Updated on 2026-08-14

app/src/main/java/com/tangem/util/DecimalDigitsInputFilter.java

@@ -0,0 +1,55 @@
+package com.tangem.util;
+
+import android.text.InputFilter;
+import android.text.Spanned;
+
+public class DecimalDigitsInputFilter implements InputFilter {
+    private final int decimalDigits;
+
+    /**
+     * Constructor.
+     *
+     * @param decimalDigits maximum decimal digits
+     */
+    public DecimalDigitsInputFilter(int decimalDigits) {
+        this.decimalDigits = decimalDigits;
+    }
+
+    @Override
+    public CharSequence filter(CharSequence source,
+                               int start,
+                               int end,
+                               Spanned dest,
+                               int dstart,
+                               int dend) {
+
+
+        int dotPos = -1;
+        int len = dest.length();
+        for (int i = 0; i < len; i++) {
+            char c = dest.charAt(i);
+            if (c == '.' || c == ',') {
+                dotPos = i;
+                break;
+            }
+        }
+        if (dotPos >= 0) {
+
+            // protects against many dots
+            if (source.equals(".") || source.equals(","))
+            {
+                return "";
+            }
+            // if the text is entered before the dot
+            if (dend <= dotPos) {
+                return null;
+            }
+            if (len - dotPos > decimalDigits) {
+                return "";
+            }
+        }
+
+        return null;
+    }
+
+}

app/src/main/java/com/tangem/util/VerticalTextView.java

@@ -0,0 +1,52 @@
+package com.tangem.util;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.support.v7.widget.AppCompatTextView;
+import android.text.TextPaint;
+import android.util.AttributeSet;
+import android.view.Gravity;
+
+public class VerticalTextView extends AppCompatTextView {
+    final boolean topDown;
+
+    public VerticalTextView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        final int gravity = getGravity();
+        if (Gravity.isVertical(gravity) && (gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {
+            setGravity((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);
+            topDown = false;
+        } else {
+            topDown = true;
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(heightMeasureSpec, widthMeasureSpec);
+        setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        TextPaint textPaint = getPaint();
+        textPaint.setColor(getCurrentTextColor());
+        textPaint.drawableState = getDrawableState();
+
+        canvas.save();
+
+        if (topDown) {
+            canvas.translate(getWidth(), 0);
+            canvas.rotate(90);
+        } else {
+            canvas.translate(0, getHeight());
+            canvas.rotate(-90);
+        }
+
+        canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
+
+        getLayout().draw(canvas);
+        canvas.restore();
+    }
+
+}