Align 2 texts, 1 normal, 1 opposite

alignment, android, java, spannablestring

Solution

Well, if you can't make the move from `Button` to a `ViewGroup`, here's what you can do in your extended Button class:

Remove:

setText(item.title + " " + item.roomId + "\n" + item.teacher + " "
            + item.classes);

Add the following to `ScheduleItemView's` constructor:

float[] fl1 = new float[item.title.length()];
getPaint().getTextWidths(item.title, fl1);

float[] fl2 = new float[item.roomId.length()];
getPaint().getTextWidths(item.roomId, fl2);

float[] fl3 = new float[item.teacher.length() + item.classes.length() + 1];
getPaint().getTextWidths(item.teacher + " " + item.classes, fl3);

float differenceInWidth = sumUpTheArray(fl3) 
                          - sumUpTheArray(fl1) 
                          - sumUpTheArray(fl2);

float fSpaceArray[] = new float[1];

getPaint().getTextWidths(" ", fSpaceArray);

int numOfSpaces = (int) (differenceInWidth / fSpaceArray[0]);

char[] spaceCharArr = new char[numOfSpaces];

Arrays.fill(spaceCharArr, ' ');

setText(item.title + String.valueOf(spaceCharArr) + item.roomId + "\n" 
                            + item.teacher + " " + item.classes);

Add this helper method which sums up a `float` array:

public float sumUpTheArray(float[] arr) {
    float sum = 0f;

    for (int i = 0; i < arr.length; i++) {
        sum += arr[i];
    }

    return sum;
}

Not sure why you're overriding the `onDraw(Canvas)` and `onMeasure(int, int)` methods.

Needless to say, this is one convoluted code snippet. What's happening is that we're measuring how much space we must put between `title` and `roomId` to get the desired alignment. The code is straight-forward (though cringe-worthy), so no comments have been included.

On the other hand, you could extend RelativeLayout:

public class ScheduleItemAlternateView extends RelativeLayout {

    private ScheduleItem mItem;  

    public ScheduleItemAlternateView(Context context, ScheduleItem item) {
        super(context);

        mItem = item;

        int textColor = Color.WHITE;
        int accentColor = item.accentColor;

        LayerDrawable buttonDrawable = (LayerDrawable) context.getResources()
            .getDrawable(R.drawable.btn_block);
        buttonDrawable.getDrawable(0).setColorFilter(accentColor,
            PorterDuff.Mode.SRC_ATOP);
        buttonDrawable.getDrawable(1).setAlpha(item.containsStarred ? 255 : 0);

        // Three TextViews to hold the `title`, `roomId`
        // and `teacher&room` independently
        TextView tvTitle = new TextView(context);
        TextView tvRoomId = new TextView(context);
        TextView tvTeacherAndClasses = new TextView(context);

        // Example ids
        tvTitle.setId(100);
        tvRoomId.setId(101);
        tvTeacherAndClasses.setId(102);

        tvTitle.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources()
            .getDimensionPixelSize(R.dimen.text_size_small));
        tvRoomId.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources()
            .getDimensionPixelSize(R.dimen.text_size_small));
        tvTeacherAndClasses.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources()
            .getDimensionPixelSize(R.dimen.text_size_small));

        tvTitle.setPadding(30, 20, 30, 0);
        tvRoomId.setPadding(30, 20, 30, 0);
        tvTeacherAndClasses.setPadding(30, 5, 30, 20);

        tvTitle.setTextColor(textColor);
        tvRoomId.setTextColor(textColor);
        tvTeacherAndClasses.setTextColor(textColor);

        // Set text
        tvTitle.setText(item.title);        
        tvRoomId.setText(item.roomId);      
        tvTeacherAndClasses.setText(item.teacher + " " + item.classes);

        // LayoutParms
        RelativeLayout.LayoutParams paramsTitle = 
                                 new RelativeLayout.LayoutParams(
                                     RelativeLayout.LayoutParams.WRAP_CONTENT,
                                     RelativeLayout.LayoutParams.WRAP_CONTENT);

        paramsTitle.addRule(RelativeLayout.ALIGN_LEFT, 
                                                  tvTeacherAndClasses.getId());

        RelativeLayout.LayoutParams paramsRoomId = 
                                 new RelativeLayout.LayoutParams(
                                     RelativeLayout.LayoutParams.WRAP_CONTENT,
                                     RelativeLayout.LayoutParams.WRAP_CONTENT);

        paramsRoomId.addRule(RelativeLayout.ALIGN_RIGHT, 
                                                  tvTeacherAndClasses.getId());

        RelativeLayout.LayoutParams paramsTeacherAndClasses = 
                                 new RelativeLayout.LayoutParams(
                                     RelativeLayout.LayoutParams.WRAP_CONTENT,
                                     RelativeLayout.LayoutParams.WRAP_CONTENT);

        paramsTeacherAndClasses.addRule(RelativeLayout.CENTER_HORIZONTAL);
        paramsTeacherAndClasses.addRule(RelativeLayout.BELOW, tvTitle.getId());

        // Add Views to this RelativeLayout
        addView(tvTitle, paramsTitle);
        addView(tvRoomId, paramsRoomId);
        addView(tvTeacherAndClasses, paramsTeacherAndClasses);

        // Set the background as LayerDrawable
        setBackgroundDrawable(buttonDrawable);          
    }
}

Here, we create three TextViews, and set their LayoutParams to get proper alignment.

Output is the same for both, though I would recommend the second approach:

Problem

Original source

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