Format Presentation Text on Android

Overview

This article shows how to format text in PowerPoint and OpenDocument presentations using Aspose.Slides for Android via Java. It covers highlighting, background colors, transparency, character spacing, font properties, rotation, paragraph spacing, autofit behavior, text anchoring, tab stops, and language settings.

In the examples below, we’ll use a file named “sample.pptx”, which contains a single text box on the first slide with the following text:

Highlight Text

Use the ITextFrame.highlightText method when you need to highlight text that matches a specific sample within a text frame. The method applies a highlight color to matching text fragments and can be used with ITextSearchOptions to control how the search is performed, for example, to match only whole words.

The code example below highlights all occurrences of the characters “try” and then highlights only the full word “to”.

Presentation presentation = new Presentation("sample.pptx");
try {
    // Get the first shape from the first slide.
    IAutoShape shape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    // Highlight the word "try" in the shape.
    shape.getTextFrame().highlightText("try", Color.rgb(173, 216, 230));

    TextSearchOptions searchOptions = new TextSearchOptions();
    searchOptions.setWholeWordsOnly(true);

    // Highlight the word "to" in the shape.
    int violetColor = Color.rgb(238, 130, 238);
    shape.getTextFrame().highlightText("to", violetColor, searchOptions, null);

    presentation.save("highlighted_text.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Highlight Text Using Regular Expressions

The ITextFrame.highlightRegex method highlights text matches found by a regular expression.

The code example below highlights all words that contain seven or more characters:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape shape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    java.util.regex.Pattern regex = java.util.regex.Pattern.compile("\\b[^\\s]{7,}\\b");

    // Highlight all words with seven or more characters.
    shape.getTextFrame().highlightRegex(regex, Color.YELLOW, null);

    presentation.save("highlighted_text_using_regex.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Text Background Color

Use IParagraphFormat.getDefaultPortionFormat to set the default highlight color for a paragraph, or use IBasePortionFormat.getHighlightColor for individual text portions.

The following code example shows how to set the background color for the entire paragraph:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    // Set the highlight color for the entire paragraph.
    paragraph.getParagraphFormat().getDefaultPortionFormat().getHighlightColor().setColor(Color.LTGRAY);

    presentation.save("gray_paragraph.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

The code example below demonstrates how to set the background color for text portions with a bold font:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    for (int portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
        IPortion portion = paragraph.getPortions().get_Item(portionIndex);

        if (portion.getPortionFormat().getEffective().getFontBold()) {
            // Set the highlight color for the text portion.
            portion.getPortionFormat().getHighlightColor().setColor(Color.LTGRAY);
        }
    }

    presentation.save("gray_text_portions.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Align Text Paragraphs

Use IParagraphFormat.setAlignment to set paragraph alignment within a text frame. The value can be centered, left-aligned, right-aligned, justified, and so on.

The following code example shows how to align the paragraph to the center:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    // Set the alignment of the paragraph to center.
    paragraph.getParagraphFormat().setAlignment(TextAlignment.Center);

    presentation.save("aligned_paragraph.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Transparency for Text

Text transparency is controlled through the alpha component of the color assigned to IBasePortionFormat.getFillFormat. In the examples below, alpha = 50 is an ARGB alpha-channel value on the 0-255 scale, not a transparency percentage.

The code example below shows how to apply transparency to the entire paragraph:

int alpha = 50;

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    // Set the fill color of the text to transparent color.
    paragraph.getParagraphFormat().getDefaultPortionFormat().getFillFormat().setFillType(FillType.Solid);
    paragraph.getParagraphFormat().getDefaultPortionFormat().getFillFormat().getSolidFillColor().setColor(Color.argb(alpha, 0, 0, 0));

    presentation.save("transparent_paragraph.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

The following code example shows how to apply transparency to text portions with a bold font:

int alpha = 50;

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    for (int portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
        IPortion portion = paragraph.getPortions().get_Item(portionIndex);

        if (portion.getPortionFormat().getEffective().getFontBold()) {
            // Set the transparency of the text portion.
            portion.getPortionFormat().getFillFormat().setFillType(FillType.Solid);
            portion.getPortionFormat().getFillFormat().getSolidFillColor().setColor(Color.argb(alpha, 0, 0, 0));
        }
    }

    presentation.save("transparent_text_portions.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Character Spacing for Text

Use IBasePortionFormat.setSpacing to expand or condense spacing between characters in a text box.

The following Java code shows how to expand the character spacing in the entire paragraph:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    // Note: Use negative values to compress the character spacing.
    paragraph.getParagraphFormat().getDefaultPortionFormat().setSpacing(3); // Expand character spacing.

    presentation.save("character_spacing_in_paragraph.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

The code example below shows how to expand the character spacing in text portions with a bold font:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    for (int portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
        IPortion portion = paragraph.getPortions().get_Item(portionIndex);

        if (portion.getPortionFormat().getEffective().getFontBold()) {
            // Note: Use negative values to compress the character spacing.
            portion.getPortionFormat().setSpacing(3); // Expand character spacing.
        }
    }

    presentation.save("character_spacing_in_text_portions.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Disable Kerning for Specific Fonts

In some cases, text rendered by Aspose.Slides may look slightly tighter than the same text displayed in PowerPoint. This can happen because PowerPoint may ignore kerning data for certain fonts, even when the font contains valid kerning information and kerning is enabled in PowerPoint settings.

To make the rendered output closer to PowerPoint in such cases, you can disable kerning for text portions that use the affected font. Set IBasePortionFormat.setKerningMinimalSize to a value significantly larger than the actual font size:

Presentation presentation = new Presentation("presentation.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    String targetFont = "Roboto";

    for (int paragraphIndex = 0; paragraphIndex < autoShape.getTextFrame().getParagraphs().getCount(); paragraphIndex++) {
        IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(paragraphIndex);

        for (int portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
            IPortion portion = paragraph.getPortions().get_Item(portionIndex);
            IFontData latinFont = portion.getPortionFormat().getLatinFont();
            IFontData eastAsianFont = portion.getPortionFormat().getEastAsianFont();
            IFontData complexScriptFont = portion.getPortionFormat().getComplexScriptFont();

            boolean usesTargetFont =
                    latinFont != null && targetFont.equals(latinFont.getFontName()) ||
                    eastAsianFont != null && targetFont.equals(eastAsianFont.getFontName()) ||
                    complexScriptFont != null && targetFont.equals(complexScriptFont.getFontName());

            if (usesTargetFont) {
                portion.getPortionFormat().setKerningMinimalSize(100);
            }
        }
    }

    presentation.save("output.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

This setting prevents kerning from being applied to matching text portions and can help align Aspose.Slides rendering with PowerPoint’s visual output for fonts affected by this PowerPoint-specific behavior.

Manage Text Font Properties

Font properties can be set at the paragraph level through IParagraphFormat.getDefaultPortionFormat or on individual portions through IPortionFormat.

The following code sets the font and text style for the entire paragraph: it applies font size, bold, italic, dotted underline, and the Times New Roman font to all portions in the paragraph.

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    // Set the font properties for the paragraph.
    paragraph.getParagraphFormat().getDefaultPortionFormat().setFontHeight(12);
    paragraph.getParagraphFormat().getDefaultPortionFormat().setFontBold(NullableBool.True);
    paragraph.getParagraphFormat().getDefaultPortionFormat().setFontItalic(NullableBool.True);
    paragraph.getParagraphFormat().getDefaultPortionFormat().setFontUnderline(TextUnderlineType.Dotted);
    paragraph.getParagraphFormat().getDefaultPortionFormat().setLatinFont(new FontData("Times New Roman"));

    presentation.save("font_properties_for_paragraph.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

The code example below applies similar properties to text portions with a bold font:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    for (int portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
        IPortion portion = paragraph.getPortions().get_Item(portionIndex);

        if (portion.getPortionFormat().getEffective().getFontBold()) {
            // Set the font properties for the text portion.
            portion.getPortionFormat().setFontHeight(13);
            portion.getPortionFormat().setFontItalic(NullableBool.True);
            portion.getPortionFormat().setFontUnderline(TextUnderlineType.Dotted);
            portion.getPortionFormat().setLatinFont(new FontData("Times New Roman"));
        }
    }

    presentation.save("font_properties_for_text_portions.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Text Rotation

Use ITextFrameFormat.setTextVerticalType to set a predefined text orientation within a shape.

The following code example sets the text orientation in the shape to Vertical270, which rotates the text 90 degrees counterclockwise:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    autoShape.getTextFrame().getTextFrameFormat().setTextVerticalType(TextVerticalType.Vertical270);

    presentation.save("text_rotation.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Custom Rotation for Text Frames

Use ITextFrameFormat.setRotationAngle to set a custom rotation angle for an ITextFrame.

The code example below rotates the text frame by 3 degrees clockwise within the shape:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    autoShape.getTextFrame().getTextFrameFormat().setRotationAngle(3);

    presentation.save("custom_text_rotation.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Line Spacing of Paragraphs

Aspose.Slides provides IParagraphFormat.setSpaceAfter, IParagraphFormat.setSpaceBefore, and IParagraphFormat.setSpaceWithin to control paragraph spacing. These properties are used as follows:

• Use a positive value to specify line spacing as a percentage of the line height.
• Use a negative value to specify line spacing in points.

The following code example shows how to specify the line spacing within the paragraph:

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    paragraph.getParagraphFormat().setSpaceWithin(200);

    presentation.save("line_spacing.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Autofit Type for Text Frames

ITextFrameFormat.setAutofitType determines how text behaves when it exceeds the boundaries of its container. Use it to control whether the text shrinks, overflows, or resizes the shape automatically.

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    autoShape.getTextFrame().getTextFrameFormat().setAutofitType(TextAutofitType.Shape);

    presentation.save("autofit_type.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Set Anchor of Text Frames

ITextFrameFormat.setAnchoringType defines how text is positioned vertically inside a shape, for example at the top, middle, or bottom.

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    autoShape.getTextFrame().getTextFrameFormat().setAnchoringType(TextAnchorType.Bottom);

    presentation.save("text_anchor.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Set Text Tabulation

Use IParagraphFormat.setDefaultTabSize and IParagraphFormat.getTabs to configure tab stops in a paragraph.

Presentation presentation = new Presentation("sample.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    paragraph.getParagraphFormat().setDefaultTabSize(100);
    paragraph.getParagraphFormat().getTabs().add(30, TabAlignment.Left);

    presentation.save("paragraph_tabs.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The result:

Set Proofing Language

Aspose.Slides provides IBasePortionFormat.setLanguageId, which allows you to set the proofing language for a text portion. The proofing language determines the language used for spelling and grammar checks in PowerPoint.

The following code example shows how to set the proofing language for a text portion:

Presentation presentation = new Presentation("presentation.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);

    IParagraph paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);
    paragraph.getPortions().clear();

    FontData font = new FontData("SimSun");

    Portion textPortion = new Portion();
    textPortion.getPortionFormat().setComplexScriptFont(font);
    textPortion.getPortionFormat().setEastAsianFont(font);
    textPortion.getPortionFormat().setLatinFont(font);

    // Set the ID of a proofing language.
    textPortion.getPortionFormat().setLanguageId("zh-CN");

    textPortion.setText("1。");
    paragraph.getPortions().add(textPortion);

    presentation.save("proofing_language.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Set Default Language

Use LoadOptions.setDefaultTextLanguage to define the default language for text created while loading or creating a presentation.

LoadOptions loadOptions = new LoadOptions();
loadOptions.setDefaultTextLanguage("en-US");

Presentation presentation = new Presentation(loadOptions);
try {
    ISlide slide = presentation.getSlides().get_Item(0);

    // Add a new rectangle shape with text.
    IAutoShape shape = slide.getShapes().addAutoShape(ShapeType.Rectangle, 20, 20, 150, 50);
    shape.getTextFrame().setText("Sample text");

    // Check the first portion language.
    IPortion portion = shape.getTextFrame().getParagraphs().get_Item(0).getPortions().get_Item(0);
    System.out.println(portion.getPortionFormat().getLanguageId());
} finally {
    presentation.dispose();
}

Set Default Text Style

To apply default text formatting at the presentation level, use IPresentation.getDefaultTextStyle.

The following code example shows how to set a default bold font with a 14 pt size for all text across slides in a new presentation.

Presentation presentation = new Presentation();
try {
    // Get the top level paragraph format.
    IParagraphFormat paragraphFormat = presentation.getDefaultTextStyle().getLevel(0);

    if (paragraphFormat != null) {
        paragraphFormat.getDefaultPortionFormat().setFontHeight(14);
        paragraphFormat.getDefaultPortionFormat().setFontBold(NullableBool.True);
    }

    presentation.save("default_text_style.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Extract Text with the All-Caps Effect

In PowerPoint, applying the All Caps font effect makes text appear in uppercase on the slide even when it was originally typed in lowercase. When you retrieve such a text portion with Aspose.Slides, the library returns the text exactly as it was entered. To match the displayed text, check TextCapType and convert the returned string to uppercase when the value is All.

Let’s say we have the following text box on the first slide of the sample2.pptx file.

The code example below shows how to extract the text with the All Caps effect applied:

Presentation presentation = new Presentation("sample2.pptx");
try {
    IAutoShape autoShape = (IAutoShape) presentation.getSlides().get_Item(0).getShapes().get_Item(0);
    IPortion textPortion = autoShape.getTextFrame().getParagraphs().get_Item(0).getPortions().get_Item(0);

    System.out.println("Original text: " + textPortion.getText());

    IPortionFormatEffectiveData textFormat = textPortion.getPortionFormat().getEffective();
    if (textFormat.getTextCapType() == TextCapType.All) {
        String text = textPortion.getText().toUpperCase();
        System.out.println("All-Caps effect: " + text);
    }
} finally {
    presentation.dispose();
}

Output:

Original text: Hello, Aspose!
All-Caps effect: HELLO, ASPOSE!

FAQ

How to modify text in a table on a slide?

To modify text in a table on a slide, use ITable. Iterate through the cells and update each cell through ICell.getTextFrame and paragraph formatting through IParagraph.getParagraphFormat.

How to apply gradient color to text in a PowerPoint slide?

To apply a gradient color to text, use IBasePortionFormat.getFillFormat. Set IFillFormat.setFillType to FillType.Gradient and configure the gradient stops, direction, and transparency.