How to make android widget layout responsive

Question

I am building a widget for my Android application that will have several buttons on it. Based on the size of the widget, I want the amount of buttons on the widget to grow and s

Answer 1

Like they already said. You can use onAppWidgetOptionsChanged

So my proposition is to

1) Make different layouts. With 3 and 4 buttons.

2) Change the layout base on widget column count.

@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public void onAppWidgetOptionsChanged(Context context, AppWidgetManager appWidgetManager, int appWidgetId, Bundle newOptions) {

    // See the dimensions and
    Bundle options = appWidgetManager.getAppWidgetOptions(appWidgetId);

    // Get min width and height.
    int minWidth = options.getInt(AppWidgetManager.OPTION_APPWIDGET_MIN_WIDTH);
    int minHeight = options.getInt(AppWidgetManager.OPTION_APPWIDGET_MIN_HEIGHT);

    // Obtain appropriate widget and update it.
    appWidgetManager.updateAppWidget(appWidgetId, getRemoteViews(context, minWidth, minHeight));
    super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId, newOptions);
}

/**
 * Determine appropriate view based on row or column provided.
 *
 * @param minWidth
 * @param minHeight
 * @return
 */
private RemoteViews getRemoteViews(Context context, int minWidth, int minHeight) {
    // First find out rows and columns based on width provided.
    int rows = getCellsForSize(minHeight);
    int columns = getCellsForSize(minWidth);
    // Now you changing layout base on you column count 
    // In this code from 1 column to 4
    // you can make code for more columns on your own.
    switch (columns) {
        case 1:  return new RemoteViews(context.getPackageName(), R.layout.activity_layout_widget_1column);
        case 2:  return new RemoteViews(context.getPackageName(), R.layout.activity_layout_widget_2column);
        case 3:  return new RemoteViews(context.getPackageName(), R.layout.activity_layout_widget_3column);
        case 4:  return new RemoteViews(context.getPackageName(), R.layout.activity_layout_widget_4column);
        default: return new RemoteViews(context.getPackageName(), R.layout.activity_layout_widget_4column);
    }
}

/**
 * Returns number of cells needed for given size of the widget.
 *
 * @param size Widget size in dp.
 * @return Size in number of cells.
 */
private static int getCellsForSize(int size) {
    int n = 2;
    while (70 * n - 30 < size) {
        ++n;
    }
    return n - 1;
}