How to layout text to flow around an image

Solution 1:

Now it is possible, but only for phones with version higher or equal 2.2 by using the android.text.style.LeadingMarginSpan.LeadingMarginSpan2 interface which is available in API 8.

Here is the article, not in English though, but you can download the source code of the example directly from here.

If you want to make your application compatible with older devices, you can display a different layout without a floating text. Here is an example:

Layout (default for older versions, will be changed programmatically for newer versions)

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
    <ImageView 
            android:id="@+id/thumbnail_view"
            android:src="@drawable/icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    <TextView android:id="@+id/message_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/thumbnail_view"
            android:textSize="18sp"
            android:text="@string/text" />
</RelativeLayout>

The helper class

class FlowTextHelper {

    private static boolean mNewClassAvailable;

    static {
        if (Integer.parseInt(Build.VERSION.SDK) >= 8) { // Froyo 2.2, API level 8
           mNewClassAvailable = true;
        }
    }

    public static void tryFlowText(String text, View thumbnailView, TextView messageView, Display display){
        // There is nothing I can do for older versions, so just return
        if(!mNewClassAvailable) return;

        // Get height and width of the image and height of the text line
        thumbnailView.measure(display.getWidth(), display.getHeight());
        int height = thumbnailView.getMeasuredHeight();
        int width = thumbnailView.getMeasuredWidth();
        float textLineHeight = messageView.getPaint().getTextSize();

        // Set the span according to the number of lines and width of the image
        int lines = (int)FloatMath.ceil(height / textLineHeight);
        //For an html text you can use this line: SpannableStringBuilder ss = (SpannableStringBuilder)Html.fromHtml(text);
        SpannableString ss = new SpannableString(text);
        ss.setSpan(new MyLeadingMarginSpan2(lines, width), 0, ss.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        messageView.setText(ss);

        // Align the text with the image by removing the rule that the text is to the right of the image
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)messageView.getLayoutParams();
        int[]rules = params.getRules();
        rules[RelativeLayout.RIGHT_OF] = 0;
    }
}

The MyLeadingMarginSpan2 class (updated to support API 21)

public class MyLeadingMarginSpan2 implements LeadingMarginSpan2 {
    private int margin;
    private int lines;
    private boolean wasDrawCalled = false;
    private int drawLineCount = 0;

    public MyLeadingMarginSpan2(int lines, int margin) {
        this.margin = margin;
        this.lines = lines;
    }

    @Override
    public int getLeadingMargin(boolean first) {
        boolean isFirstMargin = first;
        // a different algorithm for api 21+
        if (Build.VERSION.SDK_INT >= 21) {
            this.drawLineCount = this.wasDrawCalled ? this.drawLineCount + 1 : 0;
            this.wasDrawCalled = false;
            isFirstMargin = this.drawLineCount <= this.lines;
        }

        return isFirstMargin ? this.margin : 0;
    }

    @Override
    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir, int top, int baseline, int bottom, CharSequence text, int start, int end, boolean first, Layout layout) {
        this.wasDrawCalled = true;
    }

    @Override
    public int getLeadingMarginLineCount() {
        return this.lines;
    }
}

Example of the usage

ImageView thumbnailView = (ImageView) findViewById(R.id.thumbnail_view);
TextView messageView = (TextView) findViewById(R.id.message_view);
String text = getString(R.string.text);

Display display = getWindowManager().getDefaultDisplay();
FlowTextHelper.tryFlowText(text, thumbnailView, messageView, display);

This is how the application looks on the Android 2.2 device:

And this is for the Android 2.1 device:

Solution 2:

Nowadays you can use library: https://github.com/deano2390/FlowTextView . Like this:

<uk.co.deanwild.flowtextview.FlowTextView
    android:id="@+id/ftv"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:padding="10dip"
            android:src="@drawable/android"/>
</uk.co.deanwild.flowtextview.FlowTextView>

Solution 3:

Here's an improvement for the FlowTextHelper (from vorrtex's reply). I added the possibility to add extra padding between the text and the image and improved the line calculation to also take padding into account. Enjoy!

public class FlowTextHelper {
   private static boolean mNewClassAvailable;

   /* class initialization fails when this throws an exception */
   static {
       try {
           Class.forName("android.text.style.LeadingMarginSpan$LeadingMarginSpan2");
           mNewClassAvailable = true;
       } catch (Exception ex) {
           mNewClassAvailable = false;
       }
   }

   public static void tryFlowText(String text, View thumbnailView, TextView messageView, Display display, int addPadding){
       // There is nothing I can do for older versions, so just return
       if(!mNewClassAvailable) return;



       // Get height and width of the image and height of the text line
        thumbnailView.measure(display.getWidth(), display.getHeight());
        int height = thumbnailView.getMeasuredHeight();
        int width = thumbnailView.getMeasuredWidth() + addPadding;
        messageView.measure(width, height); //to allow getTotalPaddingTop
        int padding = messageView.getTotalPaddingTop();
        float textLineHeight = messageView.getPaint().getTextSize();

        // Set the span according to the number of lines and width of the image
        int lines =  (int)Math.round((height - padding) / textLineHeight);
        SpannableString ss = new SpannableString(text);
        //For an html text you can use this line: SpannableStringBuilder ss = (SpannableStringBuilder)Html.fromHtml(text);
        ss.setSpan(new MyLeadingMarginSpan2(lines, width), 0, ss.length(), 0);
        messageView.setText(ss);

        // Align the text with the image by removing the rule that the text is to the right of the image
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)messageView.getLayoutParams();
        int[]rules = params.getRules();
        rules[RelativeLayout.RIGHT_OF] = 0;
   }


}

Solution 4:

Vorrtex and Ronen's answers are working for me except for one detail - After wrapping text around the image there was a weird "negative" margin below the image and on the opposite side. I figured out that when setting the span on the SpannableString I changed

ss.setSpan(new MyLeadingMarginSpan2(lines, width), 0, ss.length(), 0);

to

ss.setSpan(new MyLeadingMarginSpan2(lines, width), 0, lines, 0);

which stopped the span after the image. Might not be necessary in all cases but thought I would share.

Solution 5:

This question seems to same as my question How to fill the empty spaces with content below the Image in android

I found the solution using flowtext library please find the first answer it might help you so far