRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR;
    } else {
      ClassLoader loader = StaticLayoutBuilderCompat.class.getClassLoader();
      String textDirClassName = isRtl ? TEXT_DIR_CLASS_RTL : TEXT_DIR_CLASS_LTR;
      textDirClass = loader.loadClass(TEXT_DIR_CLASS);
      Class<?> textDirsClass = loader.loadClass(TEXT_DIRS_CLASS);
      textDirection = textDirsClass.getField(textDirClassName).get(textDirsClass);
    }

    final Class<?>[] signature =
        new Class<?>[] {
          CharSequence.class,
          int.class,
          int.class,
          TextPaint.class,
          int.class,
          Alignment.class,
          textDirClass,
          float.class,
          float.class,
          boolean.class,
          TextUtils.TruncateAt.class,
          int.class,
          int.class
        };

    constructor = StaticLayout.class.getDeclaredConstructor(signature);
    constructor.setAccessible(true);
    initialized = true;
  } catch (Exception cause) {
    throw new StaticLayoutBuilderCompatException(cause);
  }
}
 

@TargetApi(JELLY_BEAN_MR1)
@CheckResult
private boolean needMirroring() {
    if (!mirrorable) return false;

    // Passwords fields should be LTR
    if (view.getTransformationMethod() instanceof PasswordTransformationMethod) {
        return false;
    }

    // Always need to resolve layout direction first
    final boolean defaultIsRtl = view.getLayoutDirection() == LAYOUT_DIRECTION_RTL;

    if (SDK_INT < JELLY_BEAN_MR2) {
        return defaultIsRtl;
    }

    // Select the text direction heuristic according to the
    // package-private getTextDirectionHeuristic() method in TextView
    TextDirectionHeuristic textDirectionHeuristic;
    switch (view.getTextDirection()) {
        default:
        case TEXT_DIRECTION_FIRST_STRONG:
            textDirectionHeuristic = defaultIsRtl ?
                    TextDirectionHeuristics.FIRSTSTRONG_RTL :
                    TextDirectionHeuristics.FIRSTSTRONG_LTR;
            break;
        case TEXT_DIRECTION_ANY_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.ANYRTL_LTR;
            break;
        case TEXT_DIRECTION_LTR:
            textDirectionHeuristic = TextDirectionHeuristics.LTR;
            break;
        case TEXT_DIRECTION_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.RTL;
            break;
        case TEXT_DIRECTION_LOCALE:
            textDirectionHeuristic = TextDirectionHeuristics.LOCALE;
            break;
        case TEXT_DIRECTION_FIRST_STRONG_LTR:
            textDirectionHeuristic = TextDirectionHeuristics.FIRSTSTRONG_LTR;
            break;
        case TEXT_DIRECTION_FIRST_STRONG_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.FIRSTSTRONG_RTL;
            break;
    }
    CharSequence text = view.getText();
    return textDirectionHeuristic.isRtl(text, 0, text.length());
}