public class RotateTextView extends AppCompatTextView {
    private static final int DEFAULT_DEGREES = 0;

    private int mDegrees;

    public RotateTextView(Context context) {
        super(context, null);
    }

    public RotateTextView(Context context, AttributeSet attrs) {
        super(context, attrs, android.R.attr.textViewStyle);

        this.setGravity(Gravity.CENTER);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RotateTextView);

        mDegrees = a.getDimensionPixelSize(R.styleable.RotateTextView_degree, DEFAULT_DEGREES);

        a.recycle();
    }

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

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.save();
        canvas.translate(-27,25);
        canvas.rotate(mDegrees);
        super.onDraw(canvas);
        canvas.restore();
    }

    public void setDegrees(int degrees) {
        mDegrees = degrees;
    }
}

<com.h3c.classboard.teacher.RotateTextView
    android:id="@+id/info"
    android:layout_width="72dp"
    android:layout_height="72dp"
    android:gravity="center"
    android:text="哈 哈"
    android:textColor="@color/colorWhite"
    android:textSize="@dimen/font14"
    app:degree="-46dp" />