VerticalTextView.java

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Region.Op;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.TextView;

public class VerticalTextView extends TextView {
    final boolean topDown;

    public VerticalTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        int gravity = this.getGravity();
        if(Gravity.isVertical(gravity) && (gravity & 112) == 80) {
            this.setGravity(gravity & 7 | 48);
            this.topDown = false;
        } else {
            this.topDown = true;
        }

    }

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(heightMeasureSpec, widthMeasureSpec);
        this.setMeasuredDimension(this.getMeasuredHeight(), this.getMeasuredWidth());
    }

    protected boolean setFrame(int l, int t, int r, int b) {
        return super.setFrame(l, t, l + (b - t), t + (r - l));
    }

    public void draw(Canvas canvas) {
        if(this.topDown) {
            canvas.translate((float)this.getHeight(), 0.0F);
            canvas.rotate(90.0F);
        } else {
            canvas.translate(0.0F, (float)this.getWidth());
            canvas.rotate(-90.0F);
        }

        canvas.clipRect(0.0F, 0.0F, (float)this.getWidth(), (float)this.getHeight(), Op.REPLACE);
        super.draw(canvas);
    }
}